Yes / 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. / Chinese Scholarship Council
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/16981 |
| Date | 27 July 2018 |
| Creators | Zhao, Z.-G., Yang, Q., Coates, Philip D., Whiteside, Benjamin R., Kelly, Adrian L., Huang, Y.-J., Wu, P.-P. |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Article, Accepted manuscript |
| Rights | © 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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