Effect of branch length on 13C NMR relaxation properties in molten poly[ethyleneco-α-olefin)] model systems

被引：21

作者：

Parkinson, Matthew ^{[1
]}

Klimke, Katja ^{[1
]}

Spiess, Hans Wolfgang ^{[1
]}

Wilhelm, Manfred ^{[1
]}

机构：

[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2007年 / 208卷 / 19-20期

关键词：

branch length; melt; NMR; polyethylene; spin-lattice; relaxation;

D O I：

10.1002/macp.200700209

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The potential of branch length discrimination for branches containing six and more carbons via bulk NMR relaxation properties in the melt-state has been explored. A systematic increase in the C-13 spin-lattice relaxation time (T-1(c)) of the terminal branch carbons 1 and 2 was observed when the branch increased from 6 to 16 carbons in length. The measurement of 7,c via inversion recovery at high-field showed the most reliable data. The effects of saturation and NOE were addressed by using recycle delays longer than 5 x T-1(C) and the use of the saturation recovery was found to be unsatisfactory. All nuclear relaxation times were determined in a highly time efficient manner using a previously developed melt-state MAS NMR method.

引用

页码：2128 / 2133

页数：6

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