Constructing Sandwich-Architectured Poly(l-lactide)/High-Melting-Point Poly(l-lactide) Nonwoven Fabrics: Toward Heat-Resistant Poly(l-lactide) Barrier Biocomposites with Full Biodegradability

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Abstract
Heat resistant poly(L-lactide) (PLLA) barrier biocomposites with full biodegradability was realized through the construction of local oriented and compact transcrystallinity supernetworks in the network of high-melting-point poly(L-lactide) (hPLLA) non-woven fabrics composed of high-efficiency nucleating hPLLA fiber through design of two kinds of sandwich-architectures for PLLA/hPLLA non-woven fabrics, where single or double hPLLA non-woven fabrics were introduced at the core or two sides of PLLA matrix film, respectively. The hPLLA fiber induced dense and oriented PLLA transcrystallinity in networks of hPLLA non-woven fabrics and impermeable crystalline layers were formed with well-interlinked lamellae, which served as impermeable barriers to oxygen and water vapor molecules. Moreover, hPLLA non-woven fabrics involving the compact transcrystallinity behaved as framework to support the PLLA matrix and resist the thermal deformation. The sandwich-architectured PLLA with double hPLLA non-woven fabrics exhibited better barrier properties and heat resistance than that with single hPLLA non-woven fabrics. Compared with neat PLLA, the oxygen permeability coefficient and water permeability coefficient of PLLA/double hPLLA non-woven fabric biocomposites significantly decreased by 61.7% and 58.7%, and the storage modulus increased by 160 times at 80 ºC. This work provides a novel method to fabricate heat resistant PLLA barrier film with full biodegradability for packaging application.
Funding Information
  • National Natural Science Foundation of China (51422305, 21374065, 51503132)

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