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Indexed by:期刊论文

Date of Publication:2015-01-01

Journal:RSC ADVANCES

Included Journals:SCIE、EI、Scopus

Volume:5

Issue:53

Page Number:42777-42788

ISSN No.:2046-2069

Abstract:A series of long chain aliphatic copolyesters poly(decamethylene sebacate-co-isosorbide sebacate) (P(DS-co- IS)) were synthesized from commercially available biobased sebacic acid (SA), 1,10-decanediol (DD) and isosorbide (ISB) through a two-step melt polycondensation method. The molecular weight, composition, and microstructure of the P(DS-co-IS) copolyesters were characterized by GPC, H-1-NMR, and C-13-NMR. The crystallization properties of the P(DS-co-IS) copolyesters were depressed, while the glass transition temperature was enhanced by the incorporation of isosorbide with a bulky rigid structure. The nonisothermal melt crystallization peak temperature and melting point decreased for P(DS-co-IS) with increasing the number of ISB unit; moreover, the equilibrium melting point temperature of P(DS-co-IS) was also reduced. However, the introduction of the ISB segment did not change the crystal structure of P(DS-co-IS), but it gradually decreases the crystallinity. Isothermal crystallization kinetics of neat PDS and its copolyesters indicated that PDS possesses high crystallization ability, which is a characteristic of long chain aliphatic polyesters. The crystallization mechanism remains unchanged for both neat PDS and P(DS-co-IS); however, the crystallization rates of P(DS-co-IS) decreased with increasing ISB composition and crystallization temperature. No evidence of ring-banded spherulites could be detected for this long chain PDS and its copolyesters in a wide temperature range even when supercooled.