Polylactide/cellulose nanocrystals: The in situ polymerization approach to improved nanocomposites

被引：37

作者：

Gazzotti, Stefano ^{[1
,2
]}

Farina, Hermes ^{[1
,2
]}

Lesma, Giordano ^{[1
,2
]}

Rampazzo, Riccardo ^{[1
]}

Piergiovanni, Luciano ^{[2
,3
]}

Ortenzi, Marco Aldo ^{[1
,2
]}

Silvani, Alessandra ^{[1
,2
]}

机构：

[1] Univ Milan, Dipartimento Chim, Via Golgi 19, I-20133 Milan, Italy

[2] Univ Milan, Dipartimento Chim, CRC Mat Polimerici LaMPo, Via Golgi 19, I-20133 Milan, Italy

[3] Univ Milan, Dept Food Environm & Nutr Sci, DeFENS, Via Celoria 2, I-20133 Milan, Italy

来源：

EUROPEAN POLYMER JOURNAL | 2017年 / 94卷

关键词：

Polylactic acid; Cellulose nanocrystals; Nanocomposite; In situ synthesis; Thermal stability; RING-OPENING POLYMERIZATION; SULFURIC-ACID HYDROLYSIS; CELLULOSE NANOCRYSTALS; POLY(L-LACTIC ACID); PACKAGING MATERIALS; BARRIER PROPERTIES; MELTING BEHAVIOR; LACTIC-ACID; FILMS; CRYSTALLIZATION;

D O I：

10.1016/j.eurpolymj.2017.07.014

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The in situ polymerization of L-lactide in the presence of various amounts of cellulose nanocrystals (CNC) is described. CNC was prepared efficiently by acidic hydrolysis of cotton linters. Molecular weight, morphology, thermal, mechanical and crystallization properties of the PLA-CNC nano-composites were evaluated. From size-exclusion chromatography (SEC) analysis, the actual occurrence of chemical bond between CNC and PLA can be assessed. The effect of CNC has been evaluated through differential scanning calorimetry (DSC) analysis, which highlights the probable formation of alpha' crystals in the obtained materials. More importantly, from thermogravimetric analysis (TGA) a marked improvement in thermal stability of nanocomposites has been demonstrated, with respect to standard PLA and to previously described PLA-CNC blends. Nanocomposites show also an improvement in rheological properties with respect to standard PLA. In particular, storage modulus greatly increases, indicating a reinforcing effect of CNC. The described in situ synthetic methodology allows an optimal compatibilization between the two entities (PLA and CNC), facing one of the major problems inherent to the preparation of nano-composites. It leads furthermore to remarkably improved thermal and rheological properties of the obtained materials.

引用

页码：173 / 184

页数：12

共 42 条

[1] Melt polycondensation to improve the dispersion of bacterial cellulose into polylactide via melt compounding: enhanced barrier and mechanical properties [J].