scholarly journals Rheological behavior, crystallization properties, and foaming performance of chain-extended poly (lactic acid) by functionalized epoxy

RSC Advances ◽  
2021 ◽  
Vol 11 (52) ◽  
pp. 32799-32809
Author(s):  
Ming Li ◽  
Shengnan Li ◽  
Bujin Liu ◽  
Tuanhui Jiang ◽  
Di Zhang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Rheological Behavior ◽  
Chain Extension ◽  
Poly Lactic Acid ◽  
Crystallization Properties

The branched/micro-crosslinked structure formed by chain extension reaction between EGMA and PLA improved the rheological behavior and crystallization properties of PLA, which ameliorated the foaming performance of various PLA samples.

scholarly journals Poly(lactic Acid): A Versatile Biobased Polymer for the Future with Multifunctional Properties—From Monomer Synthesis, Polymerization Techniques and Molecular Weight Increase to PLA Applications

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1822
Author(s):  
Evangelia Balla ◽  
Vasileios Daniilidis ◽  
Georgia Karlioti ◽  
Theocharis Kalamas ◽  
Myrika Stefanidou ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Lactic Acid ◽  
Chain Extension ◽  
Poly Lactic Acid ◽  
Plastic Pollution ◽  
Practical Applications ◽  
Decomposition Reactions ◽  
Melt Polycondensation ◽  
Polymerization Conditions ◽  
Molecular Weight Increase

Environmental problems, such as global warming and plastic pollution have forced researchers to investigate alternatives for conventional plastics. Poly(lactic acid) (PLA), one of the well-known eco-friendly biodegradables and biobased polyesters, has been studied extensively and is considered to be a promising substitute to petroleum-based polymers. This review gives an inclusive overview of the current research of lactic acid and lactide dimer techniques along with the production of PLA from its monomers. Melt polycondensation as well as ring opening polymerization techniques are discussed, and the effect of various catalysts and polymerization conditions is thoroughly presented. Reaction mechanisms are also reviewed. However, due to the competitive decomposition reactions, in the most cases low or medium molecular weight (MW) of PLA, not exceeding 20,000–50,000 g/mol, are prepared. For this reason, additional procedures such as solid state polycondensation (SSP) and chain extension (CE) reaching MW ranging from 80,000 up to 250,000 g/mol are extensively investigated here. Lastly, numerous practical applications of PLA in various fields of industry, technical challenges and limitations of PLA use as well as its future perspectives are also reported in this review.

Microstructure, rheological behavior, and properties of poly(lactic acid)/poly(butylene succinate)/organoclay nanocomposites

2014 ◽  
Vol 131 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sophie Risse ◽  
Lan Tighzert ◽  
Françoise Berzin ◽  
Bruno Vergnes
Keyword(s):  
Lactic Acid ◽  
Rheological Behavior ◽  
Poly Lactic Acid ◽  
Butylene Succinate

Characteristics of poly(lactic acid) reinforced composites with waste cotton

2011 ◽  
Vol 31 (6-7) ◽  
Author(s):  
Xiuju Zhang ◽  
Juncai Shen ◽  
Tingting Yang ◽  
Bihua Ye ◽  
Zhidan Lin ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Lactic Acid ◽  
Impact Strength ◽  
Flexural Strength ◽  
Polylactic Acid ◽  
Resource Utilization ◽  
Cotton Cloth ◽  
Poly Lactic Acid ◽  
Reinforced Composites ◽  
Crystallization Properties

Abstract In this study, waste cotton cloth (RC) was bonded with soluble starches as an adhesive, then dried, cut into particles and filled into polylactic acid (PLA) to achieve resource efficiency. The mechanical, thermal and crystallization properties of the composites were characterized. The results indicated that with the addition of RC, the tensile strength, impact strength and flexural strength of PLA composites improved. Also, the heat distortion temperatures increased slowly, indicating that RC filled into PLA can be turned back into useful items without the degradation of PLA composites. This is a good way to give direction to the resource utilization of waste clothing. The addition of RC could significantly reduce the spherulitic size of PLA.

Synthesis and chain extension of hydroxyl-terminated poly(lactic acid) oligomers and application in the blends

2013 ◽  
Vol 34 (2) ◽  
pp. 305-312 ◽  
Author(s):  
Junshao Liu ◽  
Chen Peizhen ◽  
Huihua Jiang ◽  
Liangbi Chen
Keyword(s):  
Lactic Acid ◽  
Chain Extension ◽  
Poly Lactic Acid

Crystallization Properties of Nucleated Poly(lactic acid)

2012 ◽  
Vol 549 ◽  
pp. 322-326 ◽  
Author(s):  
Yong Chen ◽  
Qiang Dou
Keyword(s):  
Lactic Acid ◽  
Crystallization Behavior ◽  
Polarized Light ◽  
Nucleating Agent ◽  
Poly Lactic Acid ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Crystallization Properties ◽  
Melting And Crystallization

The effect of a nucleating agent (NT-C) on the crystallization behavior of poly(lactic acid) (PLA) was studied. The melting and crystallization behavior and spherulitic morphology of the nucleated PLA were investigated by means of differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and polarized light microscopy (PLM). It is found that the crystallization temperature and crystallinity increase, the spherulitic size decrease for the nucleated PLA. But the crystal structure of the nucleated PLA is not changed.

Graphene nanoplatelets as poly(lactic acid) modifier: linear rheological behavior and electrical conductivity

2013 ◽  
Vol 1 (28) ◽  
pp. 8253 ◽  
Author(s):  
Mohammad Sabzi ◽  
Long Jiang ◽  
Fei Liu ◽  
Ismail Ghasemi ◽  
Mohammad Atai
Keyword(s):  
Electrical Conductivity ◽  
Lactic Acid ◽  
Rheological Behavior ◽  
Graphene Nanoplatelets ◽  
Poly Lactic Acid
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