Effect of castor oil enrichment layer produced by reaction on the properties of PLA/HDI-g-starch blends

► It has no report about the location of castor oil (CO) in PLA/starch blends. ► The grafting content of hexamethylenediisocyanate (HDI) determined the properties of the PLA/starch/CO blends. ► The size of CO droplets in PLA matrix became smaller and less CO droplets for the blend with HDI grafted s...

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Bibliographic Details
Published in:Carbohydrate polymers 2013-04, Vol.94 (1), p.235-243
Main Authors: Xiong, Zhu, Zhang, Lisheng, Ma, Songqi, Yang, Yong, Zhang, Chuanzhi, Tang, Zhaobin, Zhu, Jin
Format: Article
Language:English
Subjects:
Biodegradation, Environmental
Blends
Castor oil
Castor Oil - chemistry
Crystallization
Cyanates - chemistry
Hexamethylenediisocyanate
Isocyanates
Lactic Acid - chemistry
Microscopy, Polarization
Polyesters
Polylactide
Polymers - chemistry
Shear Strength
Spectroscopy, Fourier Transform Infrared
Starch
Starch - analogs & derivatives
Starch - chemical synthesis
Starch - chemistry
Surface Properties
Tensile Strength
Thermodynamics
Viscosity
Vitrification
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Summary:► It has no report about the location of castor oil (CO) in PLA/starch blends. ► The grafting content of hexamethylenediisocyanate (HDI) determined the properties of the PLA/starch/CO blends. ► The size of CO droplets in PLA matrix became smaller and less CO droplets for the blend with HDI grafted starch. Blends of entirely bio-sourced polymers, namely polylactide (PLA) and starch, have been melt-compounded by lab-scale co-extruder with castor oil (CO) as a plasticizer. The enrichment of castor oil on starch had great effect on the properties of the blends. If the castor oil was mainly dispersed in PLA matrix, the properties of the blends were poor, but when the hexamethylenediisocyanate (HDI) was grafted on starch granules the ready reactions between the hydroxyl on CO and the isocyante on the HDI-grafted starch (HGSTs) brought CO molecules enriched on starch particles. DSC analysis shows that the CO layer on starch has a positive effect on the crystallization of PLA in the ternary blend. The accumulation of CO on starch greatly improves the toughness and impact strength of PLA/starch blends. The grafting content of HDI on the starch granules primarily determined the compatibility and properties of the resulted blends.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2013.01.038