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Effects of Pulp Beating Degree on Optical and Mechanical Properties of Cellulose Films
Received:March 09, 2022  
DOI：10.11980/j.issn.0254-508X.2022.10.004
Key Words:PFI refining  cellulose film  beating degree  transmittance  haze
Fund Project:国家自然科学基金（22171170，21703131）；陕西省自然科学基础研究计划项目（2021JQ-555）；陕西科技大学博士启动基金（2019BJ-34）；陕西省重点研发计划（2022GY-279）。
Author NameAffiliationPostcode
ZHANG Zhao* College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
LU Siyuan College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
ZHANG Zhizhi College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
CHANG Hui* College of Mechanical and Electrical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
LI Xinping College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
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Abstract:The effect of refining process on the optical and mechanical properties of cellulose films was studied in this paper. The black needle pulp with beating degrees of 60°SR， 70°SR， 80°SR and 90°SR， respectively， were obtained through refining by PFI refiner. Then， the cellulose films were prepared by defibering， vacuum filtration and vacuum drying， of which the transmittance， haze and mechanical properties were measured. The results showed that changing the beating degree of black needle pulp by PFI refining process could adjust the optical and mechanical properties of prepared cellulose films. When the beating degree of black needle pulp increased from 60°SR to 90°SR， the size of the crystalline region of the prepared cellulose film decreased from 8.8 nm to 8.6 nm， the crystallinity decreased from 64.3% to 58.7%， and the transmittance increased from 35.7% to 50.5%， the haze decreased from 97.8% to 94.5%. The tensile strength and tensile strain of cellulose films prepared from black needle pulp with a beating degree of 90°SR reached 31.5 MPa and 7.5%， respectively.
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