Effect of Interphase Properties on Isothermal and Non-isothermal Crystallization Behavior of Poly(lactic acid)/Acetylated Starch Blends

Rasool Nasseri; Christine Moresoli; Aiping Yu; Zhongshun Yuan; Chunbao Charles Xu

doi:10.1021/acsomega.2c00360

Effect of Interphase Properties on Isothermal and Non-isothermal Crystallization Behavior of Poly(lactic acid)/Acetylated Starch Blends

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Overview

7 Scopus Citations

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Author(s)

Rasool Nasseri
Christine Moresoli
Aiping Yu
Zhongshun Yuan
Chunbao Charles Xu

Detail(s)

Original language	English
Pages (from-to)	27851-27863
Journal / Publication	ACS Omega
Volume	7
Issue number	32
Online published	2 Aug 2022
Publication status	Published - 16 Aug 2022
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1021/acsomega.2c00360 Final Published version
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Attachment(s)	Documents 159765394.pdf Final Published version, 4.27 MB, PDF Publisher's Copyright Statement This full text is made available under CC-BY-NC-ND 4.0. https://creativecommons.org/licenses/by-nc-nd/4.0/
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85135980483&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(bd9cb20a-486f-4687-aa82-b75442dffa4e).html

Abstract

The effect of interphase properties on the crystallization behavior of blends of poly(lactic acid) (PLA)/acetylated starch (AS) with different degrees of substitution (DSs) was investigated. Under isothermal crystallization conditions, the rate of crystallization was higher for PLA/DS0.5 and lower for PLA/DS1.5 and PLA/DS2.5 when compared to PLA. In contrast, non-isothermal crystallization behavior indicated a slower rate of crystallization of PLA/DS0.5 and a faster rate of crystallization of PLA/DS1.5 and PLA/DS2.5 compared to PLA at the highest cooling rate (5 °C/min). The potential relationship between crystallization behavior and interphase properties and interphase thickness and formation of rigid amorphous fraction in the interphase, was investigated. The formation of a rigid amorphous fraction in PLA/DS1.5 and a thick interphase in PLA/DS2.5 prevented the formation of crystals on the dispersed phase and interrupted the crystallization under isothermal conditions. Hydrogen bonding in the PLA/DS1.5 blend and hydrophobic interactions in the PLA/DS2.5 blend may facilitate the crystallization at high cooling rates under non-isothermal conditions. Small-angle X-ray scattering analysis revealed the presence of a smaller lamellar structure in PLA/AS blends. The largest amorphous phase among blends was observed for the PLA/DS1.5 blend, which can be attributed to the hydrogen bonding in the interphase region of this blend. © 2022 American Chemical Society. All rights reserved.