Chain length dependence of chain propagation revisited

被引：38

作者：

Olaj, OF ^{[1
]}

Zoder, M ^{[1
]}

Vana, P ^{[1
]}

Kornherr, A ^{[1
]}

Schnöll-Bitai, I ^{[1
]}

Zifferer, G ^{[1
]}

机构：

[1] Univ Vienna, Inst Chem Phys, A-1090 Vienna, Austria

来源：

MACROMOLECULES | 2005年 / 38卷 / 05期

关键词：

D O I：

10.1021/ma048941+

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

On the basis of recently developed numeric procedures, the results obtained for the propagation constants k(p) by means of the PLP-SEC method (pulsed laser polymerization followed by size exclusion chromatographical analysis of the chain length distribution) were subjected to a critical reevaluation and reanalysis particularly with respect to the chain length dependence of k(p). In this context the errors arising from a broadening caused by axial dispersion in the SEC were largely eliminated together with other uncertainties in assessing the characteristic chain length L-0 on which the evaluation of k(p) is based. The main result that refers to the bulk polymerization of methyl methacrylate and styrene in the temperature range 25-70 degreesC is that the previously found negative long-range chain length dependence of k(p) survived this procedure to an extent that widely exceeds the known variation of k(p) for extremely short chains and extends over a range of several hundreds of propagation steps.

引用

页码：1944 / 1948

页数：5

共 37 条

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