Class-transition temperature

Figure 6.1.5 Class transition temperature Tg (a) and signal-to-noise ratio S/N (m) of the hr-MAS NMR spectra of the C11 -SnCIs catalyst, as a function of the number of successive transesterification runs subsequent thorough Soxhiet extraction of the sample after the tenth run (k , on the right vertical axis). Short-dashed and long-dashed lines show the Increasing Tg and decreasing S/N trends upon increasing number of catalytic runs. (Reprinted with permission from Organometallics 2007, 26, 6718-6725. Copyright (2007) American Chemical Society)...

Amorphous Sucrose Water Content, Estimated Class Transition Temperature, and Induction Time for Crystallization for Samples Stored at the Indicated RH Values (25°C)... 

Class transition temperature (abbreviated Tg) A temperature or temperature range characteristic for polymers, below which they are in a hard/brittle state. Usually connected with a radical change of mechanical and physical properties of the polymers. Thermoplastics pass to the flow, respectively, melting range via plastic range. 

Class Transition Temperatures for Atactic Polymers of the General Type -(-CH CXYV... 

Table 1. Class Transition Temperature and Oxygen Penneability of Oligodimethylsiloxanyl Substituted Polymers...

Heating Rate Dependence of Class-Transition Temperature... 

Class Transition Temperatures and Change in Specific Heat Through the Glass Transition Binary Polymer Blends of PAr in... 

In homopolymers, physical properties are to some extent dependent on molar mass. Class transition temperature and various mechanical properties will increase with molar mass and eventually reach some sort of plateau value. The same is of course tme for a (statistical) copolymer, but in the case of a copolymer there is an additional degree of freedom. The copolymer composition may have a significant influence on maaoscopic properties. If the homopolymers of the two monomers in a copolymer have different Tg values, the Tg value of a statistical copolymer will fie in between the two homopolymer values. More or less, the same holds tme for other properties, such as hardness and elasticity modulus. All of this is tme if the copolymer has a narrow CCD. If the CCD is broader or even bimodal, phase separation may occur. This will lead to a much more complex situation, where the properties are a function not just of the overall chemical composition, but also of the phase morphology as was indicated in Section 6.12.3.1. An additional complication can be introduced if the copolymer chains contain a gradient as explained in Section 6.12.7. 

Figure 8.4 Class transition temperature fTgj (a) and 5% weight-loss temperature (Ta) (b) of 6FDA-TAPOB HBIP-silica hybrid membranes plotted against silica content...

Class transition temperature constructed so that area... 

Tab. 1.3 class transition temperature of anhydrous sugars and carbohydrate polymers (adapted from Bhandari and Howes (1999)). 

Class transition temperature manufacturers information and values courtesy Perkin Elmer (UK) Ltd, measured by differential scanning calorimetry at W°C/min. Stability to yellowing with light exposure (Down, 1986, 2001). 

Liquid crystalline siloxanes are limited with respect to the glass transition in comparison to other backbone systems, such as poly(meth)acrylates. Class transition temperatures of up to 80 °C can be achieved, but there is a limit for the variations of the mesogenic groups l Therefore, cross-linking is the preferred method. The presence of at least some polymerizable moieties within the side chain groups is necessary. Typical examples for these groups are epoxides, cinnamates, or methacrylates. 

Table 7.4 Class transition temperatures for the PS/PVME blend system...

Figure 5.3 Class transition temperature versus blend composition (weight fraction of the electron-donor substituted component) for a blend oftwo substituted poly(vinyl cinnamate) polymers (a) with OCH3 and Cl groups in the...

VI/214 CLASS TRANSITION TEMPERATURES OF POLYMERS TABLE 1. cont d... 

VI/218 CLASS TRANSITION TEMPERATURES OF POLYMERS TABU 2. MAIN-CHAIN CARBOCYCLIC POLYMERS... 

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