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首页> 外文期刊>Journal of Applied Polymer Science >Kinetics of Degradation of PVC-Containing Novel Neem Oil as Stabilizer
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Kinetics of Degradation of PVC-Containing Novel Neem Oil as Stabilizer

机译：含PVC的新型印em油作为稳定剂的降解动力学

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The effectiveness of adding epoxidized neem oil (ENO) in poly(vinyl chloride) (PVC) to enhance heat stability was investigated. Neem oil, of vegetable extract, was characterized for its fatty acid profile and other properties. The virgin oil was epoxidized at 60 C with peroxymethanoic acid (performic acid) generated in situ in the reaction mixture by reacting hydrogen peroxide and methanoic acid. ENO was characterized by FTIR and NMR studies, and the degree of epoxidation was measured with iodine value and oxirane oxygen content. Solubility parameters of neem oil and ENO were estimated. Thermal degradation of PVC-containing ENO was studied using the static heat stability test and artificial aging at temperatures of 100, 110, 120, and 130 C. Results were compared with the samples prepared with conventional heat stabilizers systems used in PVC, such as Ca/ Zn stearates and mixtures of both Ca/Zn stearates and ENO. The changes in elastic modulus of the ENO/PVC combination and the conventionally stabilized Ca/Zn system during aging were kinetically modeled, and the rate constants for the degradative influence of modulus were determined. The activation energies and preexponential factors for the degradative process were obtained from Arrhenius plots and their relationship through a compensation effect was found. In general, ENO was found to be an effective retarder of the degradation of PVC; use of 10 phr level of ENO showed the least degradation with the highest activation energy. A synergistic effect of ENO and Ca/Zn stearate system was also observed.
机译：研究了在聚氯乙烯（PVC）中添加环氧化印em油（ENO）增强热稳定性的有效性。植物提取物印em油的脂肪酸特征和其他特性得到了表征。通过使过氧化氢和甲烷酸在反应混合物中原位产生的过氧甲烷酸（过甲酸）在60℃下将原始油环氧化。通过FTIR和NMR研究表征ENO，并用碘值和环氧乙烷氧含量测量环氧化程度。估计印em油和ENO的溶解度参数。使用静态热稳定性测试和在100、110、120和130 C的温度下进行人工老化，研究了含PVC的ENO的热降解。将结果与采用传统的用于PVC的热稳定剂体系（如Ca）制备的样品进行了比较。 /硬脂酸锌以及硬脂酸钙/锌和ENO的混合物。通过动力学模拟了ENO / PVC组合和传统稳定的Ca / Zn体系在老化过程中的弹性模量变化，并确定了模量降解影响的速率常数。从Arrhenius图获得了降解过程的活化能和指数前因子，并通过补偿效应发现了它们之间的关系。通常，发现ENO是PVC降解的有效抑制剂。使用10 phr的ENO表现出最小的降解和最高的活化能。还观察到ENO和硬脂酸钙/锌系统的协同作用。

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