서지주요정보
고압하에서의 폴리우레탄의 반응속도에 관한 연구 = A study on the kinetics of polyurethane polymerization under pressure
서명 / 저자 고압하에서의 폴리우레탄의 반응속도에 관한 연구 = A study on the kinetics of polyurethane polymerization under pressure / 박강주.
저자명 박강주 ; Park, Kang-Choo
발행사항 [서울 : 한국과학기술원, 1987].
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소장정보

등록번호

4104621

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 8712

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초록정보

The bulk polymerization reaction of isocyanate terminated polyurethane prepolymer and 1,4-butanediol under high pressure were analyzed in the temperature range between 30 and 80℃ and at pressure up to 3000 atm. The isocyanate terminated polyurethane prepolymer was prepared by reacting 1 equiv. of the poly(tetramethylene ether)glycol with 2 equiv. of 4,4-diphenylmethane dilsocyanate at 55℃. The conversion of the reaction was determined by titrating the residual isocyanate group with time. Molecular weight distribution of the polyurethanes synthesized under different conditions were analyzed by the gel permeation chromatography. Phase separation of the soft segment and the hard segment of the polyurethane was studied by measuring the dynamic mechanical properties of the soft segment and the melting behavior of the hard segment by DMA and DSC. The polymerization rate increased with increasing synthesis pressure. The frequency factor in the reaction equation increased exponentially with synthesis pressure, but the activation energy was not particularly affected. As the synthesis pressure was increased, tan δ increased and the soft segment Tg was shifted toward high temperature, and the hard segment Tm was shifted toward lower temperature. Therefore the phase separation of the soft segment and the hard segment was somewhat suppressed with increasing synthesis pressure due to the reduction of the chain mobility during the polymerization and the phase separation process. Molecular weight and molecular weight distribution were not influenced by the synthesis pressure.

서지기타정보

서지기타정보
청구기호 {MCE 8712
형태사항 iii, 52 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Kang-Choo Park
지도교수의 한글표기 : 김성철
지도교수의 영문표기 : Sung-Chul Kim
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 51-52
주제 Phase transmission (Statistical physics)
중합. --과학기술용어시소러스
상전이. --과학기술용어시소러스
Polymerization.
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