Influence of the photoinitiating system on the properties of photopolymerized methylmethacrylate: the role of the ketyl radical in type II photoinitiators

2021 ◽  
Author(s):  
V. Charlot ◽  
A. Ibrahim ◽  
M. Bessières ◽  
C. Croutxé-Barghorn ◽  
C. Delaite ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Type Ii ◽  
Ketyl Radical

The photopolymerization of methylmethacrylate using different initiating systems strongly affects its glass transition temperature and dispersity.

Investigating the role of GeO2 in enhancing the thermal stability and proton mobility of proton-conducting phosphate glasses

2021 ◽  
Author(s):  
Takahisa Omata ◽  
Aman Sharma ◽  
Takuya Kinoshita ◽  
Issei Suzuki ◽  
Tomohiro Ishiyama ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Phosphate Glasses ◽  
Proton Mobility ◽  
Proton Conducting

In this study, the effect of GeO2 on the thermal stability and proton mobility (μH) of proton-conducting phosphate glasses was experimentally investigated using 22HO1/2−3NaO1/2−(12−x)LaO3/2−xGeO2−63PO5/2 glasses. Increasing glass transition temperature (Tg)...

Rubber adhesion below the glass transition temperature: Role of frozen-in elastic deformation

2017 ◽  
Vol 120 (3) ◽  
pp. 36002 ◽  
Author(s):  
A.G. Akulichev ◽  
A. Tiwari ◽  
L. Dorogin ◽  
A. T. Echtermeyer ◽  
B. N. J. Persson
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Elastic Deformation

Raising glass transition temperature of polymer nanofilms as a function of negative interface energy

2019 ◽  
Vol 21 (9) ◽  
pp. 5224-5231
Author(s):  
Xue Yao ◽  
Yaru Wang ◽  
Xingyou Lang ◽  
Yongfu Zhu ◽  
Qing Jiang
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Interface Energy ◽  
Carbon Chain ◽  
Thermodynamic Approach

Based on a thermodynamic approach, glass transition temperature (Tg) of substrate-supported polymer nanofilms (s-PNFs) is investigated for carbon-chain polymers, taking the role of the interface energy into consideration.

Thermal Properties of Hyperbranched Polymer/HTPB-PU IPN

2013 ◽  
Vol 575-576 ◽  
pp. 76-80
Author(s):  
Xue Jing Song ◽  
Yun Jun Luo
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Melting Point ◽  
Hyperbranched Polymer ◽  
Isophorone Diisocyanate ◽  
Scanning Calorimetry

Hyperbranched polymer/HTPB-PU IPNs were prepared, when HTPB (hydroxyl-terminated polybutadiene) and IPDI (isophorone diisocyanate) were cured into polyurethane (HTPB-PU) at the existence of hyperbranched polymer. Differential scanning calorimetry (DSC) was adopted to study the influence of hyperbranched polymer on thermal properties of HTPB-PU, while IPNs were formed. The result shows that the existance of hyperbranched polymer makes glass transition temperature of HTPB-PU reduces by around 2°C and that HTPB-PU lowers the melting point of hyperbranched polymer. Hyperbranched polymer plays a role of internal plasticization on HTPB-PU, and HTPB-PU influences crystallization of hyperbranched polymer in return.

The role of long relaxation times in a simple model with massless modes

2018 ◽  
Vol 96 (8) ◽  
pp. 912-918 ◽  
Author(s):  
R. Timmons ◽  
K. De’Bell
Keyword(s):  
Monte Carlo ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Relaxation Times ◽  
Critical Ratio ◽  
Nearest Neighbour ◽  
Temperature Dependent ◽  
Dependent Behaviour

The next-nearest-neighbour Ising model with competing nearest-neighbour (nn) and next-nearest-neighbour (nnn) interactions, provides an example of a system in which massless modes destroy order at any finite temperature. This occurs only at a critical ratio, Kc, of the nnn and nn interactions. In this paper we investigate the role of long relaxation times in determining the behaviour of the system when the ratio of the nnn and nn interactions, K, is at and close to this critical ratio. Despite the absence of an order–disorder transition in systems with K = Kc, in Monte Carlo simulations reported here the temperature-dependent behaviour of the relaxation times indicates the existence of a glass transition with a glass transition temperature of Tg ≈ 0.26 in a model with nn interaction J = kB = 1.

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