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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and crystallization behavior of acetal copolymer/silica nanocomposite by in situ cationic ring-opening copolymerization of trioxane and 1,3-dioxolane
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Synthesis and crystallization behavior of acetal copolymer/silica nanocomposite by in situ cationic ring-opening copolymerization of trioxane and 1,3-dioxolane

机译：三恶烷和1,3-二氧戊环的阳离子原位开环共聚反应缩醛共聚物/二氧化硅纳米复合材料的合成和结晶行为

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摘要

The acetal copolymer/silica nanocomposite was prepared by in situ bulk cationic copolymerization of trioxane and 1,3-dioxolane in the presence of nanosilica. The crystallization behavior of acetal copolymer/silica nanocomposite was studied by AFM, DSC, XRD, and CPOM, and the macromolecular structure of acetal copolymer/silica nanocomposite was characterized by FTIR and H-1-NMR. The H-1-NMR results showed that the macromolecular chain of acetal copolymer had more than two consecutive 1,3-dioxolane units in an oxymethylene main chain, while that of acetal copolymer/silica nanocomposite had only one 1,3-dioxolane unit in an oxymethylene main chain. There existed interaction between the macromolecular chains and nanoparticles (such as hydrogen bonds and coordination). On one hand, nanoparticles acted as nucleation center, which accelerated the crystallization rate but reduced the crystallinity. The spherulite sizes also decreased with addition of nanoparticles attributed to the nucleation effect. On the other hand, the presence of nanoparticles interrupted the spherical symmetry of the crystallite. In conclusion, the high surface energy and small scale of nanoparticles have a prominent impact on the polymerization mechanism and crystallization behavior of nanocomposite. (c) 2007 Wiley Periodicals, Inc.
机译：缩醛共聚物/二氧化硅纳米复合材料是通过在纳米二氧化硅存在下三恶烷和1,3-二氧戊环原位阳离子共聚制备的。通过AFM，DSC，XRD和CPOM研究了缩醛共聚物/二氧化硅纳米复合材料的结晶行为，并通过FTIR和H-1-NMR表征了缩醛共聚物/二氧化硅纳米复合材料的大分子结构。 H-1-NMR结果表明，乙缩醛共聚物的大分子链在甲醛主链中具有两个以上的连续1,3-二氧戊环单元，而乙缩醛共聚物/二氧化硅纳米复合材料的大分子链中只有一个1,3-二氧戊环单元。甲醛主链。大分子链与纳米粒子之间存在相互作用（例如氢键和配位）。一方面，纳米粒子充当成核中心，这加快了结晶速率，但降低了结晶度。随着归因于成核作用的纳米颗粒的加入，球晶尺寸也减小了。另一方面，纳米颗粒的存在中断了微晶的球形对称性。总之，纳米粒子的高表面能和小尺寸对纳米复合材料的聚合机理和结晶行为具有显着影响。 （c）2007年Wiley Periodicals，Inc.

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