화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.22, No.4, 559-569, July, 1998
Export Citation
PBS-PTMG Segmented Block Copolymer의 합성 및 분석
Synthesis and Characterization of PBS-PTMG Segmented Block Copolymer
박영효, 조창기
초록
Poly(butylene succinate)(PBS)와 poly(tetramethylene glycol)(PTMG, Mn=2000)을 공중합하여 polyester-polyether segmented block copolymer를 합성하고 조성에 따른 열적 거동과 기계적 성질을 알아보았다. PBS 단일중합체의 융점은 115.2 ℃였으나 70 wt%의 PTMG가 공중합되면 융점이 83.0 ℃까지 내려감을 알 수 있었다. 시차주사열량계(DSC)로 측정된 ΔHf(heat of fusion)에서 구한 결정화도는 소프트세그먼트가 5∼21 %, 하드세그먼트가 53∼67 %정도의 값을 보였다. PBS 단일중합체의 절단강도는 37.3 MPa이었으나 PTMG가 첨가됨에 따라 점차 감소하여 PTMG함량이 70 wt%인 공중합물의 경우 24.0 MPa로 약 1/3정도가 감소하였다. 이에 비해 절단신도는 PBS 단일중합체가 100 %, 이 후 PTMG함량 증가에 따라 증가하여 PTMG함량이 70 wt%인 공중합물이 800 %로써 약 8배로 신도가 향상되었다. 일정 연신율로 연신시킨 후의 복원율에서는 PTMG 함량 40 wt% 공중합물에 비해 PTMG 함량이 70 wt%인 공중합물의 복원율이 약 2배 정도 증가하였다.
Polyester-polyether segmented block copolymers of poly(butylene succinate) (PBS) and poly(tetramethylene glycol) (PTMG, Mn = 2000) with various compositions were synthesized. Their thermal and mechanical properties were investigated. The melting point of PBS control was 115.2 ℃ and the melting point of the copolymer containing 70 wt% of PTMG was 83.0 ℃. Crystallinity of soft segment was 5∼21% and that of hard segment was 53∼67%. Breaking stress of PBS control was 37.3 MPa but decreased with increasing PTMG content. In the case of the copolymer containing 70 wt% of PTMG, breaking stress was 24.0 MPa. Contrary to the decreasing breaking stress, breaking strain increased from 100% for PBS control to 800% for the copolymer containing 70 wt% of PTMG. The shape recovery ratio of the copolymer containing 70 wt% PTMG was almost twice of that of the copolymer containing 40 wt% PTMG.
Keywords:Poly(butylene succinate);Poly(tetramethylene glycol);Polyester-polyether segmented block copolymer;Shape recovery
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