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Modification of epoxy resin with alpha, omega-oligo(butylmethacrylate)diols

: Schröder, N.; Könczöl, L.; Döll, W.; Mülhaupt, R.


Journal of applied polymer science 70 (1998), pp.785-796 : Ill., Lit.
ISSN: 0021-8995
ISSN: 1097-4628
Journal Article
Fraunhofer IWM ()
alpha, omega(butylmethacrylate)diol; epoxy resin; liquid rubber; mechanical property; toughening

Novel liquid rubbers based on bishydroxy-terminated oligo(butylmethacrylate) were used to toughen anhydride cured epoxy resins. Concentration and molecular weight of the toughening agents were varied in order to examine the effects on important mechanical properties such as toughness, strength, stiffness, and glass transition temperature. Experimental data show that telechelic methacrylates are suitable toughening agents for epoxies. The compatibility between resin and toughener can be adjusted by varying the molecular weight of the rubber. Best results are obtained modifying an epoxy resin with 10 wt per cent of bishydroxy-terminated oligo(butylmethacrylate) of a molecular weight of 5000 g/mol. Fracture toughness K(Ic) increases by 150 per cent accompanied by a decrease in modulus of only 1 1 per cent and in strength of 16 per cent as compared to the corresponding properties of the neat resin. Due to an almost complete phase separation of the rubber upon curing glass transition temper ature is scarcely affected.