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首页> 外文期刊>Journal of Applied Polymer Science >Effect of evolved interactions in poly(butylene succinate)/fumed silica biodegradable in situ prepared nanocomposites on molecular weight, material properties, and biodegradability
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Effect of evolved interactions in poly(butylene succinate)/fumed silica biodegradable in situ prepared nanocomposites on molecular weight, material properties, and biodegradability

机译：可生物降解的聚丁二酸丁二醇酯/气相二氧化硅中相互作用演化对分子量，材料性能和生物降解性的影响

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摘要

Poly(butylene succinate) (PBSu)/fumed silica nanocomposites were prepared in situ by condensation polymerization. TEM micrographs verified that the dispersion of the nanoparticles was homogeneous in the PBSu matrix, while some small agglomerates were also formed at a higher SiO_2 content. ~(13)C NMR spectra affirmed that the hydroxyl end groups of PBSu could form covalent bonds with the surface silanol groups of SiO_2. These interactions affected the molecular weight of the prepared nanocomposites. At low concentrations the SiO_2 nanoparticles acted as chain extenders, increasing the molecular weight of PBSu, while at higher loadings they resulted in extended branching and crosslinking reactions, leading to gradually decreased molecular weights. Silica nanoparticles acted as nucleating agents, increasing the crystallization rate of PBSu. However, the degree of crystallinity was slightly reduced. Tensile strength and Young's modulus were significantly increased with increasing SiO_2 content. The presence of the nanoparticles resulted in reduced enzymatic hydrolysis rates compared to pure PBSu, attributed to the smaller available organic surface, due to the incorporation of SiO_2, and to the existence of branched and crosslinked macromolecules. Dynamic mechanical and rheological properties were also extensively studied.
机译：通过缩聚反应原位制备聚丁二酸丁二醇酯（PBSu）/气相二氧化硅纳米复合材料。 TEM显微照片证实，纳米颗粒在PBSu基质中的分散是均匀的，而在SiO_2含量较高时也会形成一些小的团聚体。 〜（13）C NMR光谱证实PBSu的羟基端基可与SiO_2的表面硅烷醇基形成共价键。这些相互作用影响了制备的纳米复合材料的分子量。在低浓度下，SiO_2纳米粒子充当扩链剂，增加了PBSu的分子量，而在较高的负载量下，它们导致了扩展的支化和交联反应，导致分子量逐渐降低。二氧化硅纳米粒子充当成核剂，增加了PBSu的结晶速率。但是，结晶度略有降低。拉伸强度和杨氏模量随着SiO_2含量的增加而显着增加。与纯PBSu相比，纳米颗粒的存在导致酶解速率降低，这归因于由于SiO_2的引入而导致的可用有机表面更小以及分支和交联的大分子的存在。动态力学和流变性能也得到了广泛的研究。

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