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Structure and Property of Microinjection Molded Poly(lactic acid) with High Degree of Long Chain Branching
Zhao, Z.-G. Yang, Q. Coates, Philip D. Whiteside, Benjamin R. Kelly, Adrian L. Huang, Y.-J. Wu, P.-P.
Zhao, Z.-G.
Yang, Q.
Coates, Philip D.
Whiteside, Benjamin R.
Kelly, Adrian L.
Huang, Y.-J.
Wu, P.-P.
Publication Date
2018-08-22
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© 2018 ACS. This document is the Accepted Manuscript version of a Published Work that appeared in final form in the I&EC Research, copyright © American Chemical Society after peer-review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.iecr.8b01597.
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Abstract
Long chain branches (LCB) are successfully grafted to linear poly(lactic acid) (PLA) using functional group reactions with pentaerythritol triacrylate (PETA) and tetraethylthiuram disulfide (TETDS). Results show a high branching degree of PLA (∼49.5%) can be effectively obtained with adding only 1 wt % PETA, contributing remarkably to enhancing strain hardening. The density of the nuclei formed during nonisothermal crystallization for LCB-PLA samples is markedly increased contrasted with PLA, resulting in significantly enhancing crystallinity from 13.3% to 41%, the onset crystallization temperature (∼20 °C), and the crystallization rate. Interestingly, compared with mini-injection molding, the elevated wall shear rates (and corresponding shear stresses) prove to be beneficial to the creation of special crystalline morphologies (β-crystal form) and oriented structures under microinjection molding conditions, resulting in the improvement of tensile strength by ∼45 MPa.
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Zhao Z-G, Yang Q, Coates PD et al (2018) Structure and Property of Microinjection Molded Poly(lactic acid) with High Degree of Long Chain Branching. Industrial and Engineering Chemistry Research. 57(33): 11312-11322.
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