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Effect of Stearic Acid-Calcium Carbonate Synergistic Modification on the Mechanical Properties of Plant Fiber /Polylactic Acid Composites
Received:October 16, 2023  
DOI：10.11980/j.issn.0254-508X.2024.04.015
Key Words:plant fiber  polylactic acid  calcium stearate  mechanical properties
Fund Project:广东省自然科学基金（2021A1515011263）。
Author NameAffiliationPostcode
HUANG Yanzhi State Key Lab of Pulp and Papermaking Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
FENG Yucheng State Key Lab of Pulp and Papermaking Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
WU Shuying State Key Lab of Pulp and Papermaking Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
GAO Qiya State Key Lab of Pulp and Papermaking Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
RAO Wanyue State Key Lab of Pulp and Papermaking Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
DONG Xinrui State Key Lab of Pulp and Papermaking Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
YANG Fei* State Key Lab of Pulp and Papermaking Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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Abstract:Taking the stearic acid， CaCl2， NaHCO3 and NaOH were raw materials， the plant fiber was co-modified with stearic acid and calcium carbonate in this study. CaCO3 particles and hydrophobic calcium stearate layer were deposited on the surface of plant fiber， then the modified plant fiber and polylactic acid were prepared into composites by a papermaking process. The results showed that calcium stearate encapsulated CaCO3 particles and covered the surface of plant fiber， which improved the hydrophobicity of fiber. With the increase of c（stearic acid）∶c（NaHCO3）， the mechanical properties of the composites first increased and then decreased. The reaction temperature had little effect on the mechanical properties of the composites. With the increase of c（NaOH）∶c（NaHCO3）， the tensile index and bursting index of the composites first increased and then decreased， while the folding endurance continued to decrease. The best modification conditions were c（stearic acid）∶c（NaHCO3）∶c（NaOH）=4∶6∶6 at 75 ℃. Under optimum conditions， the tensile index， bursting index and folding endurance of prepared composites were 51.0 N·m/g， 3.56 kPa·m2/g and 244 times， respectively.
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