Influence of time and temperature on polymers

Influence of the Cooling Rate on the Thermal Behavior of PET

The higher the cooling rate, the less time the polymer chains have to crystallize, and the higher the amorphous phase.

Glass Transition Temperature (Tg) of Polymers for Plastic Injection ...

During plastic injection molding, Tg affects processing conditions, cooling times, and post-molded properties such as a part's thermal, ...

Effect of water absorption in polymers at low and high temperatures

Water absorption depends on temperature, time, thick- ness of specimen, and the amorphous content in a polymer. The latter is not well known for semi ...

Time‐ and Temperature‐Dependent Fracture Mechanics of Polymers

The temperature dependence of the toughness GId is characterised by two maxima, of which the one at lower temperature (T = 100 °C) is correlated ...

The Temperature Dependence of Relaxation Mechanisms in ...

time at temperature T to its value at a reference temperature To ... cal relaxation times which characterizes polymers seems to be absent entirel ...

The Effect of Aging on the Glass Transition Temperature of ... - DTIC

With increased aging time/temperature, crosslinking occurs, which raises the Tg's of the methyl containing and methyl-free polymer species. Schoff and ...

Glass Transition Temperature of Polymers - Goalpara College

Fig 1: Relation of polymer state and temperature. Effect of temperature on polymer. The hard and brittle state is the glassy state and soft-flexible state is ...

The effect of the heat used during composite processing on ... - Nature

At a given temperature, increasing treatment time decreased the tensile modulus. At 180 °C (above the melting temperature of the unconstrained ...

Glass Transition - Polymer Science Learning Center

When the polymer is cooled below this temperature, it becomes hard and brittle, like glass. Some polymers are used above their glass transition temperatures, ...

Temperature Dependence of Plastics: The Glass Transition

The physical properties and performance of polymeric materials, such as strength, stiffness, and impact resistance, are highly dependent on the temperature at ...

Effect of Melt Temperature and Holding Time on Mechanical ...

In [16] conveyed that the time and temperature in the process of the making polymer composite affect the mechanical properties. The same thing was expressed ...

Crystallization and recrystallization of polymers - Linseis

The prerequisite for crystallization is to maintain the optimum temperature and the time required for crystal growth. Recrystallization can be supported and ...

Polymer viscoelasticity and the relaxation modulus - YouTube

I also introduce the glass-transition temperature and the melting temperature ... Influence of time and temperature on polymers. Scott Ramsay•17K ...

Effect of curing temperature conditions on glass transition ... - HAL

DSC and. TMA allow the evaluation of the time-temperature dependence of the epoxy polymer.Structural reinforcement by thermosetting polymer ...

Thermally induced shape-memory effect (polymers) - Wikipedia

Metals exhibit a bidirectional shape-memory effect, maintaining one shape at each temperature. · Polymers can change their shape with elongations up to 200% ...

Temperature effects on material properties and structural response ...

measured temperature-time (T-t) curve under this heating rate. ... . The influence of thermal lag on the glass transition temperature of polymers measured under ...

Investigating the influence of temperature on electrospinning of ...

However, tanδ grows at temperatures above 50°C for a polymer concentration of 20 wt.%. It means that an increase in polymer concentration ...

Polymer | Park Systems

Temperature changes can have a significant impact on the mechanical properties of polymers [2]. As the temperature increases, the polymer's Young's modulus ...

On time-temperature-concentration superposition principle for ...

The time-concentration superposition (TCS) principle is also validated in CB filled ethylene-tetrafluoroethylene (ETFE) alternating copolymer at ...

On the Time and Temperature Dependent Behaviour of Laminated ...

The thesis investigates a polymeric laminate consisting of poly(methyl methacrylate) (PMMA) and thermoplastic polyurethane (TPU) experimentally and ...