摘要
根据分子设计原理 ,选择N -苯基马来酰亚胺 (N -PhMI)为耐热改性单体 ,同时 ,引入苯乙烯(St)和甲基丙烯酸甲酯单体 (MMA) ,来提高聚合物的共聚性能和PVC的相容性。以偶氮二异丁腈为引发剂考察了影响三元共聚反应速率的因素 ,结果表明 :聚合温度在 5 5～ 60℃ ,引发剂在 0 .0 1～0 .0 2mg L ,反应较为平稳 ;油水比在 1∶2 .5以下 ,可进行悬浮聚合 ,大于 1∶2 .5悬浮聚合体系易结块 ;共聚单体配比中N -PhMI在体系内溶解度较低 ,但共聚活性很高 ,在 3 5 %下反应速率较平稳。经测试该耐热改性剂与PVC共混后的冲击强度和加工性能 ,完全达到PVC型材的标准要求。
N -PhMI was selected as a heat resistant monomer according to the principle of molecular design.MMA and St were introduced to improve the compatibility and PVC consistence of the copolymer.The polymerization rate was investigated in the presence of AIBN.The results showed that the polymerization rate was smooth when the initiatior was 0.01～0.02 mg/L and the oil-water ratio was less than 1/2.5 at 55～60 ℃.N-PhMI was low soluble in the medium and had high activity.The polymerization was smooth when the mass fraction was less than 35%.The impact strength and processability of PVC blended with the heat resistant modifier.
出处
《石化技术与应用》
CAS
2003年第1期26-28,共3页
Petrochemical Technology & Application
