Esterification of Low Molecular Weight Acids in Cellulose

被引：10

作者：

Ese, Marit-Helen Glomm ^{[1
]}

Liland, Knut Brede ^{[1
]}

Lesaint, Cedric ^{[1
]}

Kes, Murside ^{[2
]}

机构：

[1] Sintef Energy Res, Dept Elect Power Engn, NO-7465 Trondheim, Norway

[2] Norwegian Univ Sci & Technol, Dept Biotechnol, NOBIPOL, NO-7465 Trondheim, Norway

来源：

IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | 2014年 / 21卷 / 02期

关键词：

low molecular weight acids; paper insulation; ageing; transformers; esterification; OIL IMPREGNATED CELLULOSE; POWER TRANSFORMERS; MINERAL-OIL; PAPER INSULATION; HISTORY;

D O I：

10.1109/TDEI.2013.004238

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The interaction between low molecular weight acids dissolved in mineral oil with cellulose has been studied. The formation of esters as a function of temperature has been demonstrated using attenuated total reflection infrared (IR) spectroscopy. Higher temperatures lead to a shift towards ester formation compared to lower temperatures. This reaction might be reversed by exposing the cellulose to an excess of water at elevated temperatures. However, this hydrolysis of the esters will not be complete, leaving some of the initially free acids trapped in the paper as esters. Regarding degradation of the cellulose, only free acids with a carbonyl group available will enhance the break-up of the glycosidic bonds in the cellulose polymer. Therefore it seems more appropriate to use cold water extraction in order to quantify the amount of free acids in the paper/pressboard.

引用

页码：662 / 665

页数：4

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