Regulating the monomers composition ratio inside the particle nanodomains with induced condensing agent and its impact on particle growth
Regulating the monomers composition ratio inside the particle nanodomains with induced condensing agent and its impact on particle growth
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诱导凝聚剂调节粒子纳米域内单体组成比及其对粒子生长的影响
DOI：
10.1016/j.polymer.2020.123022
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发表时间：
2020-12
期刊：
影响因子：
4.6
通讯作者：
Yang Yongrong
中科院分区：
文献类型：
--
作者：
Jiang Chao;Yang Yao;Jiang Bingbo;Huang Zhengliang;Liao Zuwei;Sun Jingyuan;Wang Jingdai;Yang Yongrong
诱导冷凝剂（伊卡）是气相流化床烯烃聚合中常用的一种传热强化剂。伊卡能显著提高乙烯的瞬时聚合速率，改善乙烯的溶解性，但伊卡对调节聚丙烯纳米微区中烯烃单体的组成比例和粒子生长的影响却知之甚少。在这项工作中，我们研究了这一问题，通过调整浓度的伊卡在共聚阶段的抗冲聚丙烯。该方法可以有效地改变聚丙烯粒子中单体的组成比例，从而为研究聚丙烯粒子的生长效应提供了一个系统的方法。在这里，我们证明了聚丙烯颗粒中的丙烯/乙烯比随着伊卡的加入而上升。颗粒尺寸分析表明，伊卡的存在导致了颗粒尺寸的生物模式分布，表明伊卡的凝聚需要一个基本的压力梯度长度，约为250-500 μm。颗粒表面和内部EPR分布的差异为制备高橡胶含量的HIPP提供了新的前景。这一工作也为冷凝模式冷却烯烃共聚合过程提供了新的见解。
Induced Condensing Agent (ICA) is commonly employed to enhance heat removal of olefin polymerization in gas phase fluidized bed. It is well known that ICA significantly promotes the instantaneous rate of ethylene polymerization and improves the solubility of ethylene, but little is known about the effect of ICA on regulating olefin monomers composition ratio in the nanodomains of polypropylene particles and the particle growth. In this work, we investigated this matter by adjusting the concentration of ICA during the copolymerization stage of impact polypropylene. This method can alter the monomers composition ratio in the polypropylene particles effectively, which, in succession, provides a systematic study on the effect of particle growth. Here we demonstrated that the propylene/ethylene ratio in polypropylene particles rose with addition of ICA. However, the particle size analysis suggested the existence of ICA caused the biomodal size distribution, indicating that the condensation of ICA required an essential pressure gradient length about 250–500 μm. Differential EPR distribution between the surface and internal of the particle provided novel perspectives for producing HIPP with high rubber content. This work also offered new insight into the condensed mode cooling olefin copolymerization process.
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DOI：
10.1002/pola.26592
发表时间：
2013-05
期刊：
Journal of Polymer Science Part A
影响因子：
--
作者：
Torvald Vestberg;Peter Denifl;Carl-Eric Wilén
通讯作者：
Torvald Vestberg;Peter Denifl;Carl-Eric Wilén
影响因子：
1.5
作者：
A. Martins;A. Cancelas;T. McKenna
通讯作者：
A. Martins;A. Cancelas;T. McKenna
影响因子：
4.6
作者：
Yong Chen;Ye Chen;Wei Chen;Decai Yang
通讯作者：
Yong Chen;Ye Chen;Wei Chen;Decai Yang
影响因子：
2.5
作者：
D. Bouzid;T. McKenna
通讯作者：
D. Bouzid;T. McKenna
影响因子：
2.5
作者：
M. Namkajorn;A. Alizadeh;E. Somsook;T. McKenna
通讯作者：
M. Namkajorn;A. Alizadeh;E. Somsook;T. McKenna