In:
Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 887-888 ( 2014-2), p. 575-580
Abstract:
In order to increase the application prospect of calcium lignosulfonate in phenolic resin, Calcium lignosulfonate was oxidatively degraded by Hydrogen peroxide under alkaline condition. Both lignins were characterized by FT-IR, 1 H NMR, UV, GC-MS and GPC. The optimal degradation conditions are: lignosulfonate:water=1:1, wt/wt, pH=10, temperature 60 °C, reaction time 2 h, and H 2 O 2 dosage 6 wt% (based on weight of lignosulfonate). The results show that the degraded resultant is higher in phenolic contents, and lower in methoxyl content. Number molecular weight ( M n ) of calcium lignosulfonate sharply decreases to 2294, versus 17774 before oxidative degradation.Guaiacly monoer content increased and kinds of phenolic compounds occurre in oxidative degradation fractions, mainly due to β -O-4 and β -5 cleavage. And reactive activity of the oxidatively degraded compounds is sharply increased.
Type of Medium:
Online Resource
ISSN:
1662-8985
DOI:
10.4028/www.scientific.net/AMR.887-888
DOI:
10.4028/www.scientific.net/AMR.887-888.575
Language:
Unknown
Publisher:
Trans Tech Publications, Ltd.
Publication Date:
2014
detail.hit.zdb_id:
2265002-7
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