Pushing the mechanical strength of PolyHIPEs up to the theoretical limit through living radical polymerization
Pushing the mechanical strength of PolyHIPEs up to the theoretical limit through living radical polymerization
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通过活性自由基聚合将PolyHIPE的机械强度推至理论极限
DOI：
10.1039/c1sm06756g
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发表时间：
2012-01-01
期刊：
影响因子：
3.4
通讯作者：
Gao, Xiang
中科院分区：
文献类型：
--
作者：
Luo, Yingwu;Wang, An-Ni;Gao, Xiang
提出了高内相乳液活性聚合方法。将活性自由基聚合方法之一的可逆加成-断裂链转移聚合（RAFT）引入到HIPE聚合中，制备聚苯乙烯PolyHIPE。活性聚合改变了交联过程，得到高度均匀的PolyHIPE聚合物壁。该方法解决了聚合物的非均匀性问题，显著提高了聚合物的力学强度，其杨氏模量达到了理论值45 MPa，比传统方法提高了3倍以上。不仅保持了PolyHIPE的开孔结构，而且实现了更高的连接性。RAFT试剂的种类和浓度对聚合物的形貌和力学性能均有影响。
High internal phase emulsion (HIPE) living polymerization was proposed in current work. Reversible addition-fragmentation chain transfer polymerization (RAFT), one of the living radical polymerization methods, was introduced to the polymerization of HIPE for the preparation of polystyrene PolyHIPEs. Living polymerization changed the crosslinking process giving a highly homogeneous polymeric wall of PolyHIPEs. The resolving of the heterogeneity problem increased the mechanical strength of PolyHIPEs significantly with the Young's modulus reaching the theoretical value of similar to 45 MPa, which was more than 3 times higher than that by the conventional method. Not only the open-cellular structure of PolyHIPEs was maintained but also a higher connectivity was achieved. Both the type and the concentration of RAFT agents were found to have influence on the morphology and mechanical strength of PolyHIPEs.