Polyfbutylene terephthalate PBT

Figure 35 Example of random degradation mechanism thermolysis mechanism of polyfbutylene terephthalate) (PBT).

Shelgaev and co-workers [60] found that increased thermal stability could be achieved by synthesising polyfbutylene terephthalate) (PBT) in the presence of a stabiliser package which included tris(nonylphenyl)phosphite and sodium hypophosphite. 

Volex 410 Polyfbutylene terephthalate), PBT glass/mineral Comalloy Inti. Corp. 

H. J. Ludwig and R Eyerer, Influence of the processing conditions on morphology and deformation behavior of polyfbutylene terephthalate) (PBT), Polym. Eng. Sci., 28 143-146,1988. 

Kim and Robertson [203] studied the toughening of an aromatic amine-cured diglycidyl ether of bisphenol A epoxy with particles of crystalline polymers. The crystalline polymers chosen were polyfbutylene terephthalate) (PBT), nylon-6, and polyCvinylidene fluoride) (PVDF). Each of these was found to be capable of un-... 

The above-mentioned results of the SSP of PET can be generally applied to other semicrystalline polyesters, such as polyfbutylene terephtlialate) (PBT), polyftri-metliylene terephthalate) PTT), polyfethylene naphtlialate) (PEN) or any other kind of semicrystalline co-polyester, as a result of their similar reaction behaviors. Most of the studies have been focused on PET and PBT due to tlieir industrial importance. Meanwhile, the popularity of PEN is growing on account of the outstanding properties of this particular polymer. 

An interesting finding is that the sequence length distribution has an impact on the biodegradability properties of TPEEs. In an analysis of structure of aliphatic/aromatic TPEEs, based on PBT and aliphatic polyfbutylene adipate) (PBA), studied by high resolution NMR, it was found that 35-55 mol % of terephthalic acid in TPEEs was suitable from the point of view of biodegradability and mechanical and physical properties [27,28]. 

Aromatic polyesters, such as PET, PBT or PEN, are not degradable in the presence of microorganisms, while their copolyesters with aliphatic acids show some extent of biodegradability [28,81,82]. It was reported that copolyesters based on PBT and polyfbutylene adipate) (PBA) with about 35-55 mol % of terephthalic acid residues exhibited suitable mechanical and physical properties, as well as favorable biodegradability (film approx. 100 pm degradation within 8-12 weeks in soil or compost). Beside copolymerization, the biodegradable properties of polyesters can be improved by increasing the hydrophilicity, for instance by the introduction of... 

---