Search Results
transition temperature of the uncured components of the mixture ( T g0 ). The glass transition temperature of the completely cured EP system was designated as T g∞ and determined during the second heating mode. Since the dynamically cured samples did not
resistance of the polymer to an influence of low temperatures. From the analysis of DSC data of the synthesized PMVBSs, it results that their glass transition temperatures ( T g ) are different ( Table 5 ), but they are distinctly lower than those for
strong compacts [ 15 ]. Moreover the analysis of effect of water on bulk polymer properties is fundamental for many activities related to coating technology [ 16 ], like the prediction of glass transition temperature, T g [ 17 ]. The correlation between
Abstract
Amorphization is nowadays a method that is frequently applied in the pharmaceutical industry. The primary aim of this study is to achieve the amorphization of clopidogrel hydrogen sulphate as an active pharmaceutical ingredient (API) with various solvents and to choose the most suitable one. A secondary aim was to determine the glass-transition temperature (T g) of this API and to classify it as a good or poor glass former. To investigate the amorphous form, differential scanning calorimetry, X-ray powder diffraction, and FT-IR analysis were applied. The melting point (T m) was 177.4 °C (450.6 K), and T g was determined to be 88.9 °C (362.1 K). The quotient T g/T m was 0.80, and this API was therefore classified as a good glass former.
materials with higher glass transition temperature, hardness, and chemical resistance comparing to those aliphatic based [ 3 , 4 ]. The incorporation of cycloaliphatic rings into polymer backbone surely improves the thermal stability, transparency, glass
Thermal properties and combustibility of cross-linked XNBR/CSM blends
Part II. Influence of the CSM kind
maintains its elastic properties, is Δ T = −31 ÷ 263 °C, where T = −31 °C is its glass transition temperature ( T g ) and T = 263 °C is the temperature of the beginning of its cross-linking ( T c ) ( Table 1 ; Fig. 2 ). The range of temperature, at
x is less than 34 mol% [ 1 ], as well as glasses from P 2 O 5 –Na 2 O–CuO system [ 3 ] caused increase of the glass transition temperature T g due to depolimeryzation of the glass network on smaller units which in turn combined by P–O–Cu bonds and
of various resins for different applications. The introduction of cycloaliphatic groups into polymer structure often improves the thermal stability, mechanical performance, transparency, and glass transition temperature. The flexibility of cured
shock cooling from the melt) above the glass transition temperature [ 12 , 26 ]. This procedure carried out for all compounds. The DSC scans for compound 3 are showed on Fig. 4 . In the first step, a sample is heated above melting temperature
sulfur or dicumyl peroxide does not change the character of its thermal processes under a neutral gas ( Figs. 9 , 10 ). Under the influence of the lateral sulfide bonds the glass transition temperature ( T g ) of the elastomer is increased ( Table 4
