Morphology and Mechanical Properties of Poly(β-hydroxybutyrate) /Poly(ε-caprolactone) Blends Controlled with Cellulosic Particles
writer：Jianxiang Chen, Yuankun Wang, Zeren Yin, Kam C. Tam, Defeng Wu
keywords：microcrystalline cellulose; ethyl cellulose; polyester blends; morphology; mechanical properties.
source：期刊
specific source：Carbohydrate Polymers
Issue time：2017年
Carbohydrate Polymers, 2017, 174C, 217-225.
ABSTRACT:
The
rigid microcrystalline cellulose (MCC) particles and semi-rigid ethyl cellulose
(EC) were used to control phase morphology and mechanical properties of
immiscible poly(β-hydroxybutyrate) (PHB)/poly(ε-caprolactone) (PCL) blends. The
interfacial properties were evaluated by the fiber retraction and contact angle
methods. MCC is incompatible with PHB and PCL, and dispersed independently in
the two polymer phases in their blends. However,
EC is more compatible with the two polymers, with a higher affinity for PCL. And
EC prefers locating in PCL domains and at the phase interface. Selective
localization of MCC and EC affects the mechanical properties and phase structure
of PHB/PCL blends strongly. For the co-continuous samples, the presence of MCC
and EC improves both the tensile and impact strengths. For the ‘sea-island’
ones, however, the changes of strengths depends strongly on the phase adhesion.
This work will help focus efforts on moderating structure and properties of
immiscible polymer blends using cellulose particles.
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