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enthalpy

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Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006932
EISBN: 978-1-62708-395-9
... gradually approach thermodynamic equilibrium. The approach to equilibrium can lead to drastic or sometimes subtle changes in physical properties. Although aging is often characterized by monitoring changes in excess enthalpy and entropy, these measurements do not necessarily directly correlate with changes...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003551
EISBN: 978-1-62708-180-1
... reaction to occur, using the appropriate thermodynamic calculations. This should be done in two steps: Verify the available thermodynamic data for the thermal stability of each constituent. Make the appropriate thermodynamic calculations to estimate the free enthalpy variations (Δ G ) r , for all...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006931
EISBN: 978-1-62708-395-9
... ) did not relate to the LOI. Polymer thermal and oxidative properties Table 5 Polymer thermal and oxidative properties Polymer T g (softens) T m (melts) T p (pyrolysis) T c (combustion) Δ H (change in enthalpy) Limiting oxygen index °C °F °C °F °C °F °C °F...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006909
EISBN: 978-1-62708-395-9
... transitions (i.e., T g and T m ) for most polymeric materials (see ISO 11357-2 or ASTM D3418). Differential scanning calorimetry measures enthalpy changes in samples due to changes in their physical and chemical properties as a function of temperature or time. The technique needs only a small amount...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006934
EISBN: 978-1-62708-395-9
... y RT ) where ε ̇ 0 is a constant preexponential strain rate, Δ H a is the activation enthalpy, R is the universal gas constant, and v a is the activation volume for shear flow under a shear stress,σ y . Criteria for Shear Yielding Stress-strain curves of polymers...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006924
EISBN: 978-1-62708-395-9
... is a recommended method to measure T g free from potentially interfering nonreversing events such as enthalpy relaxation, residual cure, and evaporation of volatile components. The following is an example of the unique capability of MTDSC in the characterization of thermoset behavior. Figure 18...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006923
EISBN: 978-1-62708-395-9
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.9781627083959
EISBN: 978-1-62708-395-9