Microcellular foaming of poly(lactic acid) branched with food‐grade chain extenders

2021 ◽  
Vol 138 (29) ◽  
pp. 50686
Author(s):  
Krishnaa B. Venkatesan ◽  
Sonal S. Karkhanis ◽  
Laurent M. Matuana
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Food Grade ◽  
Microcellular Foaming ◽  
Chain Extenders

scholarly journals Chemical foaming extrusion of poly(lactic acid) with chain-extenders: Physical and morphological characterizations

2015 ◽  
Vol 67 ◽  
pp. 40-49 ◽  
Author(s):  
J.M. Julien ◽  
J.-C. Quantin ◽  
J.-C. Bénézet ◽  
A. Bergeret ◽  
M.F. Lacrampe ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Chain Extenders ◽  
Chemical Foaming

scholarly journals Crystallization-induced microcellular foaming of poly (lactic acid) with high volume expansion ratio

2017 ◽  
Vol 144 ◽  
pp. 231-240 ◽  
Author(s):  
Peng Chen ◽  
Wenbo Wang ◽  
Yaqiao Wang ◽  
Kesong Yu ◽  
Hongfu Zhou ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Volume Expansion ◽  
High Volume ◽  
Expansion Ratio ◽  
Poly Lactic Acid ◽  
Microcellular Foaming

scholarly journals Improving Recycled Poly(lactic Acid) Biopolymer Properties by Chain Extension Using Block Copolymers Synthesized by Nitroxide-Mediated Polymerization (NMP)

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2791
Author(s):  
Juan José Benvenuta-Tapia ◽  
Pascale Champagne ◽  
José Alfredo Tenorio-López ◽  
Eduardo Vivaldo-Lima ◽  
Ramiro Guerrero-Santos
Keyword(s):  
Lactic Acid ◽  
Block Copolymers ◽  
Molar Mass ◽  
Average Molecular Weight ◽  
Melt Processing ◽  
Cold Crystallization ◽  
Chain Extension ◽  
Poly Lactic Acid ◽  
Chain Extenders ◽  
Nitroxide Mediated Polymerization

The aim of this contribution is to assess the use poly(styrene-co-glycidyl methacrylate-b-styrene) copolymers synthesized by nitroxide mediated polymerization (NMP) as chain extenders in the recycling of poly(lactic acid) biopolyester. Concisely, the addition of such block copolymers during the melt processing of recycled poly(lactic acid) (rPLA) leads to important increases in the viscosity average molecular weight of modified polymeric materials. Molar masses increase from 31,000 g/mol for rPLA to 48,000 g mol−1 for the resulting rPLA/copolymer blends (bPLA). Fortuitously, this last value is nearly the same as the one for pristine PLA, which constitutes a first piece of evidence of the molar mass increase of the recycled biopolymer. Thermograms of chain extended rPLA show significant decreases in cold crystallization temperature and higher crystallinity degrees due to the chain extension process using NMP-synthesized copolymers. It was found that increasing epoxide content in the NMP-synthesized copolymers leads to increased degrees of crystallinity and lower cold crystallization temperatures. The rheological appraisal has shown that the addition of NMP synthesized copolymers markedly increases complex viscosity and elastic modulus of rPLA. Our results indicate that P(S-co-GMA)-b-S) copolymers act as efficient chain extenders of rPLA, likely due to the reaction between the epoxy groups present in P(S-co-GMA)-b-PS and the carboxyl acid groups present in rPLA. This reaction positively affects viscometric molar mass of PLA and its performance.

scholarly journals Appraisal of ε‐Caprolactam and Trimellitic Anhydride Potential as Novel Chain Extenders for Poly(lactic acid)

2020 ◽  
Vol 60 (5) ◽  
pp. 944-955
Author(s):  
Imane Mayouf ◽  
Melia Guessoum ◽  
Mónica Fuensanta ◽  
José Miguel Martín Martìnez
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Trimellitic Anhydride ◽  
Chain Extenders
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