서지주요정보
몰폴로지 스펙트럼을 가진 에폭시/폴리술폰 Semi-IPN = Epoxy/Polysulfone semi-IPN with morphology spectrum
서명 / 저자 몰폴로지 스펙트럼을 가진 에폭시/폴리술폰 Semi-IPN = Epoxy/Polysulfone semi-IPN with morphology spectrum / 민현성.
저자명 민현성 ; Min, Hyun-Sung
발행사항 [대전 : 한국과학기술원, 2001].
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소장정보

등록번호

8012568

소장위치/청구기호

학술문화관(문화관) 보존서고

DCHE 01019

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초록정보

The toughening of thermosetting materials has been recently achieved by the incorporation of high performance thermoplastics such as polysulfone and polyetherimide. The fracture behavior of the thermoplastic modified thermosetting materials is dependent upon the morphological features which are mainly determined with the concentration of the thermoplastic modifier. At low concentration of thermoplastic, the thermoplastic will segregate into spherical domains within thermosetting matrix resulting a moderate increase in fracture toughness, whereas at high concentration of thermoplastic, a co-continuous nodular structure is formed, which gives substantial increase in toughness. However, thermosetting materials with high thermoplastic content often display poor heat and solvent resistance as well as the processing difficulties caused by the high viscosity of the mixture. Thus, it is necessary to develop new methods for toughening thermosetting materials with low thermoplastic content. In the conventional method for thermoset/thermoplastic semi-IPNs, homogeneous mixture with uniform concentration was preformed before the phase separation occurred. Thus, the final morphology of the conventional semi-IPNs was mainly determined by the composition of the thermoplastic modifier. However, in the novel method using morphology spectrum concept, the concentration profile of thermoplastic component was preformed in thermosetting matrix before the phase separation occurred. The semi-IPN showed the gradient morphology, so-called 'morphology spectrum' which was corresponding to the concentration profile. In this work, thermoset(epoxy)/thermoplastic(polysulfone) semi-IPNs with morphology spectrum were prepared by controlling the kinetics of dissolution and diffusion of the polysulfone component which was preformed as film or particles or porous membrane in shape, and by controlling the kinetics of the curing reaction of epoxy component. Semi-IPNs with morphology spectrum displayed improved toughness with the overall thermoplastic content less than 10 wt %. It was found that the fracture toughness enhancement was proportional to the volume fraction of continuous polysulfone-rich phase. Anisotropic semi-IPN prepared by inserting a porous polysulfone membrane showed $K_{IC}$ value of $1.31 MN/m^{1.5}$, which is 130% higher than that of unmodified epoxy resin.

서지기타정보

서지기타정보
청구기호 {DCHE 01019
형태사항 vii, 79p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hyun-Sung Min
지도교수의 한글표기 : 김성철
지도교수의 영문표기 : Sung-Chul Kim
수록잡지명 : "Fracture toughness of polysulfone/epoxy semi-IPN with morphology spectrum". Polymer bulletin, v.42, pp.221-227 (1999)
학위논문 학위논문(박사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 73-79
주제 에폭시
몰폴로지
구배
강인화
Epoxy
Morphology
Gradient
Toughening
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