Polyoxymethylene physical properties

These crystal modifications differ in their molecular and crystal structures as well as in their physical properties. Many types of crystalline modifications are reported, including a stable orthorhombic phase and metastable monoclinic phase for PE a, and y forms for isotactic polypropylene (/-PP) trigonal and orthorhombic phases for polyoxymethylene a and y forms for Nylon 6 and others. Poly(vinylidene fluoride) (PVF), for example, appears in at least four types of crystalline modification (Lovinger, 1985 Dunn Carr, 1989). 

A series of papers by Du Pont authors on thermally stable high molecular weight polyoxymethylenes, molecular structure, fine structure, physical properties and on solvents indicate that these resins, which may... 

An accurate evaluation of the energetics of different conformations in pol3nners is of basic importance for an understanding of their physical properties. We therefore investigated also other periodic conformations of polyethylene and polyoxymethylene including extensive geometry optimization. Results on the energies of (t), (g), and (tg) helices are collected in table 6,... 

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