Microwave Accelerated Polymerization of 2-Phenyl-5,6-dihydro-4H-1,3-oxazine: Kinetics and Influence of End-Groups on Glass Transition Temperature

2006 ◽  
Vol 27 (16) ◽  
pp. 1335-1340 ◽  
Author(s):  
Sebastian Sinnwell ◽  
Helmut Ritter
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
End Groups

Synthesis of Carbosilane Dendrimers with 2-Phenylethyl End Groups and Influence of Generation Number on Glass Transition Temperature of PS-based Composites

Silicon ◽  
2014 ◽  
Vol 7 (2) ◽  
pp. 155-164 ◽  
Author(s):  
Natalia A. Novozhilova ◽  
Olga A. Serenko ◽  
Vjacheslav I. Roldughin ◽  
Andrey A. Askadskii ◽  
Aziz M. Muzafarov
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Carbosilane Dendrimers ◽  
Generation Number ◽  
End Groups

Effects of End-Groups on Properties of Hyperbranched Polyether

2012 ◽  
Vol 488-489 ◽  
pp. 137-141
Author(s):  
Xue Jing Song ◽  
Yun Jun Luo
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Stearic Acid ◽  
Acid Ester ◽  
Chain Structure ◽  
Crystalline Region ◽  
Polar Groups ◽  
End Groups ◽  
Hyperbranched Polyether

In order to investigate influence of end-groups on thermodynamic property and viscosity of hyperbranched polyether. Three series of hyperbranched polyethers with three different end-groups were studied. These three groups are: hydroxyl, acetate and stearic acid ester. The result confirms the complicated effect of end-groups on properties of hyperbranched polymer. When end-groups change from polar groups of hydroxyl to non-polar groups of acetate, glass transition temperature reduced about 50°C, viscosity reduced sharply too. Glass transition temperature and viscosity all increase with generation rise. When end-groups change from acetate to stearic acid ester, corresponding hyperbranched polyether change from amorphous to crystalline. The crystallization stemmed from long chain structure of end-group, which is easy to form crystalline, its crystalline region molten become main thermodynamic transformation, and obscure the glass transition.

Sign in / Sign up

Export Citation Format

Share Document