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基于通过限制正负离子对之间通道尺度,实现抑制阴离子聚合副反应的设想,在反应挤出制备苯乙烯/丁二烯多嵌段共聚物的过程中引入了一种P-配合物,分别采用一次加料法及二次分段加料法合成了两种不同结构的多嵌段共聚物。结果表明,P-配合物对抑制高温阴离子本体聚合中出现的交联副反应有显著效果,且有利于增加共聚物中聚苯乙烯多嵌段的长度。1H-NMR、GPC、TEM及力学性能的测试表明,所得嵌段共聚物中丁二烯含量均在18%以上,其无缺口冲击强度达45 kJ/m2,与KR03树脂相当。样品PSB-2的弯曲强度从后者的34 MPa提高至56 MPa,同时其弯曲模量及拉伸断裂延伸率的提高幅度也均在40%以上。
Based on the idea of limiting the side reaction of anionic polymerization by limiting the channel size between positive and negative ion pairs, a P-complex was introduced during the reaction extrusion to prepare a styrene / butadiene multiblock copolymer, Two kinds of multi-block copolymer with different structure were synthesized by one-time feeding method and two-stage feeding method. The results showed that the P-complex has a significant effect on inhibiting the cross-linking reaction occurring during the polymerization of the high-temperature anionic bulk, and is beneficial to increase the length of the polystyrene multi-block in the copolymer. The results of 1H-NMR, GPC, TEM and mechanical properties show that the content of butadiene in the obtained block copolymer is above 18% and the notched Izod impact strength is 45 kJ / m2, which is equivalent to KR03 resin. The flexural strength of PSB-2 increased from 34 MPa to 56 MPa and the flexural modulus and tensile elongation at break increased by more than 40%.