Significant glass transition temperature increase based on polyhedral oligomeric silsequioxane (POSS) copolymer through hydrogen bonding

2002 ◽  
Vol 48 (6) ◽  
pp. 469-474 ◽  
Author(s):  
Hongyao Xu ◽  
Shiao-Wei Kuo ◽  
Feng-Chih Chang
Keyword(s):  
Hydrogen Bonding ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Temperature Increase ◽  
Transition Temperature Increase

The abnormal behavior of polymers glass transition temperature increase and its mechanism

2012 ◽  
Vol 55 (5) ◽  
pp. 713-717 ◽  
Author(s):  
Xiang Wang ◽  
GuiCun Qi ◽  
XiaoHong Zhang ◽  
JianMing Gao ◽  
BingHai Li ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Temperature Increase ◽  
Abnormal Behavior ◽  
Transition Temperature Increase

Viscoelastic Behavior of Segmented Elastomers

1967 ◽  
Vol 40 (4) ◽  
pp. 1105-1110 ◽  
Author(s):  
Stuart L. Cooper ◽  
Arthur V. Tobolsky
Keyword(s):  
Hydrogen Bonding ◽  
Glass Transition ◽  
High Temperature ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Viscoelastic Behavior ◽  
Temperature Transition ◽  
Hydrogen Bonding Interactions ◽  
Structural Nature ◽  
Hard Segments

Abstract Viscoelastic behavior of linear segmented elastomers was examined. The unusual properties found in spandex systems are also observable in hydrocarbon block co-polymers, indicating that hydrogen bonding interactions are perhaps not essential. Low temperature properties of segmented systems are governed by the structural nature of the associated flexible segments, which determines the value of the major glass transition temperature (Tg). It appears that an association of the hard segments provides a broad temperature range of enhanced rubbery modulus. This occurs between the major Tg and a secondary high temperature transition.

An Experimental Study for Crystallization Characteristics of Nd-Based Alloy

2011 ◽  
Vol 268-270 ◽  
pp. 611-615
Author(s):  
Feng Yang ◽  
Zhi Hua Gao ◽  
Di Wang ◽  
Yang Liu
Keyword(s):  
Experimental Study ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Metallic Glass ◽  
Heating Temperature ◽  
Liquid Region ◽  
Magnetic Alloys ◽  
Ordinary Temperature ◽  
Transition Temperature Increase

The bulk metallic glass has received much attention from scientist and engineer. In this paper, we fabricated metallic glass of Nd-based and carried out experimental research. This kind of metallic glass has shown a distinct glass transition and stable super-cooled liquid region. At the same time, we find the paramagnetic performance of Nd-based metallic glass is different from other hard magnetic alloys at ordinary temperature. The DSC experiment indicate that the glass transition temperature increase with the heating temperature.

scholarly journals Glass Transition Behaviors of Poly (Vinyl Pyridine)/Poly (Vinyl Phenol) Revisited

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1153 ◽  
Author(s):  
Osamu Urakawa ◽  
Ayaka Yasue
Keyword(s):  
Molecular Weight ◽  
Hydrogen Bonding ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Chain ◽  
Molecular Weight Dependence ◽  
Vinyl Pyridine ◽  
The Difference ◽  
Vinyl Phenol

We examined the composition and molecular weight dependence of the glass transition temperature in detail for two types of hydrogen bonding miscible blends: poly (2-vinyl pyridine)/poly (vinyl phenol) (2VPy/VPh) and poly (4-vinyl pyridine)/poly (vinyl phenol) (4VPy/VPh). Regarding the functional form of the glass transition temperature, Tg, as a function of the weight fraction, we found a weak deviation from the Kwei equation for 2VPy/VPh blends. In contrast, such a deviation was not observed for the 4VPy/VPh blend. By relating the difference in the functional forms of Tg between the two blend systems to the difference in hydrogen bonding ability, we proposed a modified version of the Kwei equation. As for the interaction parameter, q in the Kwei equation, clear molecular weight dependence was observed for 2VPy/VPh blends: the lower the VPh molecular weight in the oligomer level, the higher the q values, suggesting the higher hydrogen bonding formability near the polymer chain ends than the middle part of a polymer chain.

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