THE COLOR REVERSION OF PAPERS MADE FROM HIGH-YIELD PULP - A PHOTOCHROMIC PROCESS

被引:16
作者
CHOUDHURY, H [1 ]
COLLINS, S [1 ]
DAVIDSON, RS [1 ]
机构
[1] UNIV KENT,CHEM LAB,CANTERBURY CT2 7NH,KENT,ENGLAND
关键词
D O I
10.1016/1010-6030(92)85267-X
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A modified fluorescence microscope has been used to sequentially irradiate paper with UV and blue light for known periods of time and to monitor the changes in fluorescence intensity during irradiation. It was confirmed that cellulose shows colour reversion but this effect is far more marked for paper made from high yield pulps. A similar effect is also seen for such papers which have been weathered, bleached with hydrogen peroxide and photobleached with thiourea-dioxide. The colour reversion process appears to involve both photodegradation and photochromic reactions. Chemical species contained in a hydroxypropylcellulose film, which may be responsible for the photochromic effect, were studied, i.e. a quinone and a phenylcoumarin. Some evidence to support the view that phenylcoumarins are photochromic is presented.
引用
收藏
页码:109 / 119
页数:11
相关论文
共 18 条
  • [1] ANDRADY AL, 1991, TAPPI J, V74, P162
  • [2] PHOTODEGRADATION OF LIGNIN - A PHOTOCHEMICAL STUDY OF A PHENOLIC ALPHA-CARBONYL BETA-O-4 LIGNIN MODEL DIMER 4-HYDROXY-3-METHOXY-ALPHA-(2'-METHOXYPHENOXY)-ACETOPHENONE
    CASTELLAN, A
    COLOMBO, N
    CUCUPHAT, C
    DEVIOLET, PF
    [J]. HOLZFORSCHUNG, 1989, 43 (03) : 179 - 185
  • [3] CLAESSON S, 1968, SVEN PAPPERSTIDN, V71, P335
  • [4] A STUDY OF THE PHOTOYELLOWING OF PAPER MADE FROM BLEACHED CTMP
    DAVIDSON, RS
    DUNN, LA
    CASTELLAN, A
    COLOMBO, N
    NOURMAMODE, A
    ZHU, JH
    [J]. JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY, 1991, 11 (04) : 419 - 437
  • [5] DAVIDSON RS, 1991, J PHOTOCH PHOTOBIO A, V58, P349
  • [6] DAVIDSON RS, 1991, PAPER, V10, P24
  • [7] DEVIOLET PF, 1989, CELL CHEM TECHNOL, V23, P535
  • [8] FORSSKAHL I, 1991, 6TH INT S WOOD PULP, P325
  • [9] LEARY GJ, 1967, TAPPI, V50, P17
  • [10] LEBO SE, 1988, TAPPI INT PULP BLEAC, P247