The relationship between melt index and discrete relaxation time spectrum of polyethylene melts
文献类型：期刊论文
| 作者 | Wang, J; Liang, RF; Guo, SF |
| 刊名 | ACTA POLYMERICA SINICA
 |
| 出版日期 | 1999-08-01 |
| 期号 | 4页码:422-430 |
| 关键词 | Discrete Relaxation Spectrum Least Square Method Linear Regression Regularization Nonlinear Regression |
| ISSN号 | 1000-3304 |
| 英文摘要 | By using dynamic stress rheometer-DSR-200, linear viscoelasticity of four polyethylene melts has been characterized by small amplitude oscillatory shear test. From data of storage moduli G'(omega) and loss moduli G"(omega), discrete relaxation spectra have been obtained for four polyethylene melts by means of linear regression method, regularization method and nonlinear regression method, respectively. Effects of the calculation methods, computing parameters, temperatures and materials on the spectrum have been discussed. It was found that computing parameters-relaxation time numbers and relaxation time range have a strong effect on linear regression and regularization method, but less influence on nonlinear regression method. Three calculation methods can obtain nearly the same relaxation spectrum when choosing fewer relaxation time numbers, but: quite different results when choosing more relaxation time numbers. Both temperature and materials have strong effects on discrete relaxation spectrum due to the structural characteristic of polymers. It is concluded that nonlinear regression method seems to be the best method for the calculation of the discrete relaxation spectrum. |
| 语种 | 英语 |
| WOS记录号 | WOS:000082212800007 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/75515]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Wang, J |
| 作者单位 | Chinese Acad Sci, Inst Chem, State Engn Res Ctr Engn Plast, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, J,Liang, RF,Guo, SF. The relationship between melt index and discrete relaxation time spectrum of polyethylene melts[J]. ACTA POLYMERICA SINICA,1999(4):422-430. |
| APA | Wang, J,Liang, RF,&Guo, SF.(1999).The relationship between melt index and discrete relaxation time spectrum of polyethylene melts.ACTA POLYMERICA SINICA(4),422-430. |
| MLA | Wang, J,et al."The relationship between melt index and discrete relaxation time spectrum of polyethylene melts".ACTA POLYMERICA SINICA .4(1999):422-430. |
入库方式： OAI收割
来源：化学研究所
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