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首页> 外文期刊>Journal of Applied Polymer Science >Formation of Highly Oriented Biodegradable Polybutylene Succinate Adipate Nanocomposites: Effects of Cation Structures on Morphology,, Free Volume, and Properties
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Formation of Highly Oriented Biodegradable Polybutylene Succinate Adipate Nanocomposites: Effects of Cation Structures on Morphology,, Free Volume, and Properties

机译：高度定向的可生物降解的聚丁二酸琥珀酸丁二酯己二酸酯纳米复合材料的形成：阳离子结构对形态，自由体积和性能的影响

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Many biodegradable polymer materials have not been found to be suitable replacements for more traditional non-biodegradable polymers owing to their insufficient gas and vapor barrier properties. The use of a series of novel organically modified synthetic fluorohectorites (FHTs) has been explored to produce biodegradable polybutylene succinate adipate (PBSA)-clay nanocomposites with improved barrier. Highly oriented nanoclay structures (clearly showing a tortuous path required to reduce gas and vapor transmission) were observed using transmission electron microscopy (TEM), resulting in a significant reduction in oxygen permeability (up to a 53% decrease). In particular, these oriented structures were observed in the FHTs modified with di poly(oxyethylene) alky, methyl ammonium and the longer chain dimethyl dialkyl ammonium. Orientation and dispersion were found to be a result of chemical functionality, chain length, and unique aspect ratios of these FHTs. It was concluded that this reduction in permeability was predominantly due to the tortuous path created by oriented platelets and not from any nucleating effects the platelets may have had. Interestingly, the FHTs were shown to disrupt crystallinity and no change in free volume (as measured using positron annihilation life-time spectroscopy) was observed. The excetlent clay dispersion and orientation also led to significant increases in other properties.
机译：由于它们的气体和蒸汽阻隔性能不足，因此尚未发现许多可生物降解的聚合物材料可替代更传统的不可生物降解的聚合物。已探索使用一系列新型有机改性的合成氟锂蒙脱石（FHT）来生产具有改善的阻隔性的可生物降解的聚丁二酸丁二酸丁二酯（PBSA）粘土纳米复合材料。使用透射电子显微镜（TEM）观察到高度取向的纳米粘土结构（清楚地显示出减少气体和蒸汽传输所需的曲折路径），导致氧气渗透率显着降低（最多降低了53％）。特别地，在用二聚（氧乙烯）烷基，甲基铵和较长链的二甲基二烷基铵改性的FHT中观察到这些取向的结构。发现取向和分散是这些FHT的化学官能度，链长和独特的长宽比的结果。可以得出结论，渗透率的降低主要是由于定向血小板产生的曲折路径，而不是由于血小板可能具有的任何成核作用。有趣的是，显示出FHT破坏了结晶度，并且未观察到自由体积的变化（使用正电子an没寿命光谱法测量）。优异的粘土分散性和取向性还导致其他性能的显着提高。

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