The low‐temperature thermal conductivity of a polyoxymethylene ’’crystal’’

摘要: The thermal conductivity κ of a polyoxymethylene (POM) ’’crystal’’ has been measured both parallel and perpendicular to the direction fibers between 1.5 100 K. In fiber κ∥ is very much less than might be expected from single crystal but instead similar throughout temperature range extruded POM. Perpendicular κ⊥ rather in material, particularly at lowest temperatures where, even for polymers, unusually small. These observations lead deductions about specimen morphology that are substantiated by experiments involving x‐ray diffraction.