標題: Semi-IPNs formed from poly(ethylene glycol monomethyl ether acrylate) and an epoxy thermoset
作者: Lin, MS
Liu, CC
應用化學系
Department of Applied Chemistry
關鍵字: semi-IPNs;toughness improvements;shear band yielding
公開日期: 1-二月-1999
摘要: Poly(ethylene glycol monomethyl ether acrylate) (PEGMEA) was synthesized from the reaction of poly(ethylene glycol monomethyl ether) (PEGME) with acryloyl chloride. Semi-IPNs based on various weight ratios of diglycidyl ether of bisphenol A (DGEBA)/PEGMEA were prepared, using isophronediamine (IPDA) and 2,2'-azo-bis (isobutyronitrile) (AIBN) as curing agents. The glass transition temperature and exothermic peak shifts were studied with differential scanning calorimetry (DSC). Viscosity changes during semi-IPN formation were measured with a Brookfield viscometer. Dynamic mechanical properties were investigated by rheometric dynamic spectroscopy (RDS). Stress-strain curves were obtained with an Instron tensile tester, while impact resistance was measured with a computer aided falling dart impact tester. Experimental results revealed retarded curing rates for all semi-IPNs, as evidenced from the shifts of curing exothermic peaks to higher temperatures, together with retarded viscosity increases during semi-IPN formation. These phenomena were interpreted in terms of chain entanglement between epoxy and PEGMEA. Nevertheless, the semi-IPNs indicated good compatibility as inferred from a single T-g in DSC and a single damping peak in RDS for each semi-IPN. Improved tensile stress and strain along with toughness improvements were noticed for this semi-IPN system. Shear band yielding was proposed to interpret this result. (C) 1999 Society of Chemical Industry.
URI: http://hdl.handle.net/11536/31554
ISSN: 0959-8103
期刊: POLYMER INTERNATIONAL
Volume: 48
Issue: 2
起始頁: 137
結束頁: 142
顯示於類別:期刊論文


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