Characterization of thermoplastic polyimide NEW-TPI reg sign

Journal Article · Tue Jan 01 00:00:00 EST 1991 · SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States)

OSTI ID:6021703

Hou, T H ^[1]; Reddy, R M ^[2]

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1. Lockheed Engineering and Sciences Co., Hampton, VA (United States)
2. Old Dominion Univ., Norfolk, VA (United States)

Thermal and rheological properties of a commercial thermoplastic polyimide, NEW-TPI{reg sign}, were characterized. The as-received material possesses initially a transient crystallite form with a bimodal distribution in peak melting temperatures. After the meltings of the initial crystallite structures, the sample can be recrystallized by various thermal treatments. A bi-modal or single modal melting peak distribution is formed for annealing temperatures below or above 360C respectively. The recrystallized crystallinities are all transient in nature. The polymers are unable to be recrystallized after being subjected to elevated temperature annealing above 450C. The recrystallization mechanism was postulated, and a simple kinetics model was found to describe the behavior rather satisfactorily under the conditions of prolonged thermal annealing.

• OSTI ID: 6021703
• Journal Information: SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States), Vol. 22:2; ISSN 0036-0821
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
THERMOPLASTICS
RECRYSTALLIZATION
RHEOLOGY
THERMODYNAMIC PROPERTIES
ANNEALING
CALORIMETRY
CRYSTAL STRUCTURE
ELASTICITY
EXPERIMENTAL DATA
IMIDES
KINETICS
MATHEMATICAL MODELS
MELTING POINTS
POLYMERS
VISCOSITY
X-RAY DIFFRACTION
COHERENT SCATTERING
DATA
DIFFRACTION
HEAT TREATMENTS
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
SCATTERING
SYNTHETIC MATERIALS
TENSILE PROPERTIES
TRANSITION TEMPERATURE
360606* - Other Materials- Physical Properties- (1992-)
360602 - Other Materials- Structure & Phase Studies