Polycarbonate-polybutylene

Hamilton, D. G. and Gallucci, R. R., The effects of molecular weight on polycarbonate-polybutylene terephthalate blends, J. Appl. Polym. Sci., 48, 2249-2252 (1993). 

The leading materials, in terms of market volume, are nylon, polycarbonate, polybutylene terephthalate, polyphenylene ether, poly-oxymethylene, and polyethylene terephthalate. 

Figure 1. UV absorption spectrum of Polycarbonate, Polybutylene terephtalate...

At temperatures above the melting point, water reacts rapidly with certain polymers such as nylon, polycarbonate, polybutylene tereph-thalate (PBT), and polyethylene terephthalate (PET). This reaction results in a decrease in the molecular weight. At the same time, absorbed water can form steam that results in surface roughness, splay, and internal bubbles. The reaction between water and the molten polymer is accelerated by prolonged exposure to temperatures above the melting point. 

TPUs and polycarbonate blends and TPU/polycarbonate/ABS blends are used with the addition of the polycarbonate giving higher modulus and solvent stress cracking resistance as well as making processing of the TPU much easier. TPU/polycarbonate/polybutylene terephthalate blends are superior to their ABS analogue for resistance to environmental stresscracking resistance. 

A Figure 12.16 This experimental car has body panels that are made of a polycarbonate-polybutylene plastic. 

Polyether ether ketone Polyoxyethylene polyacetal Polycarbonate Polybutylene terephthalate Polyamide 6 Polyamide 6,6 Polyamide 6,10 Polyamide 6,12 Polyphenylene sulfide Polysulfone... 

Such improvement cannot, however, be taken for granted. No improvement in fire retardancy characteristics was observed when a wide range of filler/reinforcing agents were incorporated into non-fire retardant polycarbonate, polybutylene terephthalate, polyethylene terephthalate, polyamide 6,6, or styrene acrylonitrile copolymer. 

Thanks to their unusual miscibility polymer blends of polyphenylene oxide and polystyrene were the first commercially successful amorphous engineering thermoplastics blends, introduced back, in 1968 Pete Juliauo of GE Corporate Research Laboratories presented a comprehensive review at the last lUPAC Meeting of The Rague(l) where he showed how the evolution of science and technology of blends (2,3) based on polyphenylene oxide, blsphenol A polycarbonate, polybutylene teraphthalate, polyamides and polyacetals, created many more opportunities for the development of engineering thermoplastics with attractive combination of attributes. 

FI6. 2. Dynamic liechanlcal Properties of Polycarbonate/Polybutylene Terephthalate Blends. 

The choice of substrate can impact the chemical and etch resistance of a coated plastic part. Thin layers of paint (especially when thin) can be influenced by the hardness of the substrate. However, this does not generally impact the chemical resistance of clear-coated parts as measured in testing such as Jacksonville. Substrates that are sensitive to solvents such as acrylonitrile butadiene styrene (ABS) and polycarbonate/polybutylene terephthalate (PC/PBT) can be rapidly or slowly degraded when attacked with certain solvents or even basic materials. 

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