ICCAS OpenIR
The relationship between melt index and discrete relaxation time spectrum of polyethylene melts
Wang, J; Liang, RF; Guo, SF
1999-08-01
Source PublicationACTA POLYMERICA SINICA
ISSN1000-3304
Issue4Pages:422-430
AbstractBy 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.
KeywordDiscrete Relaxation Spectrum Least Square Method Linear Regression Regularization Nonlinear Regression
Indexed BySCI
Language英语
WOS IDWOS:000082212800007
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/75516
Collection中国科学院化学研究所
Corresponding AuthorWang, J
AffiliationChinese Acad Sci, Inst Chem, State Engn Res Ctr Engn Plast, Beijing 100080, Peoples R China
Recommended Citation
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.
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