Hits:

Indexed by:期刊论文

Date of Publication:2010-07-01

Journal:POLYMER BULLETIN

Included Journals:SCIE、EI

Volume:65

Issue:3

Page Number:201-213

ISSN No.:0170-0839

Key Words:Symmetrical triblock copolymers; High-trans-1,4-Polybutadiene; Cold crystallization; Styrene; Isoprene

Abstract:A series of symmetrical triblock copolymers containing crystallizable high-trans-1,4-polybutadiene (HTPB) were synthesized by sequential anionic polymerization of 1,3-butadiene (Bd) with isoprene (Ip) (or styrene (St)) using barium salt of di(ethylene glycol) ethyl ether/triisobutylaluminium/dilithium (BaDEGEE/TIBA/DLi) as initiation system. The microstructures of the symmetrical triblock copolymers were determined by IR, (1)H NMR, and (13)C NMR. The results indicated that polyisoprene-block-high-trans-1,4-polybutadiene-block-polyisoprene (IBI) contained HTPB segments and medium 3,4-polyisoprene (PI) segments, and polystyrene-block-HTPB-block-polystrene (SBS) contained HTPB and atatic-polystyrene (PS) segments. The DSC analysis revealed that SBS tended to phase separate but IBI did not. The cold crystallization was observed in IBI but not in SBS.