Thermal and Crystallization Behavior of PLA/PLLA-Grafting Cellulose Nanocrystal

• 作者: Diego H. S. Souza Erika M. Inácio Marcos L. Dias
• 来源期刊: 材料科学与应用期刊(英文)
• 学科: 工学
• 关键词: NANOCRYSTALS CELLULOSE Poly(Lactic Acid) GRAFTING Crystallizations
• 年，卷（期）: clkxyyyqkyw_2020,（1）
• 页码范围: 44-57
• 页数: 14页
• 分类号: TB3

摘要

PLLA-modified cellulose nanocrystals (CNC) were produced from commercial CNC by tin-catalyzed polymerization of lactide in presence of CNC. FTIR spectroscopy demonstrated that the result of the reaction produced the grafting of PLLA chains onto CNC surface (CNC-g-PLLA). Films of poly(lactic acid) (PLA) and PLA/CNC nanocomposites (with non-modified CNC and CNC-g-PLLA) containing 0.5% and 5% (w/w) of the nanofillers were prepared by casting in chloroform solution and the crystallization behavior and thermal properties investigated. All nano-composites had similar thermal stability when analyzed by TGA analyses under an inert nitrogen atmosphere. Addition of both types of CNC influenced crystallization, the higher crystallization rate being observed for 5% (w/w) CNC. Nanocomposites with 5% (w/w) CNC-g-PLLA had the strain resistance of PLA improved in the rubbery state. PLLA-modification of CNC surface increased the crystallization of PLA in PLA/CNC nanocomposites and improved the rigidity at temperatures above the glass transition, properties which are desirable for hot drinking application.