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Luminaires
Published in J. R. Coaton, A. M. Marsden, Lamps and Lighting, 2012
Polybutylene terephthalate (PBT) is the thermoplastic equivalent of SMC and DMC with virtually the same temperature capability. The large number of compact fluorescent light sources being introduced have taken advantage of this material for lamp caps and shrouds. It is also extensively used to manufacture the small bodies for spotlights and decorative indoor lights. It is always used glass-filled usually with 10–30 per cent glass fibre content to give the required heat distortion performance. Flame-retardant grades are available and UV stability is reasonable. The main advantage of PBT over SMC and DMC is in its processability.
Effect of IR laser radiation on the structure and optical properties of PC-PBT/Pd polymer nanocomposite films
Published in Radiation Effects and Defects in Solids, 2019
S. A. Nouh, K. Benthami, M. ME. Barakat
The synthesis and characterization of nanocomposite materials is a rapidly evolving area of research. The variety of applications for these materials is extremely diverse (1). Advancement in thin film processing of polymeric materials is essential in electronic, optical and packaging industries (2). Polycarbonates (PC) are used in many applications because of their distinguished properties as excellent toughness, high rigidity and good heat resistance. Also, it has a low resistance to organic compounds (3). On the other hand, polybutylene terephthalate (PBT) possesses a very high resistance to organic chemicals because they are semi-crystalline. These materials are also stiff and can be hold up to high temperatures. The crystallinity of PBT leads them to be of high specific gravity as well as high shrinkage values (4). Bayfol is a polymeric solid-state nuclear track detector that has benefits over standard polycarbonate films. It is a thermoplastic alloy of amorphous polycarbonate and semi-crystalline polybutylene terephthalate (PC-PBT) (5). Blends of polycarbonate and polybutylene terephthalate PBT are an important class of commercial blends with numerous applications providing good chemical resistance, impact resistance even at low temperatures and improved flow characteristics as compared with the neat polymers (6). Devaux et al. (6) have postulated transesterification to be the most important exchange reaction occurring between PC and PBT, resulting in a new chemical structure of copolymers. Besides, nanostructure materials attracted a huge payment of awareness as a result of their prospective for improving specific properties. The newly accessible nanostructure materials and nanotechnological tools can facilitate the production of new polymers, as well as a composite between polymers and inorganic materials to produce higher quality membranes with improved sensitivity and selectivity (7). The merging of metal nanoparticles in the polymer matrix will improve its physical properties so that the obtained nanocomposite will be suitable for different applications (8–10).