Preparation and thermal conductivity reinforcement of PMMA/PEG600/CNT composite shaped phase change materials
Aiming at the problem of low thermal conductivity of solid-liquid phase change composites due to the uneven distribution of carbon materials,the dispersion of CNT in the system was optimized by in situ polymerization and combined with functionalized surface modification,and the thermally enhanced composite phase change material of polymers of methyl methacrylate(PMMA)/polyethylene glycol(PEG600)/carbon nanotubes(CNT)was proposed.First,the optimal mass ratio of PMMA as the base for encapsulating the phase change material PEG600 was determined to be 3∶7,when the material combines good encapsulation and thermal storage properties.Secondly,using the in situ polymerization method,which is good for regulating the viscosity of the system,CNT was introduced into the PMMA/PEG600 system to the maximum extent up to the concentration threshold,which greatly enhanced the thermal conductivity of the composite material.When the mass fraction of CNT was 7％,the thermal conductivity of the composite was 0.438 W/(m·K),which was about three times of that without CNT.Finally,hydroxyl-functionalized surface modification for CNT further enhanced the thermal conductivity.When the mass fraction of hydroxylated CNT was 3％,the thermal conductivities of ternary composites containing CNT and hydroxylated CNT were enhanced by 8％and 92％,respectively,compared with those of binary composites.
国家科技期刊平台
NSTL
万方数据
