Structure and properties of ultra-high molecular weight bisphenol a polycarbonate synthesized by solid-state polymerization in amorphous microlayers

2014 ◽  
Vol 132 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
In Hak Baick ◽  
Woo Jic Yang ◽  
Yun Gyong Ahn ◽  
Kwang Ho Song ◽  
Kyu Yong Choi
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Bisphenol A ◽  
High Molecular Weight ◽  
Structure And Properties ◽  
Bisphenol A Polycarbonate ◽  
Solid State Polymerization ◽  
Ultra High Molecular Weight

Preparation and characterization of high molecular weight poly(trimethylene terephthalate) by solid-state polymerization

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Kim Seok Hoon ◽  
Kim Joon Ho
Keyword(s):  
Molecular Weight ◽  
Reaction Time ◽  
Solid State ◽  
High Molecular Weight ◽  
Melting Temperature ◽  
Average Molecular Weight ◽  
Pellet Size ◽  
Solid State Polymerization ◽  
Trimethylene Terephthalate ◽  
High Molecular Weight Poly

AbstractSolid-state polymerization has been widely used to prepare high molecular weight poly(ethylene terephthalate). Solid-state polymerization is generally carried out by heating solid, melt-phase-polymerized polymer below its melting temperature but above its glass transition temperature. Solid-state polymerization of poly(trimethylene terephthalate)(PTT) is not an independent process but rather an additional process with respect to melt polymerization that is used when PTT of a higher molecular weight is required. Two kinds of commercial PTT chips were polymerized in the solid state to prepare high molecular weight PTT, which were characterized by end group contents, molecular weight, thermal analysis and X-ray diffraction. In the solid-state polymerization of PTT, the overall reaction rate was governed by the reaction temperature, reaction time and pellet size. The content of carboxyl end groups was decreased during the solid-state polymerization with increasing reaction time and temperature. The melting temperature and crystallinity of solid-state-polymerized PTT were higher at longer times and higher temperatures of polymerization. The activation energy for the solid-state polymerization of PTT was in the range of 24~25 kcal/mol for each chip. Through the solid-state polymerization of commercial PTT chips, we could get high molecular weight polymers up to an intrinsic viscosity value of 1.63 dl/g, which is equivalent to about a 117,000 weight-average molecular weight.

High molecular weight bio furan-based co-polyesters for food packaging applications: synthesis, characterization and solid-state polymerization

2016 ◽  
Vol 18 (19) ◽  
pp. 5142-5150 ◽  
Author(s):  
Sungmin Hong ◽  
Kyung-Deok Min ◽  
Byeong-Uk Nam ◽  
O Ok Park
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
High Molecular Weight ◽  
Food Packaging ◽  
Melt Polycondensation ◽  
Solid State Polymerization

High molecular weight bio furan-based copolyesters have been synthesized by melt polycondensation and solid-state polymerization for packaging applications as bio based alternatives to PET.

Solid-state polymerization of poly(aryl carbonates): a facile route to high-molecular-weight polycarbonates

1993 ◽  
Vol 26 (5) ◽  
pp. 1186-1187 ◽  
Author(s):  
V. S. Iyer ◽  
J. C. Sehra ◽  
K. Ravindranath ◽  
S. Sivaram
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
High Molecular Weight ◽  
Solid State Polymerization ◽  
Facile Route

scholarly journals Particle morphology, structure and properties of nascent ultra-high molecular weight polyethylene

2020 ◽  
Vol 7 (8) ◽  
pp. 200663
Author(s):  
Wenyang Zhang ◽  
Zhengwen Wu ◽  
Hanjun Mao ◽  
Xinwei Wang ◽  
Jianlong Li ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
High Molecular Weight ◽  
Liquid Paraffin ◽  
Particle Morphology ◽  
Particle Growth ◽  
Structure And Properties ◽  
Uhmwpe Particle ◽  
Ultra High Molecular Weight ◽  
Polymerization Method

The effects of particle morphology on the structure and swelling/dissolution and rheological properties of nascent ultra-high molecular weight polyethylene (UHMWPE) in liquid paraffin (LP) were elaborately explored in this article. Nascent UHMWPE with different particle morphologies was prepared via pre-polymerization technique and direct polymerization. The melting temperature and crystallinity of UHMWPE resins with different particle morphologies were compared, and a schematic diagram was proposed to illustrate the mechanism of UHMWPE particle growth synthesized by pre-polymerization method and direct polymerization. The polymer globules in the nascent UHMWPE prepared by using pre-polymerization technique are densely packed and a positive correlation between the particle size and the viscosity-averaged molecular weight can be observed. The split phenomenon of particles and the fluctuation in the viscosity of UHMWPE/LP system prepared by direct polymerization can be observed at a low heating rate and there is no correlation between particle size and viscosity-averaged molecular weight.

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