Thermal Property Measurement of Polymer Materials

2012 ◽  
Vol 591-593 ◽  
pp. 1089-1093
Author(s):  
Jiong Shiun Hsu ◽  
Bor Jiunn Wen ◽  
Liang Jian Chang
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Property ◽  
Optical Method ◽  
Measurement Method ◽  
Optical Measurement ◽  
Polymer Materials ◽  
Full Field ◽  
Property Measurement

Glass transition temperature is an important thermal property for polymer materials. When its temperature exceeds this temperature, the exhibiting characters dramatically changes. Although the experimental techniques suited to this temperature measurement are well-established, the full-field optical measurement method has not been employed to characterize this property. Therefore, this paper aims to measure the glass transition temperature using optical method.

Study of the effect of the reinforcement direction on the identification of relaxation transitions of moisture-saturated carbon fiber VKU-25

2021 ◽  
Vol 87 (9) ◽  
pp. 38-43
Author(s):  
O. G. Ospennikova ◽  
P. S. Marakhovsky ◽  
N. N. Vorobyov ◽  
E. V. Nikolaev ◽  
A. I. Gulyaev ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Carbon Fiber ◽  
Polymer Matrix ◽  
Structural Parameters ◽  
Polymer Materials ◽  
Thermal Coefficient ◽  
Initial State ◽  
Relaxation Transitions

Thermodilatometric methods of analysis are used to study the structural parameters of polymer materials, however, when studying moisture-saturated compositions certain difficulties arise in their identification. The results of thermophysical tests of VKU-25 carbon fiber samples in the initial state and after moisture saturation are presented. It is shown that heat treatment of materials affects the recorded values of the glass transition temperature of the epoxy matrix. When the samples are exposed in water or above the water surface, the sorbate penetrates into the polymer at the same rate, which is confirmed by almost identical values of water absorption at the same exposure time. The estimates of the thermal coefficient of linear expansion (TCLE) of the samples in the range of 20 - 250°C are given. Moreover, it is shown that the glass transition temperature of the plasticized polymer matrix depends on the direction of fiber reinforcement. In the case of moisture-saturated carbon fiber (CF)heated to 210°C, the formation of main cracks occurs mainly at the fiber-matrix interface. The glass transition temperature (GTT) of the material in the dry state (176 - 177°C), appeared almost independent on the heating rate, whereas for water-saturated samples, GTT changes significantly and can be described by a polynomial of the 2nd order. After exposure of the carbon fiber under conditions of high temperature and humidity, two relaxation transitions corresponding to the systems occur in the polymer matrix: epoxidian oligomer— amine hardener and polyfunctional resin— amine hardener. The glass transition temperature is 132 and 159°C in the first and in the second, respectively. The results obtained can be used in the development of new polymer composite materials.

Improving the flame retardancy and thermal property of organotitanate-modified epoxy resin for electronic application via a simple method

2017 ◽  
Vol 31 (1) ◽  
pp. 12-23 ◽  
Author(s):  
Birong Zeng ◽  
Li Yang ◽  
Jinmei Chen ◽  
Xinyu Liu ◽  
Haiyang Wu ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Property ◽  
Heat Release ◽  
Flame Retardancy ◽  
Synergistic Effects ◽  
Mechanical And Thermal Properties ◽  
Simple Method ◽  
Limiting Oxygen Index

The development of halogen-free epoxy resins (EPs) has become a major concern in the field of electronic packaging materials because flame retardants containing halogen release toxic chemicals during combustion. In this article, a type of modified EP possessing multiple functionalities, including high flame retardancy and thermal property as well as low hygroscopicity, was prepared via a simple method by taking advantage of synergistic effects of organotitanate and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The mechanical and thermal properties of the as-prepared EP/titanium (Ti)/DOPO system were characterized by dynamic mechanical analysis, glass transition temperature, differential scanning calorimetry, and so on. The results showed that the incorporation of organotitanate and DOPO into EP can not only enhance the decomposition temperature and residual char but also increase the glass transition temperature and limiting oxygen index (LOI) value. The EP/Ti/DOPO system reached UL94 V-0 rating with an LOI of 34.7%. Compared to pure epoxy, the peak heat release rate, heat release capacity, and total heat release of EP/Ti/DOPO were decreased by 33.3%, 35.1%, and 16.7%, respectively.

The Thermal Property of Soybean Protein–PVA Fibers

2010 ◽  
Vol 44-47 ◽  
pp. 3011-3015
Author(s):  
Qing Bin Yang ◽  
Yi Xin Liu ◽  
Lin Tian ◽  
Yu Kun Dou
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Property ◽  
Soybean Protein ◽  
Decomposition Temperature ◽  
Shrinkage Rate ◽  
Dry Air ◽  
End Use ◽  
Pva Fiber

In order to analysis the processing and serviceability of soybean protein-PVA fibers, the thermal property is studied by TG and DSC and other methods. The result is compared with that of the wool. The glass transition temperature of soybean protein-PVA fiber is 81°C.The decomposition temperature is 313°C.The heat dry air shrinkage rate is 2.3%. The heat endurance meets with the demand of processing and end use.

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