Department News
Microcelluar Foam Processing in Extrusion
Seminar Date
2000-06-22
Author
관리자
Date
2000-06-22
Views
919
1. 제 목 : Microcelluar Foam Processing in Extrusion
2. 연 사 : Prof. Chul Bum Park (Univ. of Toronto)
3. 일 시 : 2000년 3월 17일(금요일) 오후 1시
4. 장 소 : 301동 1512호
5. 내 용 :
tAn extrusion process for he manufacture of microcellular polymers is presented. Microcellular polymers are foamed plastics characterized by a cell-population density greater than 10E9 cells/cc and a fully grown cell size on the order of or less than 10 microns. Typically, microcellular plastics exhibit high impact strength (up to 5 fold increase over unfoamed plastic), high toughness (up to 5 fold increase over unfoamed plastic), high fatigue life (up to 15 fold increase over unfoamed plastic), high thermal stability, low dielectric constant, and low thermal conductivity. In order to produce microcellular polymers, the followingprocessing steps are closely controlled in extrusion processing: (a) to nucleate a large number of bubbles in the polymer matrix, (b) to prevent the coalescence of cells to preserve the obtained large cell density, (c) to promote volume expansion to a desired expansion ratio, (d) and to remove the melt fracture to achieve a high surface quality. The approaches and strategies for achieving these processing steps are described in detail. The purpose of this research is to develop a scientific and engineering basis needed to produce a uniformly distributed fine-cell structure with a high a volume expansion ratio using an environmentally safe blowing agent.
6. 연사 약력 :
1983년 서울대학교 기계공학과 학사
1985년 한국과학기술원 기계공학과 석사
1993 MIT, Mechanical Engineering, Ph.D.,
1993년 7월 - 현재 University of Toronto, 기계공학과 조교수, 부교수
2000년 1월 - 2000년 6월 서울대학교 기계설계학과 교환교수
7. 연락처 : 기계항공공학부 조영만 교수 (880 - 1694)
2. 연 사 : Prof. Chul Bum Park (Univ. of Toronto)
3. 일 시 : 2000년 3월 17일(금요일) 오후 1시
4. 장 소 : 301동 1512호
5. 내 용 :
tAn extrusion process for he manufacture of microcellular polymers is presented. Microcellular polymers are foamed plastics characterized by a cell-population density greater than 10E9 cells/cc and a fully grown cell size on the order of or less than 10 microns. Typically, microcellular plastics exhibit high impact strength (up to 5 fold increase over unfoamed plastic), high toughness (up to 5 fold increase over unfoamed plastic), high fatigue life (up to 15 fold increase over unfoamed plastic), high thermal stability, low dielectric constant, and low thermal conductivity. In order to produce microcellular polymers, the followingprocessing steps are closely controlled in extrusion processing: (a) to nucleate a large number of bubbles in the polymer matrix, (b) to prevent the coalescence of cells to preserve the obtained large cell density, (c) to promote volume expansion to a desired expansion ratio, (d) and to remove the melt fracture to achieve a high surface quality. The approaches and strategies for achieving these processing steps are described in detail. The purpose of this research is to develop a scientific and engineering basis needed to produce a uniformly distributed fine-cell structure with a high a volume expansion ratio using an environmentally safe blowing agent.
6. 연사 약력 :
1983년 서울대학교 기계공학과 학사
1985년 한국과학기술원 기계공학과 석사
1993 MIT, Mechanical Engineering, Ph.D.,
1993년 7월 - 현재 University of Toronto, 기계공학과 조교수, 부교수
2000년 1월 - 2000년 6월 서울대학교 기계설계학과 교환교수
7. 연락처 : 기계항공공학부 조영만 교수 (880 - 1694)
