서지주요정보
폴리우레탄의 반응 압출공정에 관한 연구 = Reactive extrusion process of polyurethane
서명 / 저자 폴리우레탄의 반응 압출공정에 관한 연구 = Reactive extrusion process of polyurethane / 현명억.
저자명 현명억 ; Hyun, Myung-Eok
발행사항 [서울 : 한국과학기술원, 1987].
Online Access 제한공개(로그인 후 원문보기 가능)원문

소장정보

등록번호

4104697

소장위치/청구기호

학술문화관(문화관) 보존서고

DCE 8716

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

An engineering analysis of the reactive extrusion process of a thermoplastic polyurethane was made through numerical simulation. The reactants used in this system were 4,4'-diphenylmethane diisocyanate, polycaprolactone diol (M.W.; 824) and 1,4-butanediol with equivalent weight ratio of 2:1:1. As a catalyst, dibutyltin dilaurate was used. The reaction kinetics and the viscosity function were obtained through experiments and the mathematical model which includes the conservation equations of mass, momentum, energy and chemical species was solved numerically to obtain the velocity, concentration, temperature, viscosity and pressure profiles. The conservation equations were solved numerically by the two different algorithms and the differences between the two methods were discussed. One of the above algorithms is to use the concept of residence times in an extruder channel and the other is to use the concept of average history of the particles with different flow paths in the channel. The importance of the shear rate dependence of viscosity in the reactive extrusion process was discussed, especially at high conversion. The effects of the operating parameters, such as the catalyst concentration, flow rate, screw speed, screw temperature, barrel temperature and channel depth, on conversion profiles were investigated to obtain reasonably uniform distribution of the conversion (or molecular weight) across the channel. The actual experiments were performed to compare the experimental results with those of the numerical simulation. The flow rate, screw speed and barrel temperature were selected as the operating An engineering analysis of the reactive extrusion process of a thermoplastic polyurethane was made through numerical simulation. The reactants used in this system were 4,4'-diphenylmethane diisocyanate, polycaprolactone diol (M.W.; 824) and 1,4-butanediol with equivalent weight ratio of 2:1:1. As a catalyst, dibutyltin dilaurate was used. The reaction kinetics and the viscosity function were obtained through experiments and the mathematical model which includes the conservation equations of mass, momentum, energy and chemical species was solved numerically to obtain the velocity, concentration, temperature, viscosity and pressure profiles. The conservation equations were solved numerically by the two different algorithms and the differences between the two methods were discussed. One of the above algorithms is to use the concept of residence times in an extruder channel and the other is to use the concept of average history of the particles with different flow paths in the channel. The importance of the shear rate dependence of viscosity in the reactive extrusion process was discussed, especially at high conversion. The effects of the operating parameters, such as the catalyst concentration, flow rate, screw speed, screw temperature, barrel temperature and channel depth, on conversion profiles were investigated to obtain reasonably uniform distribution of the conversion (or molecular weight) across the channel. The actual experiments were performed to compare the experimental results with those of the numerical simulation. The flow rate, screw speed and barrel temperature were selected as the operating parameters. In the experimental work, maximum run time was measured for the steady operation.parameters. In the experimental work, maximum run time was measured for the steady operation.

서지기타정보

서지기타정보
청구기호 {DCE 8716
형태사항 xvii, 135 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : Ⅰ, ü류시간의 계산. - Ⅱ, 전단율의 계산. - Ⅲ, 컴퓨터 프로그램
저자명의 영문표기 : Myung-Eok Hyun
지도교수의 한글표기 : 김성철
지도교수의 영문표기 : Sung-Chul Kim
학위논문 학위논문(박사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 108-111
주제 Catalysts.
Extrusion process.
수치 해법. --과학기술용어시소러스
촉매. --과학기술용어시소러스
압출. --과학기술용어시소러스
Numerical analysis.
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