Research of Modificating Unsaturated Polyester Resinby Copolymerizing Bismaleimide
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摘要: 利用双马来酰亚胺(BMI)作为共聚单体与不饱和聚酯(UP)树脂进行共聚反应,使其玻璃化转变温度、弹性储能模量、拉伸和弯曲性能都有大幅度的提高,尤其是70 ℃下力学性能有明显改观.利用红外光谱法测定了上述共聚树脂体系中不饱和聚酯、苯乙烯、双马来酰亚胺各自双键的聚合反应程度,分别为70.83%,95.46%和97.69%.实验结果表明由于BMI的参与,大大提高了UP树脂的固化反应活性.试样的断口形貌表明上述共聚树脂呈均相组织结构.Abstract: The modification of an unsaturated polyester(UP) resin by copolymering a second co-reactive monomer as thermosetting bismaleimide(BMI) was studied. The resulting inter-crosslinked network showed an obvious enchancement of the glass transition temperature ,elastic modulus and strength. FTIR is used to investigate the c=c double bond conversion of the various reactive species in the copolymerization.The conversions are 70.83%,95.64% and 97.69%for UP resin ,styrene and BMI respectively.It was shown that BMI is strongly accelerated in the curing reaction of the UP resin. SEM analysis performed on the fracture surface of the various investigated resin system showed that there was no evidence of phase seperation.
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Key words:
- unsaturated polyesters /
- imide /
- modification by copolymerisation
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