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Article
Publication date: 9 May 2019

Z.H.Z. Abidin, N.S.A. Manah, A.N. Hadi, N.S. Saugi, F.A. Fuad, N.A. Mazni, H.C. Hassan, M.A. Careem and A.K. Arof

This paper aims to focus on a comparison study of the visible stability of natural blue dye consisting anthocyanin molecules extracted from Clitoria ternatea in coating films.

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Abstract

Purpose

This paper aims to focus on a comparison study of the visible stability of natural blue dye consisting anthocyanin molecules extracted from Clitoria ternatea in coating films.

Design/methodology/approach

The coating films were prepared by mixing the blue dye with poly(acrylamide-co-acrylic acid) in three different weight ratios. Samples were coded as 10PBA, 15PBA and 20PBA, where PBA is the abbreviation for poly acrylamide-co-acrylic acid, blue dyes and anthocyanin. The number at the beginning of each code represents the weight percentage of poly(acrylamide-co-acrylic acid) to natural blue dye. The mixtures were applied on separate glass substrates to form coating films. Another set of samples were prepared for the comparison study with a commercial acrylic clear coat (cc) applied on the surface of the 10PBA, 15PBA and 20PBA coating films. These coating films were coded 10PBAcc, 15PBAcc and 20PBAcc. The purpose of the clear coat is to observe how it affects the colour stability of the blue coating films with respect to time. All samples were exposed to the ultraviolet (UV) source, an 18 W Philips TL-D 18w/830 UV fluorescent lamp. The UV lamp was placed 15 cm above the surface of the samples for 35 days. The colour of the coatings was measured using CIE L*a*b* colour space coordinate.

Findings

The results obtained show 10PBA and 10PBAcc have the highest colour stability after 35 days of exposure to UV light. The reflectivity of the coating films was also measured during exposure to UV lamp. Reflectivity measurements also showed that 10PBA and 10PBAcc coating films had the highest reflective stabilities.

Research limitations/implications

The potential of using natural blue dye consisting anthocyanin in coating film to obtain high colour stability.

Practical implications

The coating film developed in this work is suitable to be applied on glass substrates.

Originality/value

The application of anthocyanin dye extracted from the Clitoria ternatea L. as a colourant in coating films

Details

Pigment & Resin Technology, vol. 48 no. 4
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 18 October 2018

R. Usop, L. Sulaiman, N.A. Mazni, N.S.A. Manah, N. Anuar, A.K. Arof and Z.H.Z. Abidin

The purpose of this paper is to study the colour stability and water content resistivity of the green colour coating paint film (consisting of chlorophyll) during exposure to…

96

Abstract

Purpose

The purpose of this paper is to study the colour stability and water content resistivity of the green colour coating paint film (consisting of chlorophyll) during exposure to ultraviolet A (UV-A).

Design/methodology/approach

The natural green dye was prepared by immersing Cassia alata L. leaves in absolute ethanol. The extract was prepared in two batches of dye samples where one of it was a pure dye and the other was added with 3 Wt. % Cu(NO3)2 as an additive. Polymer blend as a binder was prepared by mixing poly(methyl methacrylate) (PMMA) and commercial acrylic polyol. The blended polymer was mixed with the natural dye in a specific ratio and applied as coating paint film on glass panel surfaces. The visible spectrum stability (colour stability) and water content resistivity of the coating paint films during exposure to UV-A were monitored.

Findings

Addition of Cu(NO3)2 had improved the colour stability of the coating paint film. Fourier transform infrared spectroscopy analysis showed that both coating paint films do not absorb water and are resistive to water content.

Research limitations/implications

The ability of Cu(NO3)2 as an colour stability additive to the natural green dye applied in the coating paint film.

Practical implications

The coating paint film developed in this work is suitable to be applied on glass substrates.

Originality/value

The colour stability of the coating paint film was analysed by using the reflectance spectrum.

