The efficiency of poly(vinyl chloride) (PVC) plasticization depends predominantly on the strength of PVC–plasticizer interactions, which ultimately depends not only on the intrinsic physicochemical properties of the plasticizer but also those of the polymer. The aim of this work was to study the influence of the morphological properties of different PVC grades (two emulsion (with different K values) and one microsuspension grades) and of nonconventional greener plasticizers on the rheological/aging properties of PVC-based plastisols and on the thermal and plasticizer leaching properties of films obtained from those plastisols. Commercially available castor oil based CITROFOL AHII and GRINDSTED SOFT-N-SAFE were employed as plasticizers, and the phosphonium-based ionic liquid (trihexyl(tetradecyl)phosphonium bistriflamide ([P_6,6,6,14][Tf₂N]) as a coplasticizer. Plastisols formulated with the conventional plasticizer di-isodecyl phthalate (DIDP) were also prepared for comparison. Obtained results showed that the highest shear stress and plastisol aging were observed for plastisols formulated using the lower molecular weight emulsion PVC grade (E70-PVC) and the conventional plasticizer DIDP. The E70-PVC systems formulated using DIDP and citrate-based plasticizer presented a pseudoplastic behavior, while all the other systems presented a Newtonian profile. Lower mixing enthalpies were also calculated for PVC/DIDP systems, indicating more favorable interactions for PVC/phthalate systems over nonconventional plasticizers. The incorporation of [P_6,6,6,14][Tf₂N] as a coplasticizer significantly decreased the enthalpy of mixing of all the prepared plastisols, showing that its presence in the formulations may favor PVC/plasticizer interactions. Moreover, PVC films obtained from plastisols formulated using this ionic liquid presented higher long-term thermal stability due to its negligible vapor pressure that avoids loss during usage.

中文翻译：

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聚氯乙烯的形态学性能对溶胶的流变/老化和非常规增塑剂配制的薄膜的热/浸出性能的影响

聚氯乙烯（PVC）增塑的效率主要取决于PVC与增塑剂相互作用的强度，而强度最终不仅取决于增塑剂的内在物理化学性质，而且还取决于聚合物的内在物理化学性质。这项工作的目的是研究不同PVC等级（两种乳液（具有不同的K值）和一种微悬浮剂等级）和非常规绿色增塑剂的形态学特性对PVC基增塑溶胶的流变/老化性能的影响。由这些增塑溶胶获得的薄膜的热和增塑剂浸出性能。使用市售的蓖麻油基的CITROFOL AHII和GRINDSTED SOFT-N-SAFE作为增塑剂，以及the基的离子液体（三己基（十四烷基）双三氟化（（[P_6,6,6,14 ] [Tf ₂ N]）作为增塑剂。还准备了用常规增塑剂邻苯二甲酸二异癸酯（DIDP）配制的塑料溶胶进行比较。所得结果表明，使用较低分子量乳液PVC级（E70-PVC）和常规增塑剂DIDP配制的增塑溶胶观察到最高的剪切应力和增塑溶胶老化。使用DIDP和基于柠檬酸盐的增塑剂配制的E70-PVC系统表现出假塑性行为，而所有其他系统则表现出牛顿特性。还计算出了PVC / DIDP体系的较低混合焓，表明PVC /邻苯二甲酸酯体系比非常规增塑剂具有更有利的相互作用。[P _6,6,6,14 ] [Tf _2的结合N]作为增塑剂显着降低了所有制备的增塑溶胶的混合焓，表明其在配方中的存在可能有利于PVC /增塑剂的相互作用。而且，由使用该离子液体配制的增塑溶胶获得的PVC薄膜由于其可忽略的蒸气压而避免了使用过程中的损失，因此表现出更高的长期热稳定性。