Research on long-chain alkanol etherified melamine-formaldehyde resin MicroPCMs for energy storage

摘要

Aiming at the characteristics of melamine-formadehyde resin with poor toughness and high brittleness owing to its unique structure of trizine ring,long-chain alkanol etherified melamine-formaldehyde prepolymer was selected as shell material to synthesize MicroPCMs.The study mainly explored the effect of etherification and relevant influencing factors in the etherification process on performance of microcapsules.Through a series of characterization,the alkyl chain of dodecanol can be grafted into the methylolated melamine-formaldehyde prepolymer via etherification,contributing to enhancing the adsorption of core material and encapsulation effect of microcapsules.The optimal molar ratio of melamine,formaldehyde and n-dodecanol was 1∶7∶2 in etherification process.N-dodecanol-etherified melamine-formaldehyde prepolymer was synthesized via one-step method as shell material for encapsulation n-dodecanol to obtain MicroPCMs4-2.The MicroPCMs4-2 finally obtained presented complete microstructure,uniform particle size distribution,well dispersibility and satisfactory thermal energy storage performance with high enthalpy value (ΔH_m = 166.1 J/g,ΔH_c=160.2 J/g) and effective loading (72.2%) for potential applications to thermal-regulating textiles and energy storage fibers.