Properties of unsaturated polyester/polyurethane hybrid resins불포화 폴리에스터-폴리우레탄 혼성수지의 물성에 관한 연구

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The merging of urethane and polyester technologies results in hybrids which have combinations of propeties that are superior to either of the polymers alone. The unique properties in the cured resin were obtained since urethane chains and the styrene chains in the hybrid resin could be crosslinked by trimethylol pentane(TMP) and divinyl benzene(DVB), respectively, to have improved properties with complex morphologies. Tensile strength of hybrids showed maximum(78MPa) at DVB 10wt%(for UPE alone, 45.5MPa). Impact strength increased as urethane content was increased in the hybrid resin due to the energy absorption of rubbery particles with slight decrease of tensile strength. The hybrid resins which consist of lower molecular weight UPE polyol(Et04) showed higher tensile strength but lower impact strength than those which consist of higher molecular weight UPE(Et12). Dynamic mechanical analysis(DMA) showed the phase separtion when poly(tetramethylene ether) glycol(PTMG) was used as a polyol in the urethane chain due to its incompatibility with propylene glycol in the UPE matrix, so that the impact strength was higher than when polypropylene glycol(PPG) was used. The forming of hybrids improved relative thermal stability indicated by the onset point in thermogravimetric analysis(TGA). Scanning electron microgragh(SEM) showed finely dispersed microdomains of rubber particles and the fracture surface showed shear yielding.
Advisors
Kim, Sung-Chulresearcher김성철researcher
Description
한국과학기술원 : 화학공학과,
Publisher
한국과학기술원
Issue Date
1990
Identifier
67750/325007 / 000891510
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학공학과, 1990, [ xi, 89 p. ]

URI
http://hdl.handle.net/10203/30436
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=67750&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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