Journal
CARBOHYDRATE POLYMERS
Volume 140, Issue -, Pages 374-382Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.12.073
Keywords
Cellulose nanocrystal; Poly(butylene succinate); In situ polymerization; Dicumyl peroxide; Polylactic acid; Composite
Categories
Funding
- National Natural Science Foundation of China [51273109, 51235008]
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Poly( butylene succinate) (PBS)/polylactic acid (PLA) blends modified with dicumyl peroxide (DCP) were reinforced by PBS-g-cellulose nanocrystal (CNC) through melt mixing. PBS-g-CNC was prepared through in situ polymerization and its structure was confirmed by FTIR, C-13 NMR, XPS and GPC analysis after saponification. The morphological analysis of PBSIPLAIPBS-g-CNC composites before and after etched by CH2C12 shows that the addition of DCP and PBS-g-CNC could decrease the size of PBS as a dispersed phase in PLA matrix and improve the dispersion of PBS-g-CNC in both PBS and PLA phases, which could affect the crystallization and mechanical properties of composites. The crystallinity of PLA alpha'-phase crystal in PBSIPLAIPBS-g-CNC composites is increased obviously by the addition of PBS-g-CNC, leading to an increase of the crystallinity of the composites. PBS/PLA blends modified by DCP have high Notched Izod impact strength and moduli, and the values are increased by the addition of PBS-g-CNC. Both storage modulus and glass translation temperature of PBS/PLA blend are increased by DCP and PBS-g-CNC, which is proved by DMA results, showing a weak molecular segment mobility of PBS/PLA matrix. The addition of DCP decreases the crystallization temperature and crystallinity of PBS/PLA composite, but increases the thermal stability of composites, mostly because of the crosslink effect of DCP on PBS/PLA matrix. (C) 2015 Elsevier Ltd. All rights reserved.
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