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엔지니어링 플라스틱으로 강인화된 에폭시수지계의 물성 연구
민병각 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.2
The fracture properties of diglycidyl ether of bisphenol A (DGEBA) epoxy resins modified with phenolic hydroxyl-terminated polysulfone (PSF) which is an engineering thermoplastic, and cured with diaminodiphenyl sulfone (DDS) curing agent have been investigated as a function of the molecular weight and concentration of PSF as well as a function of cure conditions. The fracture toughness, measured by compact tension test, increased with increasing molecular weight and/or concentration of the modifier while it was not influenced by cure conditions.
閔丙珏 충주대 산업과학기술연구소 1998 産業科學論文集 Vol.6 No.-
The mechanical behaviors of a DGEBA based epoxy resin(Epikote 8283) cured with an aromatic amine curing agent DDS were studied as a function of cure temperature and cure cycle. The glass transition temperature(which depends on the extent of cure) and the large strain properties including fracture toughness and tensile strength, showed a linear increase with increasing final cure temperature regardless of cure cycle, and level off toward the cure temperature of 200℃. In contrast, the flexural modulus which is a small strain property was not influenced greatly by cure temperature and cure cycle. From the results obtained in this study we infer that the large strain properties of the resin may not be inversely proportional to the crosslink density, but rather that they are more dependent on other structural parameters such as the flexibility of the crosslinked network chains and the free volume entrapped in the network.