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- W2062948144 abstract "Abstract Summary: Analysis was made of the crystallization of the PET blocks in PET/PC copolymers as a function of the block length, varying from $overline M _{rm n}$ = 5300 to 17100 g · mol −1 ( X n PET = 28–89, PET monomeric sequences). Analysis was also made of a series of PET homopolymers with the same $overline M _{rm n}$ values. The copolymers were found to crystallize at a slower rate, with lower crystallinity and lower crystal perfection, than the homopolymers and secondary crystallization does not take place, unlike with PET homopolymers. However the crystallization mechanism is the same. The plot of the crystallization rate versus X n PET shows that the homopolymers have a maximum crystallization rate at X n PET ≅ 50 ( $overline M _{rm n}$ ≅ 10000 g · mol −1 ), whereas the crystallization rate for copolymers continuously increases with the increment of X n PET (see Figure). The decrement of the crystallization rate for homopolymers with $overline M _{rm n}$ higher than 10000 g · mol −1 has been interpreted as due to the effect of the high melt viscosity. For copolymers with long PET blocks, instead, a phase separation is likely and improves the PET reptation and fold, causing an increment in crystallization rate. Block size and miscibility between the components are therefore the key parameters in understanding the crystallization process in PET/PC block copolymers. magnified image" @default.
- W2062948144 created "2016-06-24" @default.
- W2062948144 creator A5047801425 @default.
- W2062948144 creator A5078916308 @default.
- W2062948144 date "2004-12-06" @default.
- W2062948144 modified "2023-10-17" @default.
- W2062948144 title "Crystallization of Poly(ethylene terephthalate) in Poly(ethylene terephthalate)/Bisphenol A Polycarbonate Block Copolymers: Influence of Block Length and Role of the Rubbery Amorphous Component" @default.
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- W2062948144 doi "https://doi.org/10.1002/macp.200400243" @default.
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