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交联剂引发的乙烯-醋酸乙烯酯非等温交联：动力学建模

Non-isothermal crosslinking of ethylene vinyl acetate initiated by crosslinking agents: kinetic modelling.

作者信息

Zeng Fanwei, Guo Xing, Sun Li, He Xuelian, Zeng Zuoxiang, Liu Zhen

机构信息

School of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China

出版信息

RSC Adv. 2022 May 23;12(24):15623-15630. doi: 10.1039/d2ra01994a. eCollection 2022 May 17.

DOI:10.1039/d2ra01994a
PMID:35685181
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9126645/
Abstract

The non-isothermal crosslinking process of ethylene vinyl acetate (EVA) initiated by several crosslinking agents was studied by using differential scanning calorimetry (DSC). The crosslinking agent -butylperoxy 2-ethylhexyl carbonate (TBEC) exhibited much shorter reaction time and lower reaction temperature. The effect of the crosslinking agent TBEC on the EVA crosslinking process was further analyzed by using Avrami, Ozawa, Mo and Flynn-Wall-Ozawa (FWO) methods, respectively. The small fluctuations in the values of Avrami exponent and Mo parameter indicate that the EVA crosslinking mechanism is basically unchanged with increasing heating rate and crosslinking agent content. The change of the Ozawa exponent is presumably due to the increase in viscosity of EVA/TBEC samples during the crosslinking process. The heating/cooling function () values and the activation energy are dependent on the conversion rate . In addition, shows irregular changes in the early stages of crosslinking, and increases with the increase of conversion rate in the later stages of crosslinking.

摘要

采用差示扫描量热法（DSC）研究了几种交联剂引发的乙烯-醋酸乙烯酯（EVA）非等温交联过程。交联剂2-乙基己基碳酸叔丁酯（TBEC）的反应时间更短，反应温度更低。分别采用Avrami、Ozawa、Mo和Flynn-Wall-Ozawa（FWO）方法进一步分析了交联剂TBEC对EVA交联过程的影响。Avrami指数和Mo参数值的微小波动表明，随着加热速率和交联剂含量的增加，EVA交联机理基本不变。Ozawa指数的变化可能是由于EVA/TBEC样品在交联过程中粘度增加所致。加热/冷却函数（）值和活化能取决于转化率。此外，在交联初期呈不规则变化，在交联后期随转化率的增加而增大。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/98e2bae6e780/d2ra01994a-f9.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/98e2bae6e780/d2ra01994a-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/1ea41d261ca9/d2ra01994a-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/a74287f59489/d2ra01994a-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/9ee289cd4be6/d2ra01994a-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/089a72116e4e/d2ra01994a-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/55a3b5ed7221/d2ra01994a-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/e3fe77dfd8f3/d2ra01994a-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c7d4/9126645/98e2bae6e780/d2ra01994a-f9.jpg

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Multistage kinetic analysis of DMAA/MBAM polymer removal from gelcast ceramic parts using a multi-stage parallel reaction model and model-free method.使用多阶段平行反应模型和无模型方法对从凝胶注模陶瓷部件中去除DMAA/MBAM聚合物进行多阶段动力学分析。
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