Effect of Two‐Step Chain Extension using Joncryl and PMDA on the Rheological Properties of Poly (lactic acid)

2019 ◽  
Vol 305 (2) ◽  
pp. 1900423 ◽  
Author(s):  
Nasrin Yahyaee ◽  
Azizeh Javadi ◽  
Hamid Garmabi ◽  
Amir Khaki
Keyword(s):  
Lactic Acid ◽  
Rheological Properties ◽  
Chain Extension ◽  
Poly Lactic Acid

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.

Rheological Properties of Starch-Based Materials and Starch/Poly(lactic acid) Blends

2007 ◽  
Vol 249-250 (1) ◽  
pp. 529-534 ◽  
Author(s):  
Fengwei Xie ◽  
Tao Xue ◽  
Long Yu ◽  
Ling Chen ◽  
Xiaoxi Li ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Rheological Properties ◽  
Poly Lactic Acid

Thermal, mechanical and rheological properties of poly (lactic acid)/epoxidized soybean oil blends

2008 ◽  
Vol 62 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Fathilah Ali ◽  
Young-Wook Chang ◽  
Shin Choon Kang ◽  
Joon Yong Yoon
Keyword(s):  
Lactic Acid ◽  
Soybean Oil ◽  
Rheological Properties ◽  
Epoxidized Soybean Oil ◽  
Poly Lactic Acid ◽  
Oil Blends

The role of multiwall carbon nanotubes on physical, mechanical and rheological properties of poly(lactic acid)/natural rubber/CNT hybrid systems

2020 ◽  
pp. 096739112093135
Author(s):  
Mohammad Mahdi Salehi ◽  
Fatemeh Hakkak
Keyword(s):  
Lactic Acid ◽  
Natural Rubber ◽  
Rheological Properties ◽  
Droplet Size ◽  
Multiwall Carbon Nanotubes ◽  
Droplet Size Distribution ◽  
Hybrid Nanocomposites ◽  
Poly Lactic Acid ◽  
Melt Mixing

The main objective of the present work was to study the role of carbon nanotube (CNT) on the microstructure development and physical, mechanical, and rheological properties of poly(lactic acid) (PLA)/natural rubber (NR)/CNT hybrid nanocomposites. The PLA/NR blend samples with constant blend ratio (90/10) were prepared by melt mixing in a laboratory internal mixer at a temperature of 190°C. The behavior of the PLA/NR blend was examined depending on the CNT content (0.5–6 wt%). The droplet size and droplet size distribution of the NR phase decreases with the increase in CNTs content. This could be explained in terms of compatibilizing effect of CNT and the changing of the viscosity ratio of the blend phases. The development of the microstructure and the physical properties of the blend were also investigated according to the CNT contents by measuring the linear viscoelasticity. The elongational behavior and mechanical properties of the blends were strongly dependent on the location of the CNT. The CNT worked as an efficient compatibilizer and also it worked as a reinforcing filler making the matrix more rigid.

Rheological Properties of Poly(lactic acid) Modified by Contents of Epoxy Group in Chain Extender

Polymer Korea ◽  
2018 ◽  
Vol 42 (3) ◽  
pp. 394-399
Author(s):  
Jae O Park ◽  
Woo Jin Choi ◽  
Kwang Je Kim ◽  
Jae Heung Lee ◽  
Jae Sup Shin
Keyword(s):  
Lactic Acid ◽  
Rheological Properties ◽  
Epoxy Group ◽  
Chain Extender ◽  
Poly Lactic Acid

Effect of blending conditions on mechanical, thermal, and rheological properties of plasticized poly(lactic acid)/maleated thermoplastic starch blends

2011 ◽  
Vol 124 (2) ◽  
pp. 1012-1019 ◽  
Author(s):  
J. Wootthikanokkhan ◽  
N. Wongta ◽  
N. Sombatsompop ◽  
A. Kositchaiyong ◽  
J. Wong-On ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Rheological Properties ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid ◽  
Starch Blends
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