Polylactide/Acetylated Nanocrystalline Cellulose Composites Prepared by a Continuous Route: A Phase Interface-Property Relation Study
writer：Chunjiang Xu, Jianxiang Chen, Defeng Wu,* Yang Chen, Qiaolian Lv, Mengqi Wang
keywords：polylactide; acetylated nanocrystalline cellulose; composites; interface; rheology; mechanical properties.
source：期刊
specific source：Carbohydrate Polymers
Issue time：2016年
Carbohydrate Polymers, 2016, 146, 58-66.
ABSTRACT:
A ‘continuous route’ was developed in this work for the preparation
of nanocrystalline cellulose (NCC) filled polylactide (PLA) composites. It
combines several separated steps, including extraction of NCC, surface acetylation
of NCC, and final composite preparation, into a continuous process, without traditional freeze drying. The obtained PLA composites were then studied in
terms of phase interface structure, rheological and mechanical properties. The
results reveal that surface acetylation of
NCC can improve its affinity to PLA evidently. The thickened interfacial
layer makes the system filled with modified NCC show lower percolation
threshold than the one filled with pristine NCC; and the former presents a
typical strain-scaling
stress overshoot behavior in the start-up shear flow because the network
structure of modified NCC presents stronger characteristics of self-similarity. The phase interface adhesion also
plays an important role in the mechanical behavior of PLA/NCC composites, which is further revealed by the nanomechanical
analysis using atom force microscopy.
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