Details

Pigment & Resin Technology, vol. 47 no. 6
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 18 November 2021

Shameer Hisham, Hairul Anuar Tajuddin, Norazilawati Muhamad Sarih, Nur Zarith Diana Diana Zakaria, Zul Hazrin Zainal Abidin and Norhana Abdul Halim

In this work, the blends of poly(methyl methacrylate), PMMA and poly(methyl vinyl ether-alt-maleic acid monoethyl ester), PMVEMA-ES are studied as organic coatings to evaluate the…

138

Abstract

Purpose

In this work, the blends of poly(methyl methacrylate), PMMA and poly(methyl vinyl ether-alt-maleic acid monoethyl ester), PMVEMA-ES are studied as organic coatings to evaluate the impact of intermolecular hydrogen bonding on the physical and thermal characteristics of the prepared coatings.

Design/methodology/approach

PMMA (Mw = 120,000 g mol-1) was chosen as our binder material. Due to the low adhesion property of PMMA on polar substrates, it was blended with PMVEMA-ES, which contains polar –COOH groups, to improve the adhesion and thermal properties of the coatings by forming intermolecular hydrogen bonds. A cross-hatch adhesion test was carried out to evaluate the adhesion strength of different ratios of PMMA/PMVEMA-ES blends as coatings. In addition, changes in the glass-transition temperature, Tg as the composition varies were studied using Differential Scanning Calorimetry, DSC. Then, glossiness and hiding power tests were also conducted to evaluate the physical properties of the prepared coatings.

Findings

Upon a closer look at the DSC results, it was found that blends consisting of 12.5, 25.0 and 87.5 wt. % PMMA were completely compatible due to the presence of only a single Tg in their thermograms. Other blend compositions showed two distinct Tgs, indicating partial compatibility. Furthermore, the addition of PMVEMA-ES caused the Tg of PMMA to shift to lower temperatures, a strong indication of intermolecular hydrogen bonding interactions between the two components. From the cross-hatch adhesion results, the addition of PMVEMA-ES improved the adhesion properties of PMMA coating, except for blends consisting of 62.5 and 75.0 wt. % PMMA possibly due to the partial incompatibility between the two components. These findings were further corroborated with the results of glossiness and hiding power measurements. The superior result was seen for the blend consisting of 12.5 wt. % PMMA with strong adhesion property, high glossiness, compatibility and high translucency.

Practical implications

PMVEMA-ES can potentially be used as an adhesion promoter in PMMA-based coating formulations.

Originality/value

This is the first report on the properties of PMMA/PMVEMA-ES blends as coatings.

Details

Pigment & Resin Technology, vol. 52 no. 1
Type: Research Article
ISSN: 0369-9420

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Book part
Publication date: 2 December 2016

Hanna Danilovich

This paper addresses a highly under-research question of employee voice in Belarus using labour process theory, specifically, Ramsay’s (1977) cycles of control theory to assess…

Abstract

This paper addresses a highly under-research question of employee voice in Belarus using labour process theory, specifically, Ramsay’s (1977) cycles of control theory to assess the evolution of voice at transitional periphery. Using the sample of 10 industrial enterprises, the paper explores the degree of management control over formal voice and the role of trade unions in defending of independent voice at the collective level. Informal voice at the individual level is also analysed. The findings demonstrate that the degree of direct control over formal voice in Belarus exceeds that in the Soviet Union due to suppression of independent trade union voice. The loss of workers’ control over the labour process has led to decreasing informal voice at the individual level. However, the earlier argument on workers’ patience is not supported due to a growing number of organised workers protests.

