Overview

Thermoset polyimides have great potential for successfully meeting tough stress and temperature challenges in the advanced aircraft development program. However, studies of structure-property relationships in these materials have not been very successful so far. Positron lifetime spectroscopy (PLS) has been used to investigate free volumes and associated parameters in a series of variable, segmental molecular weight samples. The free volume correlates well with the molecular weight M(sub c), the cross-link density v, and the coefficient of thermal expansion (CTE) of these materials. Currently, no other techniques are available for direct measurement of these parameters, particularly for polymers in solid phase. Experimental results and their interpretations are presented. Ranganathaiah, C. and Sprinkle, D. R. and Pater, R. H. and Eftekhari, A. Langley Research Center NASA-TM-4707, L-17515, NAS 1.15:4707 RTOP 505-63-50-01...

Full Product Details

9781725000650

Table of Contents

Reviews

Author Information

Tab Content 6

Countries Available