Thermal performance and crystallization behavior of poly(ethylene glycol) hexadecyl ether in confined environment

Abstract

A series of poly(ethylene glycol) hexadecyl ether (Brij58)/porous active carbon (AC) composites were fabricated via a physical method, and their crystallization behavior was characterized in detail using thermogravimetric analysis, X-ray diffraction (XRD) and differential scanning calorimetry. The Brij58/AC composites exhibit a good structural-stabilized property, and the decomposition temperature is higher than that of pure components. Obvious crystalline structure and thermal behavior are found when the amount of Brij58 loaded is above 25 wt%. A new peak at 18.9 • in XRD patterns proves that the porous AC influences the crystallization and nucleation process of Brij58. From non-isothermal crystallization kinetics, the increased half-time t 1/2 and F(T) demonstrate the confined crystallization behavior of Brij58 in AC matrix because of the facile entrapment of hydrophilic poly(ethylene glycol) segments by AC nanopores. Further explanations also arise from the viewpoint of molecular mobility under nanoscale conditions.

Synthesis and thermal properties of cross-linked poly(acrylonitrile-co-itaconate)/polyethylene glycol as novel form-stable change material

“…As can be seen from DSC curves and data, the maximum melting and freezing peak of PEG in the composites shift toward lower temperatures compared with PEG, this is mainly because the PEG molecules in cross-linked P(AN-co-IA) networks exhibit a confined crystallization process in light of the changes of crystallization environments. Additionally, the decreased T c of the CFSPCMs composites also confirms that the P(AN-co-IA) template does not play the role of nucleation agent for the crystallization of PEG [30]. Moreover, as can be seen from Table 2, there are considerable differences between the phase transition temperatures of the CFSPCMs obtained from heating and cooling processes.…”

Investigation of PEG/mixed metal oxides as a new form-stable phase change material for thermoregulation and improved UV ageing resistance of bitumen

“…11 PEG-based form-stable PCMs which are oen composed of PEG and supporting materials have been developed to overcome the shortcomings. These PEG-based form-stable PCMs such as PEG/ silica, [17][18][19][20] PEG/diatomite, 21,22 PEG/gypsum, 23 PEG/montmorillonite, 24,25 PEG/porous carbons, [26][27][28] and PEG/polymers, [29][30][31][32] can keep the solid state even when PEG is undergoing solid-liquid phase transition above the melting temperatures. Additionally, Zhu et al 33 prepared a PEG/surface-modied layered double hydroxides (LDHs) form-stable PCM using the surface-modied LDHs as supporting material to prevent leakage of liquid PEG.…”

Preparation of Quasi‐Thermoplastic Phase Change Polymer with Intrinsic Antileakage Performance for Battery Thermal Management

“…This phenomenon could be ascribed to the different stacking patterns of alkyl groups (orthorhombic or hexagonal phase) [ 37 ] and the higher mobility of the alkyl chains within the linear molecular structure than the rigid crosslinking backbone. [ 38 ] Without doubt, the much higher T c will play an important role in secondarily dissipating the absorbed heat toward the environment, avoiding excessive heat accumulation in the module, and thus ensuring a stable temperature control performance, especially under high ambient temperatures.…”