摘要
用聚氧乙烯(PEO)大单体与丙烯酸丁酯(BA)及丙烯酸(AA)共聚,合成了三元规整接枝共聚物,并经离子中和生成了离聚体。研究了共聚条件对各单体转化率及共聚物相对分子质量的影响。产物经纯化后用红外光谱仪、膜渗透压计、凝胶渗透色谱仪等进行了表征。研究了共聚物的平均接枝数、结晶度、力学性能及吸水性,还研究了丙烯酸质量分数、PEO质量分数、中和度及不同离子对离聚体力学性能的影响。结果表明,共聚开始大单体的转化速率大于小单体的,后期则相反。大单体转化率随引发剂用量增加而增加,随大单体占总单体的质量分数及大单体相对分子质量增加而下降,共聚物相对分子质量则随聚合时间增加而增加,随引发剂用量增加而降低。共聚物有一定结晶度及100%～200%的吸水率。三元共聚物中和成离聚体后拉伸强度明显增加,呈热塑性弹性体性质。铅或锌离子中和的离聚体拉伸强度最大。
Ployoxyethylene macromer, n-butyl acrylate and acrylic acid were copolymerized to form terpolymer with uniform polyoxyethylene grafts. The terpolymer was neutralized with metallic ions to form polyoxyethylene-containing ionomers. The effects of terpolymerization conditions on conversion and relative molecular mass of products were studied. The purified products were characterized with IR spectra, VPO, membrane osmometry, GPC etc. The average grafting numbers, crystallinity, water absorbency and mechanical properties of the terpolymer, as well as the effects of different components, neutralization degree and kind of metallic ions on mechanical properties of ionomers, were studied. The results showed that at the beginning of terpolymerization conversion of the macromer was higher than that of the monomers and then vice versa. Conversion of the macromer increased with the amount of initiator, whereas it decreased with the increase of the charging mass fraction or relative molecular mass of the macromer. The relative molecular mass of the terpolymer increased with polymerization time and decreases with the increase of amount of the initiator. The terpolymer had a certain crystallinity and showed an absorbency of 100%-200%. After neutralizing with metallic ion, the product showed an enhanced tensile strength and behaved as a thermoplastic elastomer. The ionomers neutralized with lead or zinc ion showed the highest tensile strength.
出处
《合成橡胶工业》
EI
CAS
CSCD
北大核心
2002年第4期207-211,共5页
China Synthetic Rubber Industry
