Homopolymerization and copolymerization kinetics of trimethylene carbonate bearing a methoxyethoxy side group

2015 ◽  
Vol 54 (4) ◽  
pp. 544-552 ◽  
Author(s):  
Fei Chen ◽  
Brian G. Amsden
Keyword(s):  
Side Group ◽  
Trimethylene Carbonate ◽  
Kinetics Of ◽  
Copolymerization Kinetics

scholarly journals Fast-Scanning Chip-Calorimetry Measurement of Crystallization Kinetics of Poly(Glycolic Acid)

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 891
Author(s):  
Yongxuan Chen ◽  
Kefeng Xie ◽  
Yucheng He ◽  
Wenbing Hu
Keyword(s):  
Crystallization Kinetics ◽  
Temperature Region ◽  
Glycolic Acid ◽  
Crystal Nucleation ◽  
Side Group ◽  
Half Time ◽  
Temperature Range ◽  
Chip Calorimetry ◽  
Kinetics Of ◽  
Fast Scanning Chip Calorimetry

We report fast-scanning chip-calorimetry measurement of isothermal crystallization kinetics of poly(glycolic acid) (PGA) in a broad temperature range. We observed that PGA crystallization could be suppressed by cooling rates beyond -100 K s−1 and, after fast cooling, by heating rates beyond 50 K s-1. In addition, the parabolic curve of crystallization half-time versus crystallization temperature shows that PGA crystallizes the fastest at 130 °C with the minimum crystallization half-time of 4.28 s. We compared our results to those of poly(L-lactic acid) (PLLA) with nearby molecular weights previously reported by Androsch et al. We found that PGA crystallizes generally more quickly than PLLA. In comparison to PLLA, PGA has a much smaller hydrogen side group than the methyl side group in PLLA; therefore, crystal nucleation is favored by the higher molecular mobility of PGA in the low temperature region as well as by the denser molecular packing of PGA in the high temperature region, and the two factors together decide the higher crystallization rates of PGA in the whole temperature range.

Copolymerization Kinetics of Styrene and Divinylbenzene in the Presence of S-Thiobenzoyl Thioglycolic Acid as RAFT Agent

2010 ◽  
Vol 33 (11) ◽  
pp. 1893-1899 ◽  
Author(s):  
M. Roa-Luna ◽  
G. Jaramillo-Soto ◽  
P. V. Castañeda-Flores ◽  
E. Vivaldo-Lima
Keyword(s):  
Thioglycolic Acid ◽  
Raft Agent ◽  
Kinetics Of ◽  
Copolymerization Kinetics

Kinetics of the radical copolymerization of styrene and 2-methoxyethyl methacrylate

1983 ◽  
Vol 48 (9) ◽  
pp. 2656-2665 ◽  
Author(s):  
Jaroslav Stejskal ◽  
Dagmar Straková ◽  
Ondřej Procházka ◽  
Pavel Kratochvíl
Keyword(s):  
Experimental Data ◽  
Molecular Weight ◽  
Kinetic Data ◽  
Radical Copolymerization ◽  
Copolymer Composition ◽  
Monomer Mixture ◽  
Diffusion Controlled ◽  
Kinetics Of ◽  
Best Fit ◽  
Copolymerization Kinetics

Twenty low-conversion statistical copolymers of styrene and 2-methoxyethyl methacrylate with various composition were prepared. The dependence of the copolymer composition, molecular weight, initiation efficiency and other parameters on the composition of the monomer mixture is discussed. Kinetic data are correlated by means of various models of the copolymerization kinetics. The best fit with experimental data is provided by a diffusion-controlled termination model, especially its dyad variant suggested in this study.

Kinetics of mesophase transitions in thermotropic copolyesters. 4. Pendant side-group effect

1991 ◽  
Vol 24 (1) ◽  
pp. 150-157 ◽  
Author(s):  
Stephen Z. D. Cheng ◽  
Ronald L. Johnson ◽  
Zongquan Wu ◽  
Hak Hung Wu
Keyword(s):  
Group Effect ◽  
Side Group ◽  
Kinetics Of ◽  
Thermotropic Copolyesters

Copolymerization Kinetics of Polyetyhylenglycol Allylether Type Polycarboxylate Superplasticizer

2014 ◽  
Vol 936 ◽  
pp. 1393-1398 ◽  
Author(s):  
Ying Feng Tian ◽  
Xia Ping Zhu ◽  
Ya Ting Deng ◽  
Kui Wang
Keyword(s):  
Ammonium Persulfate ◽  
Radical Copolymerization ◽  
Polymerization Reaction ◽  
Molar Ratio ◽  
Free Radical Copolymerization ◽  
H Nmr ◽  
Polycarboxylate Superplasticizer ◽  
Relationship Of ◽  
Kinetics Of ◽  
Copolymerization Kinetics

The free radical copolymerization kinetics of polyethylenglycol allylether (APEG) with acrylic acid (AA) had been studied in aqueous solution through using ammonium persulfate (APS) and 30% hydrogen peroxide (H2O2) as initiators. The structure of polycarboxylate superplasticizer had been characterized by IR and 1H-NMR. The rate of copolymerization was proportional to the molar ratio of monomers (AA:APEG) to the power of 0.4405, and to the amount of initiator (1.5%APS-2%H2O2, mass ratio to monomers) to the power of 0.7819, respectively. The overall observed activation energy of copolymerization was 45.048 kJ/mol. The kinetic relationship of copolymerization reaction of APEG with AA had been established as follow: Rp∝[APEG/AA]0.4405[APS-30%H2O2]0.7819e-5418/T. The temperature and initiator were main influencing factors on polymerization reaction.

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