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高于临界聚合反应温度时,α-甲基苯乙烯(AMS)单体和其聚合物处于聚合-解聚平衡.基于AMS聚合物在受热时可裂解生成大分子链自由基的特性,提出了含AMS结构单元的共聚物是一种“活”的,可作为大分子自由基引发剂的概念,并通过实验对AMS共聚物的引发性能和应用进行了研究.首先,合成了AMS与(甲基)丙烯酸酯类单体、丙烯酸、苯乙烯和马来酸酐等的共聚物.然后以上述共聚物为大分子引发剂,在90℃引发(甲基)丙烯酸酯类单体和苯乙烯等的本体聚合、溶液聚合和乳液聚合,得到了嵌段共聚物.用ESR谱证明了AMS的共聚物在加热时能裂解生成以碳原子为中心的大分子链自由基.此外,在聚合物的熔融共混中,AMS分解产生的大分子链自由基通过偶合反应形成接枝链,原位生成相容剂.AMS共聚物还可以对碳纳米管及无机粒子进行表面原位接枝改性.AMS共聚物是一类无小分子残留的绿色自由基引发剂,可以用于低成本制备两嵌段共聚物,也可以用于聚合物的熔融共混增容.
Above the critical polymerization temperature, the α-methylstyrene (AMS) monomer and its polymer are in a polymerization-depolymerization equilibrium. Based on the characteristic that the AMS polymer is cleavable to generate a macromolecular chain radical upon heating, The copolymer containing AMS structural unit is a kind of “living”, which can be used as the initiator of macromolecule free radical, and the initiation performance and application of AMS copolymer have been studied.Firstly, AMS and (Meth) acrylic acid ester monomer, acrylic acid, styrene, maleic anhydride, etc. The above-mentioned copolymer is then used as a macroinitiator and the (meth) acrylic acid ester monomer and the styrene Such as bulk polymerization, solution polymerization and emulsion polymerization, the block copolymer obtained by ESR spectrum proved that AMS copolymers can be cracked when heated to generate carbon atom-centered macromolecular chain free radicals.In addition, the polymer Melt blending, AMS decomposition of the macromolecular chain generated by the coupling reaction of graft chains, in-situ generation of compatibilizers.AMS copolymer can also be on the surface of the carbon nanotubes and inorganic particles graft modified AMS copolymers are a class of non-small molecule residues Color radical initiator may be used in two block copolymers produced at low cost, the polymer may also be used for melt blending a compatibilizer.