Search results
1 – 4 of 4Lijun Qiao, Allan J. Easteal, Clive J. Bolt, Philip K. Coveny and Robert A. Franich
Four different approaches were taken to improve the water resistance of poly(vinyl acetate) (PVAc) emulsion adhesives. The improved wood adhesives were tested according to the ISO…
Abstract
Four different approaches were taken to improve the water resistance of poly(vinyl acetate) (PVAc) emulsion adhesives. The improved wood adhesives were tested according to the ISO 9020 standard. Tensile storage modulus (E’) and glass transition temperature of the polymer films were measured using dynamic mechanical thermal analysis to quantify the influence of different approaches on those variables. Gel fraction and swelling ratio of the polymer film were measured to evaluate internal crosslink density. The experimental results showed that blending melamine/urea/formaldehyde (MUF) resin with PVAc emulsions modified the water resistance considerably and the film had a high E’ since an interpenetrating network‐type structure was formed in the polymer. The advantages and limitations of each modification were assessed on the basis of comparison of the results.
Details
Keywords
Lijun Qiao, Allan J. Easteal, Clive J. Bolt, Philip K. Coveny and Robert A. Franich
Fillers with different chemical properties were used to study their effects on poly(vinyl acetate) (PVAc) emulsion wood adhesives. The elastoplastic behaviour of the filler…
Abstract
Fillers with different chemical properties were used to study their effects on poly(vinyl acetate) (PVAc) emulsion wood adhesives. The elastoplastic behaviour of the filler treated PVAc emulsions was studied using differential scanning calorimetry and dynamic mechanical thermal analysis. The results show that the glass transition temperature (Tg) of the polymer is not changed significantly by the addition of the fillers, while the tensile modulus is changed together with the hardness and stiffness. The viscosity of the emulsions and their performance on wood surfaces are greatly affected by fillers. Fillers with high oil‐absorption capacity increase viscosity to a greater extent. The acidity of the fillers influences the setting time for bonding of the emulsions to wood, and the water resistance, since some chemical reactions can take place during curing.
Lijun Qiao, Allan J. Easteal, Clive J. Bolt, Philip K. Coveny and Robert A. Franich
Poly (vinyl acetate)‐based emulsion polymer/isocyanates (EPI) structural wood adhesives were prepared and their performance benchmark tested according to the specifications of the…
Abstract
Poly (vinyl acetate)‐based emulsion polymer/isocyanates (EPI) structural wood adhesives were prepared and their performance benchmark tested according to the specifications of the Japanese JAS‐111 standard. The changes of the glass transition temperature of the cured emulsions relative to unmodified poly(vinyl acetate) emulsion, measured using differential scanning calorimetry, indicated the chemical structure changes resulting from modification of poly(vinyl acetate) emulsion. The EPI adhesives showed excellent water resistance and near‐colourless gluelines in wood joints, ease of application and additional significant advantages over other types of wood adhesives. The performance test results are interpreted on the basis of the viscoelastic behaviour of free‐standing adhesive films. Other types of crosslinkers were used in the study to compare with the isocyanate hardeners.
Details
Keywords
Action in the 1980s to a large extent belonged to the hard, hyper-masculine physiques of Arnold Schwarzenegger and Sylvester Stallone, who seemed to embody the aggressive…
Abstract
Action in the 1980s to a large extent belonged to the hard, hyper-masculine physiques of Arnold Schwarzenegger and Sylvester Stallone, who seemed to embody the aggressive, go-getting, testosterone-fuelled spirit of the age. Except, as this chapter argues, it would be a mistake to take these representations of masculinity at face value.
Susan Jeffords has noted the evolution of Schwarzenegger's Terminator character from hard-bodied killer to nurturing father figure, linking this to the change in perceptions of masculinity between the Reagan and Bush eras. Indeed, as Schwarzenegger moved into the 90s his films increasingly played with notions of ‘the feminine’ – from the nurturing Schwarzenegger of Kindergarten Cop (1990) to the ‘maternal’ Schwarzenegger of Junior (1994).
This chapter focuses on Schwarzenegger's Commando (1985), the first film in which he plays a contemporary, ‘normal’ (though still unusually muscular) man: a widowed ex-special forces commando and now full-time father, named John Matrix. The act of naming this supposed he-man ‘Womb’ is only the beginning of the film's surprising and subversive disquisitions on gender. In between (and sometimes during) the expertly staged fist fights, gun battles and explosions, homoeroticism, the male gaze and gender stereotyping all bubble away under the surface. Schwarzenegger's body is presented for scrutiny in a way previously reserved for female Hollywood stars, and the film's antagonist, an embittered former colleague who is obsessed with Matrix in a way that verges on the erotic, transcends butch and enters the realms of macho camp. The film questions and subverts presumptions about the masculine and the feminine, while still delivering an ostensibly macho, quintessentially 1980s action film.
Details