How is ptmeg produced?
PTMEG is produced by the catalyzed polymerization of tetrahydrofuran (THF). The chief uses of PTMEG are in the production of spandex (polyurethane) fibers, polyurethane elastomers, and copolyester-ether elastomers. This elastomeric fiber is used mainly in apparel, including undergarments, hosiery, and athletic outfits.
How do you calculate glass transition temperature?
There are a variety of thermal and mechanical analytical techniques that can be used to measure the glass transition temperature (Tg). Most notably these include: Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and Thermomechanical Analysis (TMA) depending on the sample.
What factors affect glass transition temperature?
Factors Affecting Tg
- Molecular Weight – In straight chain polymers, increase in MW leads to decrease in chain end concentration resulting in decreases free volume at end group region – and increase in Tg.
- Molecular Structure – Insertion of bulky, inflexible side group increases Tg of material due to decrease in mobility,
What is the glass transition temperature of PLA?
between 50 and 80 °C
PLA has a glass transition temperature between 50 and 80 °C and a melting temperature between 170 and 180 °C depending on the amount of residual monomer. It is expected to have wide applications because of its excellent mechanical and biodegradable properties, as well as its adjustable hydrolyzability.
What is glass transition temperature of polymers?
The glass transition temperature is the temperature range where the polymer substrate changes from a rigid glassy material to a soft (not melted) material, and is usually measured in terms of the stiffness, or modulus.
What is glass transition temperature of inorganic polymers?
Polymers. Dry nylon-6 has a glass transition temperature of 47 °C (117 °F). Nylon-6,6 in the dry state has a glass transition temperature of about 70 °C (158 °F).
What is glass transition temperature in polymers?
Which polymers have high glass transition temperature?
These types of interactions increase the rigidity of polymeric material therefore increase the glass transition temperature. Polyvinyl chloride has higher Tg than polyethylene and Nylon-6 also has higher transition point than polyolefin.
What is the molecular weight of glass transition temperature?
Glass Transition Temperature Tg K 185 – 194 189 Molar Heat Capacity Cp J (mol K)-1 143 – 151 148 Entanglement Molecular Weight Me g mol-1
What is the molecular weight of PolyTHF?
Common PolyTHF molecular weight from 1000 to 2000, at room temperature and solid cereus, 35 ° C for colorless liquid viscosity. Glass transition temperature 76 ° C and relative density of 0.981 to 0.985, the most soluble in organic solvents, do not dissolve in water. Tetrahydrofuran is.
What is PolyTHF used for?
PolyTHF is mainly used for the block or the block polyether polyurethane soft polyester chain. From the molecular weight of 1000 PolyTHF system of block polyurethane rubber for tires, belts, gaskets, synthetic leather, such as films and coatings. Compared to block polyether polyester thermoplastic elastomer.