Dynamic mechanical properties of N-phenylnadimide modified PMR polyimide composites

Temperature-frequency dependence of alpha, beta, and gamma transitions was determined using a Rheometrics dynamic spectrometer on a series of unidirectional Celion 6000/N-phenylnadimide (PN) modified PMR polyimide composites. The objective was to see if any correlations exist between crosslinked net...

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Bibliographic Details
Published in:Polymer composites 1991-04, Vol.12 (2), p.133-136
Main Author: Pater, Ruth H.
Format: Article
Language:English
Subjects:
360603 - Materials- Properties
ACTIVATION ENERGY
Applied sciences
CHEMICAL REACTIONS
COMPOSITE MATERIALS
Composites
COPOLYMERS
CROSS-LINKING
ENERGY
Exact sciences and technology
Forms of application and semi-finished materials
IMIDES
MATERIALS
MATERIALS SCIENCE
MECHANICAL PROPERTIES
MONOMERS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
Polymer industry, paints, wood
POLYMERIZATION
POLYMERS
RESINS
Technology of polymers
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
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Summary:Temperature-frequency dependence of alpha, beta, and gamma transitions was determined using a Rheometrics dynamic spectrometer on a series of unidirectional Celion 6000/N-phenylnadimide (PN) modified PMR polyimide composites. The objective was to see if any correlations exist between crosslinked network structure and dynamic mechanical properties. Variation in crosslinked network structures was achieved by altering the polyimide formulation through addition of various quantities of PN into the standard PMR-15 composition. As a control, PMR-15 composite system exhibited well-defined alpha, beta, and gamma transitions in the regions of 360, 100, and -120 C, respectively. Their activation energies were estimated to be 232, 60, and 14 kcal/mole, respectively. Increasing the amount of PN concentration caused lowering of the activation energies of the three relaxations, a decrease of the glass transition temperature, and increasing intensities of the three damping peaks, compared to the control PMR-15 counterpart. These dynamic mechanical responses were in agreement with formation of a more flexible copolymer from PN and PMR-15 prepolymer.
ISSN:0272-8397
1548-0569
DOI:10.1002/pc.750120211