Details

Employee Voice in Emerging Economies
Type: Book
ISBN: 978-1-78635-240-8

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Book part
Publication date: 31 March 2015

Romain Bertrand

‘Javanese culture’ often is associated with ‘patrimonialism’ at its worst, that is, as a prelude to predation. Yet a closer look at some of the well-known court-centred serat

Abstract

‘Javanese culture’ often is associated with ‘patrimonialism’ at its worst, that is, as a prelude to predation. Yet a closer look at some of the well-known court-centred serat (mystical songs) and babad (chronicles) written in Central Java during the late 18th and the 19th centuries provide us with a very different picture. Pujangga (court-poets) crafted sophisticated imaginings of the negara: the State, or rather the domain of both moral and political authority. In territorial terms, they made a distinction between what the ruler could freely dispose of and what he could not alienate. Moreover, the very process of the imperial expansion of the negara under the reign of Sultan Agung (r. 1613–1646) led to the birth of a group of ‘government specialists’: the service nobility of the priyayi. This group held a view of legitimate authority running contrary to any despotic temptation: for the priyayi, exercising power was an art, a craft involving skills that had to be learnt, whereas for the para bangsawan (members of the blood nobility), power was something to be possessed by virtue of the fame of a family name. Yet, during the colonial period, Dutch Orientalists, colonial administrators and high-ranking Javanese Regents came to give a wholly distorted view of this old priyayi conception of power, turning it into the cultural alibi of imperial authoritarianism.

Details

Patrimonial Capitalism and Empire
Type: Book
ISBN: 978-1-78441-757-4

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Article
Publication date: 23 February 2022

Hendy Herijanto

This paper aims to find out the similarities and differences in meaning between the word “al amanah” and trust.

467

Abstract

Purpose

This paper aims to find out the similarities and differences in meaning between the word “al amanah” and trust.

Design/methodology/approach

As a qualitative research, a content analysis is used in three stages. First, to elaborate the exegesis of the related Qur’anic verses together with the background narration or asbab un-nuzul if any and the Prophetic hadith where the word amanah is and to analyse and conclude its meanings. Second, the word “trust” is analysed based on the discussions in the literature which will lead to its specific meanings. Third, the concluded meanings of amanah and trust are to be compared to find out their similarities and differences.

Findings

Amanah and trust have the similar meanings: safe, confident, ability to fulfil the expectation of the person who trust, having competence or expertise to perform duty, deliver commitments, keep promises, work with a full of responsibility, integrity or obedient to moral principles. Differences: Amanah is not only oriented to humanity and responsibility in human’s relations but also, more importantly, to God Allah the Almighty, obeying His commands to make it as ibadah or acts of worshipping Allah the Almighty for maslahah or welfare for society.

Practical implications

The findings are considered important for companies or organisations. Before doing a commercial transaction or entering a contract or hiring an employee, they must study the quality of the counterparty whether they are capable to do the job as expected or not. In addition, the findings indicate that Islamic teachings concerning muamalat or Islamic rules for social dealings is universal in nature.

Originality/value

Being the first time to compare the word al amanah to trust, the findings point out the important elements to be evaluated when assigning a certain duty to an agent.

Details

International Journal of Ethics and Systems, vol. 38 no. 4
Type: Research Article
ISSN: 2514-9369

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Book part
Publication date: 4 April 2005

Jairo Laser Procianoy and Luis Fernando Moreira

This paper examines stock prices reaction to open market repurchases announcements at the São Paulo Stock Exchange between May 30, 1997 and October 31, 1998. This institutional…

Abstract

This paper examines stock prices reaction to open market repurchases announcements at the São Paulo Stock Exchange between May 30, 1997 and October 31, 1998. This institutional scenario is a good testing ground for some theoretical hypotheses about stock repurchases announcements, because during this period there were taxes on capital gains but not on dividends. Using an event study methodology, we examined 110 episodes and found very small abnormal returns. Those results can not be explained by two main competing theoretical explanations. The Cumulative Abnormal Returns pattern found clearly suggests that repurchase announcements affected the behavior of stock prices in ways not described in previous studies.

