采用单电子转移-活性自由基聚合(SET-LRP)法合成了活性聚丙烯酸丁酯(L-PBA),采用核磁共振谱仪对其分子结构进行了表征;通过改变单体/引发剂摩尔比,二次引发的单体/大分子引发剂摩尔比,以及多级引发3种途径验证了L-PBA具有反应活性,并且发现L-PBA的相对分子质量可以进行控制;当采用L-PBA再次引发BA聚合时,可在较短时间内(3.5h)、单体/大分子引发剂摩尔比较高时(6665/1),获得较高单体转化率(31.3％),表明大分子引发剂比小分子引发剂活性高;凝胶渗透色谱结果还显示,多级引发所得L-PBA的相对分子质量分布,随单体/大分子引发剂摩尔比及引发级数的增加而变宽,当产物相对分子质量达到19万左右时产物相对分子质量分布出现双峰,原因与体系中活性种与休眠种间快速转换的失衡有关.
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