Journal
CELLULAR POLYMERS
Volume 39, Issue 3, Pages 117-137Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0262489320912521
Keywords
PLA; foam; POSS; CNT; chain extender
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Funding
- National Natural Science Foundation of China [51703039]
- Special Project of Cultivating New Academic Seedlings and Exploring Innovation for the Guizhou Institute of Technology [QianKeHe [2017]5789-03]
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Improving foamability of poly (lactic acid) (PLA) resin is a key issue for its critical foaming applications with high-performance and ultralow density. However, owing to the rheological nature of linear PLA chain structure with relatively low molecular weight, the overall foamability of PLA resin cannot meet the processing requirements of foaming purpose. Here, we describe a simple and versatile technique to prepare high foamability PLA resin by inducing chain extender through grafting octa(epoxycyclohexyl) polyhedral oligomeric silsesquioxanes (POSS) on carbon nanotubes (CNT). After the orderly assemble of the two nanoparticles, an obvious increase in melt elasticity of PLA is observed. The enhanced melt elasticity of PLA had a significant effect on controlling subsequent foaming behavior. Thus, a homogeneous and finer cellular morphology of PLA rigid foam was obtained with a proper content of CNT-POSS. Eventually, the expansion ratio of chain-extended PLA foam was 13 times higher than that of unmodified PLA foam. The proposed design methodology will potentially pave a way for designing and preparing high-performance PLA rigid foam products.
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