Effects of calcium sulfate whisker on the mechanical property, morphological structure and thermal degradation of poly (lactic acid) composites

A comprehensive investigation on the fabrication and characterization of poly (lactic acid) (PLA) composites with varied mass fraction of calcium sulfate whisker (CSW) was presented. Before compounding, silanization strategy on CSW was performed by γ-(2, 3-epoxypropoxy) propytrimethoxysilane (GPTMS)...

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Bibliographic Details
Published in:Polymer degradation and stability 2017-10, Vol.144, p.270-280
Main Authors: Yang, Ji-nian, Nie, Shi-bin
Format: Article
Language:English
Subjects:
Activation energy
Calcium compounds
Calcium sulfate
Cold-crystallization
Crystallization
Declination
Decomposition reactions
Effects
Elongation
Impact strength
Kinetic analysis
Kinetics
Mechanical properties
Mechanical property
Modulus of elasticity
Polylactic acid
Reaction kinetics
Reaction order
Silanization
Stability analysis
Tensile strength
Thermal decomposition
Thermal degradation
Thermal stability
Thermodynamic properties
Whisker composites
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Summary:A comprehensive investigation on the fabrication and characterization of poly (lactic acid) (PLA) composites with varied mass fraction of calcium sulfate whisker (CSW) was presented. Before compounding, silanization strategy on CSW was performed by γ-(2, 3-epoxypropoxy) propytrimethoxysilane (GPTMS), and then mechanical performance, morphological structure and thermal behavior of PLA/CSW composites were explored carefully. It was found that silanization on CSW succeeded in forming well-bonded interfaces between organized CSW and PLA. Though the added CSW resulted in a moderate declination on tensile strength (less than 20%), it showed significant positive influences on the elastic modulus, elongation at break and impact toughness. The processes of glass transition and cold-crystallization were lagged at low concentration of CSW but accelerated again with further addition of whisker, as also affected the variation of actual crystallinity. However, the thermal stability was improved remarkably and kinetics analysis of thermal decomposition revealed that reaction order was hardly changed while activation energy was decreased along with increased CSW.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2017.08.031