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glass-transition temperature

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780115
EISBN: 978-1-62708-281-5
... Urethane elastomer … … 90 190 0.07–0.30 0.04–0.178 100–200 Urethane rigid foam … … 160 325 0.06–0.12 0.033–0.067 80 (a) Short-term continuous service temperature. (b) Long-term continuous service temperature Glass-transition and melting temperatures of selected...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730099
EISBN: 978-1-62708-283-9
... is highly branched. The bonds between neighboring molecular chains are weak van der Waals bonds. Therefore, most polymers do not readily crystallize. Instead, on cooling they form an amorphous glass at a glass transition temperature. The relative positions of molecules are frozen so the amorphous glass...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780314
EISBN: 978-1-62708-281-5
...Abstract Abstract This article describes the mechanisms of moisture-induced damage in polymeric materials, covering the characteristics of important structural plastics; the effects of moisture on glass transition temperature, modulus, creep, and stress relaxation of plastic materials...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540297
EISBN: 978-1-62708-309-6
... than melt by heat as thermoplastics do. They are used at temperatures below the glass transition temperature. Thermoplastics have a linear structure (i.e., not cross-linked). They usually contain various stabilizers, fillers, or toughening agents; therefore, a wide range of properties are possible. Due...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610327
EISBN: 978-1-62708-303-4
... for a typical polymer tested at four temperatures while the strain rate is kept constant. 1, low temperature, brittle behavior; 2, intermediate temperature, somewhat ductile; 3, higher temperature (approaching glass transition), necking and cold drawing; 4, above glass transition temperature, homogeneous...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870063
EISBN: 978-1-62708-314-0
... 3.10.4 Glass Transition Temperature 3.9.1 Thermoplastic Composite Matrices 3.9.2 Thermoplastic Composite Product Forms Composites are unlike metals in that their final properties are dependent upon chemical reactions. Since the fabricator cures the part, methods must be used to control...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780204
EISBN: 978-1-62708-281-5
... the material prevents flow, which in turn obviates region 4. Fig. 1 Log relaxation modulus, E ( t ), as a function of log time, t (or temperature), for a glassy thermoplastic material. 1, glassy plateau; 2, transition region; 3, rubbery plateau; 4, flow region. T g , glass transition temperature...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780343
EISBN: 978-1-62708-281-5
... in dilute dispersions, molecular aggregation Differential thermal analysis (DTA) Glass transition temperatures, T g ; melt/crystallization temperatures, T m Phase changes, T g and T m Differential scanning calorimetry (DSC) Heat of polymerization, fusion, T g , T m Phase changes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870401
EISBN: 978-1-62708-314-0
... Potential moisture effects Fig. 15.2 Effect of moisture on glass transition temperature Fig. 15.4 Effects of moisture on tension and compression strength of carbon/epoxy. Source: Ref 2 Fig. 15.5 Effects of moisture on matrix-dominated properties of carbon/epoxy. Source: Ref...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030237
EISBN: 978-1-62708-349-2
... The proper selection of the matrix material for the environment in which a component is to be used is critical so that long-term durability of the part is maintained. If the temperature to which the composite is exposed in service exceeds the glass transition temperature of the matrix, the material can creep...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550325
EISBN: 978-1-62708-307-2
.... Addition-curing thermosets, such as epoxies, polyesters, vinyl esters, and bismaleimides, are generally much easier to process with low void levels. An important consideration in selecting any plastic (thermoset or thermoplastic) is the glass transition temperature. The glass transition temperature ( T...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730081
EISBN: 978-1-62708-283-9
.... Figure 8.4 is a plot of the viscosities of several glass compositions as a function of temperature. Above the glass transition temperatures, there is a strong temperature dependence of the viscosity. Fig. 8.4 Temperature dependence of viscosity for several glasses. The “working range...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780267
EISBN: 978-1-62708-281-5
... for a phenolic resin/aramid fiber composite ( Ref 29 ) showing partial coverage of the polymer pin by transfer film Traditionally, glassy thermoplastics have not been used as typical tribological materials. This is because they show mechanical instability at the glass transition temperature. However...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870001
EISBN: 978-1-62708-314-0
... temperature on the matrix-dominated properties. Design parameters for carbon/epoxy are cold-dry tension and hot-wet compression ( Fig. 1.22 ). An important design factor in the selection of a matrix resin for elevated-temperature applications is the cured glass transition temperature. The cured glass...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290035
EISBN: 978-1-62708-319-5
... with the melting temperature, T M , as shown in Fig. 3.4 . However, if the polymer is cooled rapidly, then crystallization is suppressed. On reaching the glass transition temperature, T g , the amorphous structure is frozen into the solid polymer, as seen in Fig. 3.4 . These two temperatures are designated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230145
EISBN: 978-1-62708-298-3
... not result in a large free volume, and after annealing above the glass transition temperature, the density increased by only approximately 0.1%. Information on the composition ranges that can be slowly cooled (10 K/s, or 18 °F/s, or less) and still remain amorphous was given in a later publication...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
... Fig. 1 Change in behavior of a polymeric material with increasing strain rate and/or decreasing temperature. (a) Brittle behavior. (b) Limited ductility behavior. (c) Cold drawing behavior. (d) Rubbery behavior. Curve (a) could represent testing below the glass transition temperature. Source...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870489
EISBN: 978-1-62708-314-0
... Glass transition temperature ( T g )(°F) (a) 160 160–325 with post cure 200–350 with post cure 160–250+ with post cure 300–425 with post cure 350–450 with post cure Fire, smoke, and toxicity … Requires additives Reqs. adds. Excellent Good Good (a) Actual Tg varies with each...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780003
EISBN: 978-1-62708-281-5
... are standard symbols in ASTM D 4000. (b) Common names or common short version of full name are in parenthesis. Sources: Ref 9 , 10 Glass-transition temperatures (<italic>T</italic><sub>g</sub>), and melting temperatures (<italic>T</italic><sub>m</sub>) of representative thermoplastic polymers...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780359
EISBN: 978-1-62708-281-5
..., contamination, degradation, chemical contact Differential scanning calorimetry (DSC) Heat of fusion, melting point, glass transition temperature, heat capacity Material identification, level of crystallinity, aging/degradation, thermal history Thermogravimetric analysis (TGA) Weight loss over...