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Influence of the Degree of Polymerization of Cellulose on Paper Properties in Kraft Bamboo Pulp
Received:September 26, 2024  
DOI：10.11980/j.issn.0254-508X.2025.03.011
Key Words:degree of polymerization of cellulose  bamboo pulp with high degree of polymerization  kraft pulping  mechanical properties
Fund Project:国家自然科学基金（U23A6005）；广东省基础与应用基础研究基金（2023B1515040013）；制浆造纸工程国家重点实验室（2023C05，2022C01）。
Author NameAffiliationPostcode
CUI Xiaokang State Key Lab of Advanced Papermaking and Paper-based Materials， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
FANG Zhiqiang* State Key Lab of Advanced Papermaking and Paper-based Materials， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
ZHAO Sishun State Key Lab of Advanced Papermaking and Paper-based Materials， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LIN Xiaoqi State Key Lab of Advanced Papermaking and Paper-based Materials， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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Abstract:In this study， Bambusa emeiensis was used as the raw material to prepare bamboo pulp via kraft pulping. A systematic orthogonal experimental design was employed to investigate the effects of various pulping conditions on the degree of polymerization （DP） of cellulose of bamboo pulp. The key factors responsible for the rapid decrease of cellulose DP in bamboo pulp cellulose were identified， and the optimal process conditions for producing high cellulose DP bamboo pulp were determined. Subsequently， four types of bamboo pulp with similar morphology but varying cellulose DP were prepared by adjusting the amount and duration of bleaching agents to examine the effect of cellulose DP on the mechanical properties of the resulting paper. The results showed that the influence of pulping conditions on the cellulose DP followed the order： alkali dosage>maximum cooking temperature>holding time>sulfidity. Among these factors， alkali dosage and cooking temperature were the primary contributors to the substantial reduction in cellulose DP. The optimal conditions of kraft pulping were found to be alkali dosage of 12%， maximum cooking temperature of 140 ℃， sulfidity of 10%， and holding time of 50 min. Under these conditions， the cellulose DP of bamboo pulp exceeded 2 186， the pulp yield reached 57.9%， and the lignin content of pulp was 9.12%. Furthermore， the decrease in cellulose DP of bamboo pulp resulted in a sharp reduction in the intrinsic strength of the bamboo fibers， leading to declines in the zero-span tensile strength， burst index， and tear index of the paper， while the tensile strength was almost unaffected.
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