: The ultimate crystalline modulus of poly(oxymethylene) was estimated by using the Raman longitudinal acoustic mode and small-angle X-ray scattering. In this paper we emphasize the sensitivity of the calculated modulus to the values chosen for the thickness of the crystalline regions. Assuming that the uniform elastic rod model provides an adequate description of the LAM, we found Ec= 146 GPa, in excellent agreement with the results of neutron-scattering experiments. We have also explored the melting behavior of the solution-crystallized materials used in this study. The estimated value of the fold surface free energy (=88 ergs/cm2) indicates a work of chain folding near 4 kcal/mol folds, a value in line with that found for other polyethers.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry