Preparation and properties of chitin micro-nano fiber/polylactic acid composites
Taking self-made chitin powder(PCH)and chitin micro-nano fiber(MCH)as reinforcing phases for blending and extruding with polylactic acid(PLA),PCH/PLA and MCH/PLA composites were prepared,respectively.The effects of PCH or MCH on the microstructure and various properties of the composites were studied.The results show that compared with PCH,the interface between MCH and PLA is more closely integrated.When the MCH content is 10 wt%,the MCH/PLA composite has a maximum tensile strength of 29.25 MPa and a maximum tensile modulus of 1 657.3 MPa,which are 68.5%and 34.6%higher than those of pure PLA,respectively.Its storage modulus at-30℃is 4 406 MPa,which is 16.3%higher than that of pure PLA.When the PCH content is 5 wt%,the tensile strength of PCH/PLA composite has a maximum tensile strength of 20.27 MPa,which is 16.8%higher than that of pure PLA,while the storage modulus at-30℃is lower than that of pure PLA.Both PCH and MCH can reduce the linear expansion coefficient and water contact angle of PLA,and improve PLA water absorption.When the MCH content is 10 wt%,the linear expansion coefficient of MCH/PLA composite is reduced by 35.8%compared to pure PLA,effectively improv-ing the dimensional stability of the composite.The above results indicate that MCH/PLA composite with 10 wt%MCH has the potential to replace petroleum-based plastics in biodegradable packaging and other fields.
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