分散聚合两步法制备壳交联聚合物微球及自模板制备空心球

发布时间：2018-05-07 05:01

本文选题：分散聚合 + 核-壳微球　；参考：《北京化工大学学报(自然科学版)》2010年06期

【摘要】：采用分散聚合两步加料法,在单体苯乙烯(St)转化率达80%以上时加入交联剂二乙烯基苯(DVB),以未交联内核自身为模板,制备了PS核-P(St-DVB)壳(壳交联)结构微球。然后使用PS的良溶剂THF将未交联内核溶出后,制得了结构规整的空心聚合物微球。采用扫描电镜(SEM)及透射电镜(TEM)观察了所得核-壳、空心球的形貌,探讨了核-壳聚合物微球制备过程引发剂用量、单体浓度及交联剂用量对最终所得空心球形貌的影响。结果表明:增大引发剂用量,微球内核聚合物的分子量减小,内核容易溶出;增大起始单体浓度,壳层交联剂含量相对减小,所得空心球易破裂,刚度下降;单体浓度过低可使交联层致密,不利于内核聚合物溶出,得到蜂窝状空心球;交联剂用量增加,所得空心球的刚度和壁厚增加。
[Abstract]:In this paper, the PS core-PnSt-DVB shell (shell crosslinked) microspheres were prepared by two-step dispersion polymerization with the crosslinking agent divinylbenzene-divinylbenzene (DVBN) as the template, when the monomer styrene (St) conversion was over 80%, and the uncrosslinked core itself was used as the template to prepare the PS core-PnSt-DVB shell (shell crosslinked) microspheres. Then the uncrosslinked core was dissolved by the good solvent THF of PS and the hollow polymer microspheres with structured structure were prepared. The morphologies of the core-shell and hollow spheres were observed by SEM (SEM) and TEM (TEM), and the effects of initiator amount, monomer concentration and crosslinking agent dosage on the morphology of the hollow spheres were investigated during the preparation of core-shell polymer microspheres. The results show that the molecular weight of microsphere core polymer decreases and the core dissolves easily with the increase of initiator content, and the content of shell crosslinker decreases with the increase of the initial monomer concentration, and the hollow spheres are easy to break down and the stiffness decreases. When the monomer concentration is too low, the crosslinking layer is dense, which is not conducive to the dissolution of the core polymer and the honeycomb hollow spheres can be obtained, and the stiffness and wall thickness of the hollow spheres increase with the increase of the amount of crosslinking agent.
【作者单位】：北京化工大学碳纤维及功能高分子教育部重点实验室;
【基金】：国家自然科学基金(20974008/20774007)
【分类号】：TB383.4

【共引文献】