Effect of ultraviolet irradiation on the thermal stability of bleached eucalyptus kraft pulp

被引：1

作者：

Botaro, Vagner Roberto ^{[1
]}

Novack, Katia Monteiro ^{[2
]}

Colodette, Jorge Luiz ^{[3
]}

De Caux, Leonardo Souza ^{[4
]}

机构：

[1] Univ Fed Sao Carlos, Sorocaba, SP, Brazil

[2] Univ Fed Ouro Preto, ICEB DEQUI, Ouro Preto, MG, Brazil

[3] Univ Fed Vicosa, Vicosa, MG, Brazil

[4] CENIBRA BRASIL, Belo Oriente, Distrito De Per, Brazil

来源：

TAPPI JOURNAL | 2012年 / 11卷 / 02期

关键词：

NATURAL FIBERS; PURE CELLULOSE; ORGANIC-ACIDS; DEGRADATION; PAPER; CRYSTALLINITY; DERIVATIVES; MICROSCOPY; HARDWOOD; BEHAVIOR;

D O I：

10.32964/TJ11.2.69

中图分类号：

TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];

学科分类号：

0805 ; 080502 ; 0822 ;

摘要：

The changes occurring on cellulosic fibers caused by ultraviolet irradiation at 360 nm for 24 h and 48 h were investigated. A never-dried industrial Eucalyptus urograndis elemental chlorine free-bleached kraft pulp sample (O/OD[EP]DP sequence) was used throughout the work. After irradiation, the cellulosic fibers were analyzed for polymerization degree changes, extractive and pentosan content, ultraviolet and visible spectrometric changes of water leachate from the fibers and thermal analysis (TGA/DTA). The ultraviolet treatment had no effect on the degree of cellulose polymerization. The water extracted from ultraviolet-treated fibers revealed cellulose oxidation, with increasing absorbance signals for carbonyl and carboxyl groups. Those oxidations influenced fiber thermal stability.

引用

页码：69 / 74

页数：6

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