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首页> 外文期刊>Journal of Applied Polymer Science >Free-radical grafting of trans-ethylene-1,2-dicarboxylic acid onto molten ethylene-vinyl acetate copolymer
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Free-radical grafting of trans-ethylene-1,2-dicarboxylic acid onto molten ethylene-vinyl acetate copolymer

机译：将反式乙烯-1,2-二羧酸自由基接枝到熔融的乙烯-乙酸乙烯酯共聚物上

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摘要

Distinctive features of free-radical grafting of trans-ethylene-1,2- dicarboxylic acid (TEDA) onto macromolecules of molten ethylene-vinyl acetate copolymer (EVA) in the course of reactive extrusion have been investigated along with structure, mechanical characteristics, and high-elastic properties of molten functionalized products (EVA-g-TEDA). It is shown that EVA-g-TEDA yield depends on both the peroxide initiator concentration and content of vinyl acetate units in the copolymer molecular structure. At functionalization, acid grafting is accompanied by secondary reactions of macromolecular degradation and crosslinking. With a low-peroxide initiator concentration (0.1 wt %), degradation prevails; with a higher (0.3 wt %) concentration, crosslinking of macromolecules prevails. It is reported that monomers being grafted attach mostly over secondary carbon atoms in the polymer chain. EVA-g-TEDA appears to have a less perfect crystal structure with a lower-melting temperature and crystallinity as against the starting polymer. The functionalized products display enhanced rigidity and lower deformability in comparison with the initial copolymer. Variations in the swelling ratio and melt strength of EVA-g-TEDA depend on the course of competing secondary processes of macromolecular degradation and crosslinking.
机译：研究了在反应挤出过程中，将反式乙烯-1,2-二羧酸（TEDA）自由基接枝到熔融乙烯-乙酸乙烯酯共聚物（EVA）高分子上的显着特征，以及结构，力学性能和熔融功能化产品（EVA-g-TEDA）的高弹性。结果表明，EVA-g-TEDA的收率取决于过氧化物引发剂的浓度和共聚物分子结构中乙酸乙烯酯单元的含量。在官能化时，酸接枝伴随着大分子降解和交联的次级反应。过氧化物引发剂浓度低（0.1 wt％）时，降解占主导;当具有较高（0.3重量％）浓度时，大分子交联占优势。据报道，接枝的单体大多附着在聚合物链中的仲碳原子上。相对于起始聚合物，EVA-g-TEDA似乎具有不太理想的晶体结构，具有较低的熔融温度和结晶度。与初始共聚物相比，功能化产品显示出更高的刚性和更低的可变形性。 EVA-g-TEDA的溶胀率和熔体强度的变化取决于大分子降解和交联的竞争性次级过程。

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