ZHANG Baolong, TANG Guangliang, YOU Yingcai, SHI Keyu, DU Zhongjie, HUANG Jifu. STUDY ON PROPERTIES OF EPOXY RESIN TOUGHENED BY A FUNCTIONAL MESOMORPHIC POLYMER ——CURING REACTIVITY AND DYNAMIC MECHANICAL PROPERTIES[J]. Acta Polymerica Sinica, 1998,(5):573-579.
ZHANG Baolong, TANG Guangliang, YOU Yingcai, SHI Keyu, DU Zhongjie, HUANG Jifu. STUDY ON PROPERTIES OF EPOXY RESIN TOUGHENED BY A FUNCTIONAL MESOMORPHIC POLYMER ——CURING REACTIVITY AND DYNAMIC MECHANICAL PROPERTIES[J]. Acta Polymerica Sinica, 1998,(5):573-579.DOI:
A series of toughening agents(LCEU-PPG) containing the polypropylene glycol(PPG) flexible space
mesomorphic unit
and reactive urea terminated group were synthesized and used to modify the epoxy resin E51/dicyandiamine(E51/dicy) curing system.The curing reactivity
dynamic mechanical behavior
and impact strength of the modified curing systems were investigated.The results show that the addition of LCEU PPG has improved the impact strength for 3~7 times;has accelerated the curing reaction apparently
leading to the reduction of apparent curing reaction energy (Ea) by 50~70KJ/mol and the fall of curing reaction temperature by 30~40℃.Elastic modulus are almost equal to or higher than that of the unmodified system
although Tg is slightly decreased and β-transition temperature is shifted to a lower temoerature.