Highly Biodegradable and Tough Polylactic Acid-Cellulose Nanocrystal Composite

被引：134
作者：
Muiruri, Joseph K. [1 ,2 ]
Liu, Songlin [2 ]
Teo, Wern Sze [3 ]
Kong, Junhua [2 ]
He, Chaobin [1 ,2 ]
机构：
[1] Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117576, Singapore
[2] Agcy Sci Technol & Res, Inst Mat Res & Engn, 2 Fusionopolis Way,Innovis 08-03, Singapore 138634, Singapore
[3] Agcy Sci Technol & Res, Singapore Inst Mfg Technol, 2 Fusionopolis Way,Innovis 08-04, Singapore 138634, Singapore
来源：
ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2017年 / 5卷 / 05期
关键词：
Stereocomplex; Sustainability; Poly(lactide); Small angle X-ray scattering; STEREOCOMPLEX FORMATION; CRYSTALLIZATION BEHAVIOR; MECHANICAL-PROPERTIES; BLENDS; POLY(L-LACTIDE); MORPHOLOGY; CNC;
D O I：
10.1021/acssuschemeng.6b03123
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Poly(L-lactide) cellulose nanocrystals-filled nanocomposites were fabricated by blending of cellulose nanocrystalsg-rubber-g-poly(D-lactide) (CNC-rD-PDLA) and commercial PLLA, in which CNC-g-rubber was synthesized by ring opening polymerization (ROP) of D-lactide and a epsilon-caprolactone mixture to obtain CNC-P(CL-DLA), followed by further polymerization of D-lactide to obtain CNC-rD-PDLA. X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and solubility tests confirmed successful grafting of the rubber segment and the PDLA segment onto CNC. Stereocomplexation between CNC-rDPDLA nanofillers and PLLA matrix was confirmed by FT-IR, XRD, and differential scanning calorimetry (DSC) characterization. The PLLA/CNC-rD-PDLA nanocomposites exhibited greatly improved tensile toughness. With 2.5% CNC-rD-PDLA loading, strain at break of PLLA/CNC-rD-PDLA was increased 20-fold, and the composite shows potential to replace poly(ethylene terephthalate). SEM and small-angle X-ray scattering (SAXS) investigations revealed that fibrillation and crazing during deformation of PLLA/CNC-rD-PDLA nanocomposites were the major toughening mechanisms in this system. The highly biodegradable and tough cellulose nanocrystals-filled PLLA nanocomposites could tremendously widen the range of industrial applications of PLA.
引用
收藏
页码：3929 / 3937
页数：9
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