Glass transition of poly(oxymethylene)

Abstract

Heat capacity data of semicrystalline poly(oxymethylene) samples. Delrin and Celcon, are analysed in order to discuss the glass transition behaviour of this polymer. There are two types of non‐crystalline poly(oxymetheylene). the mobile and rigid amorphous parts. The glass transition of the former occurs in a rather wider range of temperature: it starts at 180 K and could end at 265 K. The latter, under restraint due to the crystallites, remains frozen up to the melting temperature.

Sorption of Hydrophobic Organic Compounds to Plastics in the Marine Environment: Equilibrium

“…In contrast, chemicals are said to partition into characteristic nano-sized pores within glassy polymers, and this type of sorption is rather an adsorption-like or pore-filling process [29,30]. As a result, the sorption of organic chemicals to glassy polymers shows nonlinear isotherms, competition Suzuki et al [28] with other coexisting chemicals, and hysteresis due to deformation of the pores [30][31][32].…”

Dielectric spectroscopy and calorimetry in the glass transition region of semi-crystalline poly(ethylene terephthalate)

“…Therefore, it is first necessary to determine the dimensions of the regions which participate in the glass transition. As introduced by Ishida [10] for dielectric and Wunderlich [11] for calorimetric investigations, the fraction participating in the glass transition can be determined by the intensity of the relaxation process under investigation (Ae, Acp; etc.) [4,12].…”

Precision heat capacity measurements for the characterization of two-phase polymers

“…A series of rather narrow backbone macromolecules such as polyethylene [16], polyoxymethylene [17], and polytetrafluoroethylene [18] seem to all show a rather broad glass transition with temperature ranges of 100 K or more which contrasts the normal 5 to 15 K range.…”