Synchronized Tandem Catalysis of Living Radical Polymerization and Transesterification: Methacrylate Gradient Copolymers with Extremely Broad Glass Transition Temperature

2013 ◽  
Vol 2 (11) ◽  
pp. 985-989 ◽  
Author(s):  
Yusuke Ogura ◽  
Takaya Terashima ◽  
Mitsuo Sawamoto
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Radical Polymerization ◽  
Living Radical Polymerization ◽  
Tandem Catalysis ◽  
Gradient Copolymers

Scale-up of Poly[(Vinyl Chloride)-b-(n-Butyl Acrylate)-b-(Vinyl Chloride)] prepared by Living Radical Polymerization

2006 ◽  
Vol 514-516 ◽  
pp. 975-979 ◽  
Author(s):  
Jorge F.J. Coelho ◽  
Patricia Alves ◽  
Joana Monteiro ◽  
M. Margarida C.A. Castro ◽  
Mariana Abreu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Radical Polymerization ◽  
Vinyl Chloride ◽  
Scale Up ◽  
Living Radical Polymerization ◽  
Poly Vinyl Chloride

Vinyl Chloride (VCM) based copolymers were synthesised by using Living Radical Polymerization. The obtained materials were characterized by determining their molecular weight, glass transition temperature and mechanical properties after processing in industrial equipments. Their chemical composition was evaluated by using NMR.

Synthesis of fluorinated gradient copolymers via in situ transesterification with fluoroalcohols in tandem living radical polymerization

2017 ◽  
Vol 8 (15) ◽  
pp. 2299-2308 ◽  
Author(s):  
Yusuke Ogura ◽  
Takaya Terashima ◽  
Mitsuo Sawamoto
Keyword(s):  
Methyl Methacrylate ◽  
Radical Polymerization ◽  
Living Radical Polymerization ◽  
Titanium Alkoxide ◽  
Tandem Catalysis ◽  
In Situ Transesterification ◽  
Gradient Copolymers

Fluorinated gradient copolymers were synthesized by the tandem catalysis of ruthenium-catalyzed living radical polymerization and titanium alkoxide-mediated transesterification of methyl methacrylate (MMA) with fluoroalcohols.

Investigation into the Thermal and Mechanical Behavior of PMMA/Alumina Nanocomposites

2000 ◽  
Vol 661 ◽  
Author(s):  
Benjamin J. Ash ◽  
Jason Stone ◽  
Diana F. Rogers ◽  
Linda S. Schadler ◽  
Richard W. Siegel ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Free Radical ◽  
Glass Transition Temperature ◽  
Mechanical Behavior ◽  
Radical Polymerization ◽  
Ultimate Strength ◽  
Yield Point ◽  
Free Radical Polymerization ◽  
Average Increase

ABSTRACTPolymethylmethacrylate (PMMA) nanocomposites were synthesized by free radical polymerization in the presence of various weight percentages of alumina (Al2O3) nanoparticles. The resulting nanocomposites show an average increase of 600% in strain-to-failure and the appearance of a well-defined yield point. Concurrently, the glass transition temperature (Tg) of the composites decreased 20°C, while the ultimate strength and the Young's modulus decreased by 20% and 15%, respectively.

scholarly journals Influence of the Glass Transition Temperature and the Density of Crosslinking Groups on the Reversibility of Diels-Alder Polymer Networks

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1189
Author(s):  
Merlina Thiessen ◽  
Volker Abetz
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Radical Polymerization ◽  
Polymer Networks ◽  
Alder Reaction ◽  
Diels Alder ◽  
Self Healing ◽  
Scanning Calorimetry ◽  
Diels Alder Reaction

The interest in self-healing, recyclable, and adaptable polymers is growing. This work addresses the reversibility of crosslink formation based on Diels-Alder reaction in copolymer networks containing furfuryl and maleimide groups, which represent the “diene” and the “dienophile,” respectively. The copolymers are synthesized by atom transfer radical polymerization (ATRP) and free radical polymerization. The diene bearing copolymers are crosslinked either with a small molecule containing two dienophiles or with a dienophile bearing copolymer. The influence of the crosslinking temperature on the Diels-Alder reaction is analyzed. Furthermore, the influence of the glass transition temperature and the influence of the density of crosslinking groups on the thermo-reversibility of crosslinking are investigated by temperature dependent infrared spectroscopy and differential scanning calorimetry. It is shown that the reversibility of crosslinking is strongly influenced by the glass transition temperature of the system.

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