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Influence of the admicelled poly(methyl methacrylate) on the compatibility and toughness of poly(lactic acid)

Published online by Cambridge University Press:  04 March 2018

Angkana Pongpilaipruet  and
Rathanawan Magaraphan Open the ORCID record for Rathanawan Magaraphan [Opens in a new window]
Angkana Pongpilaipruet
Affiliation:
Polymer Processing and Polymer Nanomaterials Research Unit, The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand
Rathanawan Magaraphan*
Affiliation:
Polymer Processing and Polymer Nanomaterials Research Unit, The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand
*
a)Address all correspondence to this author. e-mail: rathanawan.k@chula.ac.th
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Abstract

Admicellar polymerization, a novel technique for surface modification, was used in this work to enhance the compatibility between polymers with obviously different polarities, e.g., natural rubber (NR) and polylactic acid (PLA). The admicellar polymerization of methyl methacrylate over NR substrates (using potassium peroxodisulfate as an initiator) so-called poly(methyl methacrylate)–natural rubber (PMMA-ad-NR) was prepared and mixed with PLA at different contents (5, 10, and 15 wt%) in comparison to the simple PLA/NR blends. The monomer to initiator ratio was varied: 25:1, 50:1, and 100:1 corresponding to the admicelled PMMA molecular weight of 20,000, 30,000, and 40,000 g/mol, respectively. All PLA/PMMA-ad-NR blends showed good compatibility as evident by FE-SEM results revealing smooth boundary of PMMA-ad-NR domains in the PLA matrix. Moreover, the mechanical properties and thermal stability of PLA/PMMA-ad-NR blends were higher than those of PLA/NR blends, especially with increasing PMMA-ad-NR content up to 10 wt%. It was clear that the lowest molecular weight of the admicelled PMMA gave the highest toughness of PLA/PMMA-ad-NR blends.

Keywords

blendpolymerpolymerization
Type
Articles
Information
Journal of Materials Research , Volume 33 , Issue 6 , 28 March 2018 , pp. 662 - 673
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Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Amit Bandyopadhyay

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