Study diffusion effects on chain extension reactions based on the reptation theory

Polymer ◽  
2006 ◽  
Vol 47 (10) ◽  
pp. 3696-3704 ◽  
Author(s):  
Li-Tang Yan ◽  
Bao-Hua Guo ◽  
Jun Xu ◽  
Xu-Ming Xie
Keyword(s):  
Chain Extension ◽  
Diffusion Effects ◽  
Reptation Theory

Monte Carlo simulation of diffusion effects on chain-extension reactions

2006 ◽  
Vol 44 (19) ◽  
pp. 2902-2911 ◽  
Author(s):  
Li-Tang Yan ◽  
Bao-Hua Guo ◽  
Jun Xu ◽  
Xu-Ming Xie
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Chain Extension ◽  
Diffusion Effects

Chemical Reaction and Thermo Diffusion Effects on Hydro Magnetic Flow of Rivlin-Erickson Fluid in an Inclined Channel

2015 ◽  
Vol 4 (2) ◽  
pp. 37-50 ◽  
Author(s):  
V.Prabhakara Reddy ◽  
◽  
RAMACHANDRUNI V M S S KIRAN KUMAR ◽  
G.Viswanatha Reddy ◽  
P.Durga Prasad ◽  
...  
Keyword(s):  
Chemical Reaction ◽  
Inclined Channel ◽  
Magnetic Flow ◽  
Diffusion Effects

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.

Polymer entanglement drives formation of fibers from stable liquid bridges of highly viscous dextran solutions

Soft Matter ◽  
2021 ◽  
Author(s):  
Gurkaran Chowdhry ◽  
Yi Ming Chang ◽  
John P. Frampton ◽  
Laurent Kreplak
Keyword(s):  
Polymer Fibers ◽  
Liquid Bridges ◽  
Reptation Theory ◽  
Polymer Entanglement

Reptation theory explains the formation of 10 cm long polymer fibers from stable liquid bridges.

Shear‐sensitive chain extension of dissolved poly(ethylene oxide) by aluminate ions

2020 ◽  
Author(s):  
Satyam Srivastava ◽  
Zachary Fink ◽  
Elizabeth G. Burns ◽  
Thomas P. Russell ◽  
David A. Hoagland
Keyword(s):  
Ethylene Oxide ◽  
Chain Extension ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene
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