title: Effect of castor oil enrichment layer produced by reaction on the properties of PLA/HDI-g-starch blends.
abstract: 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.
authors.affiliation: Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, PR China.
authors.forename: Zhu
authors.initials: Z
authors.lastname: Xiong
authors.forename: Lisheng
authors.initials: L
authors.lastname: Zhang
authors.forename: Songqi
authors.initials: S
authors.lastname: Ma
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
authors.forename: Chuanzhi
authors.initials: C
authors.lastname: Zhang
authors.forename: Zhaobin
authors.initials: Z
authors.lastname: Tang
authors.forename: Jin
authors.initials: J
authors.lastname: Zhu
mesh_terms: D001673:Biodegradation, Environmental; D002368:Castor Oil / Q000737:chemistry*; D003460:Crystallization; D003485:Cyanates / Q000737:chemistry*; D017953:Isocyanates; D019344:Lactic Acid / Q000737:chemistry*; D008859:Microscopy, Polarization; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D033081:Shear Strength; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength; D013816:Thermodynamics; D014783:Viscosity; D058989:Vitrification
chemical_list: D003485:Cyanates; D017953:Isocyanates; D011091:Polyesters; D011108:Polymers; C015262:1,6-hexamethylene diisocyanate; D019344:Lactic Acid; C033616:poly(lactide); D002368:Castor Oil; D013213:Starch