When an amorphous polymer is heated, the temperature at which the polymer structure turns “viscous liquid or rubbery is called the glass transition temperature, tg it is also defined as a temperature at which amorphous polymer takes on characteristic glassy-state properties like brittleness, stiffness and rigidity (upon cooling. Read the specifications for any mallard creek polymer product and you'll see a number for its glass transition temperature written as “tg,” this helps users anticipate how the latex polymer will behave at it's service temperature.
Thermal transitions of homopolymers: glass transition & melting point literature values for the glass transition temperature, (t g), and melting temperature, (tm), are given in table i for the more common homopolymers polymers are listed by the repeat-ing unit in the polymer chain these polymers and corre-sponding monomers are available from aldrich. Glass transition (in polymer science): process in which a polymer melt changes on cooling to a polymer glass or a polymer glass changes on heating to a polymer melt  note 1: phenomena occurring at the glass transition of polymers are still subject to ongoing scientific investigation and debate.
Glass transition in polymers is not a first order transition and is observed in the amorphous region of a polymer only in this region, the long polymer chains are oriented randomly and have more. Glass transition temperature 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. Glass transition (in polymer science): process in which a polymer melt changes on cooling to a polymer glass or a polymer glass changes on heating to a polymer melt note 1: phenomena occurring at the glass transition of polymers are still subject to ongoing scientific investigation and debate. The glass transition is a transition which happens to amorphous polymers that is, polymers whose chains are not arranged in ordered crystals, but are just strewn around in any old fashion, even though they are in the solid state.
Glass transition temperature when an amorphous polymer is heated, the temperature at which it changes from a glass to the rubbery form is called the glass transition temperature, t g a given polymer sample does not have a unique value of t g because the glass phase is not at equilibrium. Glass transition in polymers is not a first order transition and is observed in the amorphous region of a polymer only in this region, the long polymer chains are oriented randomly and have more freedom to move the glass transition temperature is highly related to segmental chain motion, as polymers warm up.
This transition point is called the glass transition temperature the tg is accompanied by a change in the heat capacity of the material the polymer does not melt (unlike a crystalline polymer which will melt when heat is applied) but it does undergo a change in structure (from rigid to flexible) that produces a change in the heat capacity of the material. This transition is something that only happens to polymers, and is one of the things that make polymers unique the glass transition is pretty much what it sounds like there is a certain temperature(different for each polymer) called the glass transition temperature, or tg for short when the polymer is cooled below this temperature, it becomes hard and brittle, like glass.
What makes one polymer glass transition at 100 o c and another at 500 o c the very simple answer is this: how easily the chains move a polymer chain that can move around fairly easily will have a very low t g, while one that doesn't move so well will have a high one. What information does the tg (glass transition temperature) tell about a polymer system the tg of a resin system defines when a thermoset polymer goes from an amorphous rigid state to a more flexible state tg is an abbreviation for glass transition temperature.
A glass transition temperature (tg) is the temperature at which a polymer turns from a ductile material to a hard, brittle material each polymer with an amorphous structure has its own unique glass transition temperature, which makes a given polymer better suited for some applications over others. Glass transition science polymers are composed of long, randomly entangled, chains of molecules at low temperatures these chains are locked together and unable to move the polymer feels hard and is quite brittle attempt to stretch or bend it and it cracks add energy, in the form of heat, and the molecular chains become more mobile.
Glass transition temperatures of amorphous polymers in kelvin. The glass transition temperature (t g) is one of the most important thermophysical properties of amorphous polymers it is sometimes called the “melting point of amorphous materials” and as unscientific as this sounds, it is an appropiate description for the glass transition.