Abstract 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 enhance 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 synthesized via one-step method as shell material encapsulated 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 (△Hm = 166.1 J/g, △Hc = 160.2 J/g) and effective loading (72.2%) for potential applications to thermal-regulating textiles and energy storage fibers.

中文翻译：

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用于储能的长链烷醇醚化三聚氰胺-甲醛树脂MicroPCMs的研究

摘要 针对三聚氰胺甲醛树脂因具有独特的三嗪环结构而韧性差、脆性大的特点，选择长链烷醇醚化三聚氰胺-甲醛预聚体作为壳材料合成MicroPCMs。研究主要探讨了醚化作用及醚化过程中相关影响因素对微胶囊性能的影响。通过一系列表征，十二烷醇的烷基链可以通过醚化接枝到羟甲基化三聚氰胺-甲醛预聚物中，有助于增强芯材的吸附和微胶囊的包封效果。醚化过程中三聚氰胺、甲醛和正十二醇的最佳摩尔比为1:7:2。通过一步法合成的正十二醇醚化三聚氰胺-甲醛预聚物作为壳材料包封正十二醇获得MicroPCMs4-2。最终得到的MicroPCMs4-2具有较高的焓值（△Hm = 166.1 J/g，△Hc = 160.2 J/g）和有效载荷（72.2%），具有完整的微观结构、均匀的粒度分布、良好的分散性和令人满意的热储能性能) 用于热调节纺织品和储能纤维的潜在应用。