Abstract
AbstractThe mechanical properties and fracture toughness of thin films of a series of poly(n‐pentyl‐n‐alkylsilanes) were investigated. Poly(n‐butyl‐n‐pentylsilane) is the strongest of these polymers with an elastic modulus of 2.96 × 108 Pa and a fracture strain of 85% at 25°C. The hexagonal mesophases of these polymers generally show elastic moduli on the order of 107 Pa and are often quite extensible. A J‐integral analysis of the ductile tearing of thin films of poly(n‐butyl‐n‐pentylsilane) and poly(n‐propyl‐n‐pentylsilane) using an Instron tensile testing machine and specimens in the single edge notch (SEN) geometry yielded plane stress J1c (critical value of J for fracture initiation) of 1745 J/m2 and 205 J/m2, respectively. Both values are significantly higher than the plane stress G1c (critical energy release rate) value of 109 J/m2 obtained for poly(di‐n‐hexylsilane) with a residual stress analysis using the same apparatus and testing procedure.
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