摘要
以过氧化二异丙苯(DCP)和过氧化二苯甲酰(BPO)为引发剂,采用熔融法制备了马来酸酐(MAH)接枝反式聚异戊二烯(TPI)共聚物(TPI-g-MAH),通过傅里叶变换红外光谱仪、核磁共振波谱仪和差示扫描量热(DSC)仪对TPI-g-MAH进行了表征,探讨了接枝反应机理,研究了DCP和MAH用量对接枝产物TPI-g-MAH力学性能的影响。结果表明,以DCP、BPO作为引发剂,用熔融法制备的TPI-g-MAH均存在接枝现象,MAH主要与TPI中的α氢原子发生取代反应而接入TPI大分子链上,用DCP作为引发剂接枝率高、凝胶质量分数小。TPI-g-MAH的DSC谱图由双峰分布转向单峰分布,加入DCP引发剂得到的TPI-g-MAH比加入BPO引发剂得到的TPI-g-MAH的DSC谱图熔融峰窄、峰面积小。与纯TPI相比,TPI-g-MAH的拉伸强度下降,随着MAH和DCP用量的增加,TPI-g-MAH的拉伸强度下降明显。
The maleic anhydride(MAH) grafted trans-isoprene(TPI) copolymer(TPI-g-MAH) was prepared by melting method with dicumyl peroxide(DCP) and benzoyl peroxide(BPO) as initiators. TPI-g-MAH was characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance and differential scanning calorimeter(DSC). The mechanism of grafting reaction was discussed. The effects of amount of DCP and MAH on the mechanical properties of TPI-g-MAH were studied. The results showed that TPI-g-MAH prepared by melting method had graft phenomenon with DCP and BPO as initiator. MAH was in substitution reaction with the α hydrogen atom in TPI to access the chain of TPI, and DCP was used as initiator to increase the graf-ting rate and the mass fraction of gel was small. The DSC spectra of TPI-g-MAH changed from bimodal distribution to unimodal distribution. TPI-g-MAH obtained by adding DCP initiator had narrower melting peak and smaller peak area than TPI-g-MAH obtained by adding BPO initiator. Compared with pure TPI, the tensile strength of TPI-g-MAH decreased, and the tensile strength of TPI-g-MAH decreased significantly with the increase of MAH and DCP.
作者
汤琦
宗绪凯
杜淼
宗成中
TANG Qi;ZONG Xu-kai;DU Miao;ZONG Cheng-zhong(School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)
出处
《合成橡胶工业》
CAS
北大核心
2019年第6期435-439,共5页
China Synthetic Rubber Industry
