کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5187141 | 1381121 | 2006 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study diffusion effects on chain extension reactions based on the reptation theory
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Study diffusion effects on chain extension reactions based on the reptation theory Study diffusion effects on chain extension reactions based on the reptation theory](/preview/png/5187141.png)
چکیده انگلیسی
The diffusion effects on chain extension reactions, using carboxyl-terminated polyamide12 (PA12, say CA in this paper) as a model reactant with bisoxazolines (OO), were simulated by the stochastic Monte Carlo (MC) method. The chain length dependence and detailed diffusive behavior of each chain were considered based on the reptation theory. It is found that the diffusion effects retard the progress of chain extension reactions and, lead to a lower coupling efficiency and a lower molecular weight. The simulated results indicate that the diffusion effects can make the final molecular weight distribution (MWD) wider. In the presence of diffusion and with the progress of p, peaks in the evolution curves of weight-average molecule weight (M¯w) and valleys in the evolution curves of polydispersity index, d, are observed, respectively, when p is small enough, which is different from those without diffusion effects, and has been analyzed in detail in this paper. The results also show that the effects of reactant degradation make the MWD of the reaction system wider, and weaken the diffusion effects on the coupling reaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 10, 3 May 2006, Pages 3696-3704
Journal: Polymer - Volume 47, Issue 10, 3 May 2006, Pages 3696-3704
نویسندگان
Li-Tang Yan, Bao-Hua Guo, Jun Xu, Xu-Ming Xie,