In this work, we chose different ratios of glycerol and pentaerythritol to plasticize PVA. The solid and liquid were compounded to plasticize PVA, because pentaerythritol had a large molecular weight and a high boiling point, which can sovle the gycerol’s migration problem and make it beneficial for long-term plasticization. The interaction of the hydroxyl group of a large molecular weight plasticizer with the PVA hydroxyl group has not been observed for the influence of the PVA molecular chain into the crystal lattice. So, this work investigated the crystallization behaviors in detail. The results showed that the addition of plasticizer can change the regular structure of PVA. It made it difficult to discharge the molecular chain into the crystal lattice and hindered the crystallization of PVA. After the addition of plasticizer, the crystallization energy required increased. The XRD indicates that the plasticizers of different molecular weights can effectively destroy the original crystal structure of PVA, and the plasticizer interacted with PVA to form stronger hydrogen bonds to replace the intermolecular phase of PVA itselfs intramolecular interactions.

在这项工作中，我们选择了不同比例的甘油和季戊四醇来增塑PVA。由于季戊四醇具有大的分子量和高的沸点，所以将固体和液体混合以增塑PVA，可以解决甘油的迁移问题，并有利于长期增塑。对于PVA分子链进入晶格的影响，尚未观察到大分子量增塑剂的羟基与PVA羟基的相互作用。因此，这项工作详细研究了结晶行为。结果表明，增塑剂的加入可以改变聚乙烯醇的规则结构。这使得难以将分子链释放到晶格中并且阻碍了PVA的结晶。加入增塑剂后，所需的结晶能量增加。XRD表明，不同分子量的增塑剂可以有效破坏PVA的原始晶体结构，并且增塑剂与PVA相互作用形成更强的氢键，从而取代PVA本身的分子间相互作用。