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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Zinc Stearate and /or Epoxidized Soybean Oil on Gelation and Thermal Stability of PVC-DOP Plastigels
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Effect of Zinc Stearate and /or Epoxidized Soybean Oil on Gelation and Thermal Stability of PVC-DOP Plastigels

机译：硬脂酸锌和/或环氧大豆油对PVC-DOP胶凝化和热稳定性的影响

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摘要

The feefcts of zinc stearate (ZnSt_2) and/or epoxidized soybean oil (ESO)on mechanical properties and on thermal stability of plastigels obtained from polyvinylchloride (PVC) and dioctylphthalate (DOP) plastisols were studied using calorimetric,spectroscopic,and tensile-testing techniques.Plastigels having 2.5 or 5.0 part ZnSt_2 and/or 5 part ESO and 60 part DOP per 100 part PVC (phr) were gelled by heating at 140 deg C.The tensile strength of plastigels with no additive and having 5 phr ZnSt_2,ESO,and both ZhSt_2 adn ESO were 0.79,0.56,0.98,and 0.58 kN/cm~2,respectively.The decrease of tensile strength of plastigels with ZnSt_2 could be explained by the existence of ZnSt_2 in the solid phase in plastigels,as shown by differential scanning calorimetry (DSC).ESC helped better fusion of the plastisols without any additive and with ZnSt_2.Higher tensile strengths of ESO containing plates indicate dmore complete gelation of the plastisols.The thermal stability of plastigelsin terms of color and their yellowness indx (VI) were higher for ZnSt_2 containing plastigels.Conjugated polyene concentrations were calculated from UV spectra of the films heated at 140 deg C.The reaction rate constant of the dehydrochlorination of PVC changed with the additives.Faster dehydrochlorination than control gels occurred in gels having ZnSt_2 at long heating times due to the autoaccelerating effect of ZnCl_2 formed by reaction of eliminated hydrogen chloride ane ZnSt_2.Organic acid formation reaction between ZnSt_2 and HCl formed by dehydrochlorination is investigated from the IR band at 1540 cm~(-1) and 3400 cm~(-1) during heating of the plastigel films.A synergistic effect of ESO and ZnSt_2 was observed when the mechanical strength and heat stability were considered together.Although ESO increased tensile strength,ZnSt_2 increased thermal stability of the plastigels at early times when they were present simultaneously in plastisols.
机译：使用量热，光谱和拉伸测试技术研究了硬脂酸锌（ZnSt_2）和/或环氧化大豆油（ESO）对由聚氯乙烯（PVC）和邻苯二甲酸二辛酯（DOP）制成的塑料溶胶的机械性能和热稳定性的影响每100份PVC（phr）具有2.5或5.0份ZnSt_2和/或5份ESO和60份DOP的塑料通过在140摄氏度下加热而胶化。不含添加剂且具有5 phr ZnSt_2，ESO的塑料的拉伸强度ZhSt_2和ESO分别为0.79、0.56、0.98和0.58 kN / cm〜2。扫描量热法（DSC）.ESC有助于在没有任何添加剂和ZnSt_2的情况下更好地融合增塑溶胶。含ESO的板的抗张强度更高，表明增塑溶胶完全胶凝。含ZnSt_2的塑料薄膜的r和黄色指数（VI）较高。从140℃加热的薄膜的紫外光谱计算出共轭多烯的浓度。PVC脱氯化氢的反应速率常数随添加剂的变化而变化。 ZnSt_2的凝胶在加热时间长的情况下会发生凝胶，这是由于消除的氯化氢与ZnSt_2反应生成的ZnCl_2的自加速作用所致。从1540 cm〜（-）处的IR波段研究了ZnSt_2与HCl脱氯化氢形成有机酸的反应。 1）和3400 cm〜（-1）在加热塑料薄膜时。同时考虑到机械强度和热稳定性时，ESO和ZnSt_2具有协同作用。虽然ESO增加了拉伸强度，但ZnSt_2增加了塑料薄膜的热稳定性当它们同时存在于增塑溶胶中时。

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