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  • 1
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    Spiral Fracture Characteristics in some Reinforced Polymers (1966)
    Springer Nature
    Details
    Publication Date: 1966-10-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 2
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    Thermal Isomerization of Poly(triallyl cyanurate) using a Dynamic Mechanical Method (1962)
    Springer Nature
    Details
    Publication Date: 1962-09-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 3
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    Advances in instrumentation and technique of torsional pendulum and torsional braid analyses (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Instrumentation and techniques of torsional pendulum and braid analyses, studying trace moisture and cure cycle effects on thermomechanical spectra of polymeric materials
    Keywords: MATERIALS, NONMETALLIC
    Type: ; 121- 147. (
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Advance development of a technique for characterizing the thermomechanical properties of thermally stable polymers (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The torsional braid experiment has been interfaced with a centralized hierarchical computing system for data acquisition and data processing. Such a system, when matched by the appropriate upgrading of the monitoring techniques, provides high resolution thermomechanical spectra of rigidity and damping, and their derivatives with respect to temperature.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-138123
    Format: application/pdf
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  • 5
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    Investigation of structure-property relationships in systematic series of novel polymers (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Solid state transitions in polymeric materials was associated with the onset of sub-molecular motions of the polymer chains. Although these were considered to be intramolecular in general, the local environment of the polymer molecule exerts a strong influence through, for example, the effects of crystallinity, polarity and diluents. The manner of specimen preparation and previous history also affect transitions. The transitions are considered to arise when sufficient free volume is available to permit the occurrence of these side chain and backbone reorientations. The glass transition is the principal transition of amorphous polymeric materials and is associated with the onset of long range segmental motion of the polymer backbone. The various types of shorter range motion occurring below the glass transition have been catalogued.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-146417
    Format: application/pdf
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  • 6
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    Isothermal transitions of a thermosetting system (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A study of the curing reactions of a cycloaliphatic epoxy resin/anhydride system by torsional braid analysis showed the existence of two critical isothermal temperatures - namely, the maximum glass transition temperature of the thermoset system and the glass transition temperature of the material at its gel point. Two rheologically active kinetic transitions occur during isothermal cure which correspond to gelation and vitrification. Three types of isothermal behavior occur. Methods for determining the time to gel and the time to vitrify, and also the two above-mentioned critical isothermal temperatures, have been developed. The time to gel obeyed the Arrhenius relationship, whereas the time to vitrify passed through a minimum. Application of these results to thermosetting systems in general is discussed in terms of the influence of molecular structure on the values of the critical isothermal temperatures.
    Keywords: CHEMISTRY
    Type: Journal of Applied Polymer Science; 18; 1974
    Format: text
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  • 7
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    Thermomechanical behavior of a polynorbornadiene (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A high-temperature linear amorphous hydrocarbon polymer synthesized cationically from 2,5-norbornadiene was studied thermomechanically with respect to physical transitions and stability in nitrogen. The glass transition temperature was determined to be 320 C (at less than 1 cps), which is probably the highest known for a linear hydrocarbon addition polymer. The thermomechanical technique of torsional braid analysis, together with thermogravimetric analysis, differential thermal analysis, infrared analysis, and solubility studies, was used to investigate the sequential events of the glass transition and degradation. The polymer is of particular interest since it is a high-temperature plastic which in the bulk form would probably need to be processed at high speeds in the vicinity of the glass transition temperature in an inert atmosphere. The presence of tertiary hydrogen atoms should render it amenable to degradation by the earth's environment.
    Keywords: MATERIALS, NONMETALLIC
    Type: Journal of Applied Polymer Science; 17; 1973
    Format: text
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  • 8
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    Thermomechanical behavior of amorphous tactic methacrylate polymers (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Dynamic mechanical spectra of amorphous stereoregular poly(methyl methacrylate)s and poly(t-butyl methacrylate)s with assigned microtacticities are presented and discussed. An intermolecular argument is invoked to account for the higher glass transition temperature of syndiotactic vis a vis isotactic PMMA, in spite of the higher density of the latter at 30 C. An argument is presented to show that the ratio of glassy-region relaxation temperature to glass transition temperature is not only a measure of the degree of coupling of the beta and glass transition processes, but also of the degree to which intermolecular factors influence these processes. The greater extent of the low-temperature irreversibilities observed in the thermomechanical spectra of poly(t-butyl methacrylate)s is attributed to the brittle character induced by the bulky side groups which presumably weaken cohesive forces.
    Keywords: MATERIALS, NONMETALLIC
    Type: Journal of Macromolecular Science; vol. 9
    Format: text
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  • 9
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    Low-temperature relaxations in amorphous polyolefins (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The dynamic mechanical relaxation behavior of two series of amorphous polyolefins, was investigated from 4.2 K to the glass transition. Most of the polymers show a damping maximum or plateau in the 40 to 50 K region. Various mechanisms which have been suggested for cryogenic relaxations in amorphous polymers are considered as they might relate to the polyolefins. Two secondary relaxation processes above 80 K are distinguished. A relaxation at about 160 K (beta) in the second and third member of each series is associated with restricted blackbone motion. This process requires a certain degree of chain flexibility since it is not observed in the first member of each series. A lower temperature process (gamma) is observed in each member of the second series and is attributed to motion of the ethyl side group.
    Keywords: MATERIALS, NONMETALLIC
    Type: Journal of Macromolecular Science; vol. 9
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  • 10
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    Thermomechanical and thermogravimetric analyses of systematic series of polyimides. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Abstract missing.
    Keywords: CHEMISTRY
    Type: Shaping the future with plastics; Thirtieth Annual Technical Conference; May 15, 1972 - May 18, 1972; Chicago, IL
    Format: text
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