期刊
POLYMER CHEMISTRY
卷 3, 期 5, 页码 1344-1353出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2py20068f
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资金
- Specialized Research Fund for the Doctoral Program of Higher Education [20110181130008]
- Program of International S T Cooperation [2011DFA51420]
- Program for Changjiang Scholars and Innovative Research Teams in University of China [IRT 1026]
- National Natural Science Foundation of China [51121001]
A series of poly(butylene terephthalate)-poly(butylene succinate) (PBT-PBS) copolyesters were synthesized by the melt chain-extension reaction of dihydroxyl terminated PBT (HO-PBT-OH) and PBS (HO-PBS-OH) prepolymers using toluene-2,4-diisoyanate (TDI) as a chain extender. Transesterification between PBT and PBS during the chain-extension reaction has been investigated in detail. Both random and block PBT-PBS copolymers can be synthesized by changing the prepolymers' molecular weights at a given reaction time and temperature. The chemical structures and sequence distributions of the copolyesters were analyzed by proton nuclear magnetic resonance (H-1-NMR) spectroscopy. The thermal transition behaviours of copolyesters with different sequence distribution were characterized by differential scanning calorimeter (DSC). The number-average molecular weight (M-n) of HO-PBT-OH played a dominant role in the sequence distribution of the resulting copolyesters. The degree of randomness of the copolymer was around 1 when M-n of HO-PBT-OH was 5000 g mol(-1) regardless of that of HO-PBS-OH, it decreased to less than 1 when M-n of HO-PBT-OH was more than 10 000 g mol(-1), and it gradually decreased with the increase in M-n of HO-PBS-OH. The copolyesters with different degrees of randomness showed different thermal transition and crystallization behaviours.
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