Measurement of the apparent chain propagation rate constants for graft copolymerization by reactive extrusion
文献类型：期刊论文
| 作者 | Shi, Q; Zhu, LC; Cai, CL; Yin, JH |
| 刊名 | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
 |
| 出版日期 | 2005-09-10 |
| 卷号 | 26期号:9页码:1757-1760 |
| 关键词 | Reactive Extrusion Linear Low Density Polyethylene Methyacrylic Acid Apparent Graft Chain Propagation Rate Contant |
| ISSN号 | 0251-0790 |
| 英文摘要 | In this work, the macromolecular peroxide - induced grafting of MAA onto LLDPE by reactive extrusion was chosen as model system to study the apparent chain propagation rate coefficients for both graft reaction(k(p,g)) and homopolymerization of grafting monomers(k(p,h)). The time-evolution rates of graft copolymerization and homopolymerization both exhibited two stages, linear and flat stage, which were controlled by monomer solubility and diffusion. By measuring the concentration of free-radicals and initial polymerization rate, which were determined with electron spin resonance spectroscopy( ESR) and Fourier transform infrared spectroscopy( FTIR), k(p,g) and k(p,h) were obtained. It was found that k(p,g) increased with increasing temperature, while k(p,h) decreased when the temperature was over 200 degrees C, this has been attributed to the effect of ceiling temperature. That the value of k(p,h) was always larger than k(p,g) was also observed, indicating that graft copolymerization was not dominant reaction in this grafting process. The measured data were in agreement with theoretical calculations, which showed that this technique reliably and directly provides individually apparent chain propagation rate coefficients. |
| 语种 | 英语 |
| WOS记录号 | WOS:000232081400043 |
| 出版者 | HIGHER EDUCATION PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/56513]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Yin, JH |
| 作者单位 | Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi, Q,Zhu, LC,Cai, CL,et al. Measurement of the apparent chain propagation rate constants for graft copolymerization by reactive extrusion[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2005,26(9):1757-1760. |
| APA | Shi, Q,Zhu, LC,Cai, CL,&Yin, JH.(2005).Measurement of the apparent chain propagation rate constants for graft copolymerization by reactive extrusion.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,26(9),1757-1760. |
| MLA | Shi, Q,et al."Measurement of the apparent chain propagation rate constants for graft copolymerization by reactive extrusion".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 26.9(2005):1757-1760. |
入库方式： OAI收割
来源：化学研究所
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