Details

Latin American Financial Markets: Developments in Financial Innovations
Type: Book
ISBN: 978-1-84950-315-0

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Article
Publication date: 11 May 2012

Thuwayba Ahmad Al Barwani, Wajeha Thabit Al‐Ani and Ismail Hussein Amzat

The purpose of this paper is to investigate what is the most important characteristic that leads to effective teaching in the general education schools in Oman, as perceived by…

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Abstract

Purpose

The purpose of this paper is to investigate what is the most important characteristic that leads to effective teaching in the general education schools in Oman, as perceived by the students.

Design/methodology/approach

Methodologically, this research is a survey in nature, using questionnaires for data collection. The sample size consists of 2,628 students from the General Education Schools in most of the regions in Oman. To ensure the reliability and construct validity, this research has applied the principal component analysis (PCA) to determine whether the relevant items have been accordingly loaded on their respective construct. For data analysis, the confirmatory factor analysis (CFA) or the measurement model was employed to determine the indictors and factors as well as the predictor that can positively lead to effective teaching and teachers.

Findings

In terms of the findings, this research discovered that, the “community relationships” factor is the most important factor that leads to effective teaching and that it predicts an effective teacher in Oman. This indicates that to have effective teaching in Oman from the students' perspectives, the school must involve the society to participate and support the educational process, while an effective teacher should align his/her teaching service with society needs. Teaching strategies were found to be the second factor and predictor for teaching effectiveness.

Originality/value

This research is timely, as the Omani Ministry of Education is striving to achieve quality education. The study described in the paper is aligned with the Ministry's aims and objectives and will be of benefit to the Omani Ministry of education, educational policy‐makers and planners in terms of setting a standard for effective teaching and has provided a model to follow in becoming an effective teacher, according to General Education students in Oman. This paper has bridged gaps in the existing literature on providing characteristics for effective teaching and teachers in Oman. No other paper or research, based on researchers' best knowledge, has dealt with the issue of teaching effectiveness in Oman and presented criteria to follow in determining an effective teacher. Therefore, this research is unique and has taken a bold step to design a model which the Omani government can use as a standard for effective teaching and teachers in Oman.

Details

Education, Business and Society: Contemporary Middle Eastern Issues, vol. 5 no. 1
Type: Research Article
ISSN: 1753-7983

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Article
Publication date: 20 January 2020

Mastura Ab. Wahab and Tajul Ariffin Masron

Throughout the extant studies on Islamic work values, many variations in the concept of Islamic work values were found. This has created some confusions and misunderstandings on…

571

Abstract

Purpose

Throughout the extant studies on Islamic work values, many variations in the concept of Islamic work values were found. This has created some confusions and misunderstandings on what is the core of Islamic work values that is highly emphasized by Islam. The unanimity of Islamic work values is fundamental to Islamic organizations, and businesses in particular, as it indicates ethical, effectiveness and religious reputations of the organizations. This paper aims to identify the core Islamic work values based on Islamic legal texts (the Qur‘an and the Hadith as the two main Islamic sources), the writings of Islamic scholars and then to have experts verify whether or not the identified work values are core Islamic work values.

Design/methodology/approach

The paper used a qualitative approach where Islamic legal texts (the Qur’an and the Hadith) as well as the writing of Islamic scholars were used as a main reference to identify the core Islamic work values. These identified core Islamic work values were later verified by the muftīs. The verification assessment involved six muftīs from Malaysia.

Findings

The final result revealed that 14 core Islamic work values have been verified by the muftīs. These 14 considered core Islamic work values are essential work values of Islam which are important to achieve effective work performance.

Research limitations/implications

The findings presented are useful for managers and employees in Islamic organizations to decide on what Islamic work values that should be given more precedence and to be practised in their organizations.

Originality/value

This is a novel study that combines two approaches, the Islamic legal texts and muftīs verification regarding the work values obtained that can be accepted as the core Islamic work values. Therefore, these findings can be a guide for many future studies in the area of Islamic work values.

Details

Journal of Islamic Accounting and Business Research, vol. 11 no. 1
Type: Research Article
ISSN: 1759-0817

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