摘要
以蓖麻油改性二元醇、六亚甲基二异氰酸酯和N-甲基二乙醇胺为主要原料,合成了一种分子链中含有两亲性基团的阳离子型水性聚氨酯(CiPU);采用悬浮聚合法以自制CiPU为壁材、硬脂酸丁酯(Bs)为芯材制备了CiPU/Bs相变微胶囊。采用傅里叶变换红外光谱仪和高效凝胶渗透色谱仪对CiPU的分子结构及相对分子质量进行表征,研究了CiPU/Bs相变微胶囊悬浮液的稳定性。采用激光光散射粒度分析仪、透射电子显微镜、差示扫描量热法和热重分析对CiPU/Bs相变微胶囊粒径、形态结构和热稳定性能进行了表征。结果表明,CiPU/Bs相变微胶囊呈球状均匀分布,具有明显的核壳结构,囊壁约为50nm,具有较好的弹性,粒径在1μm左右,且随芯材用量增加,粒径增加,其相变温度为27.7℃,相变焓为24.8J/g,包裹率达80%,耐热温度达230℃。
A cationic waterborne polyurethane(CiPU)containing an amphiphilic group in the molecular chain was synthesized by using castor oil modified glycol(AC006),hexamethylene diisocyanate(HDI)and N-methyl diethanolamine(MDEA)as main raw materials.CiPU/Bs phase change microcapsules were prepared by suspension polymerization using self-made CiPU as wall material and butyl stearate(Bs)as core material.The chemical structure and molecular weight of CiPU were characterized by FT-IR and GPC,the stability of CiPU/Bs phase change microcapsule suspension was studied.The particle size,morphology and thermal stability of CiPU/Bs were characterized by dynamic light scattering,transmission electron microscopy(TEM),differential scanning calorimetry(DSC)and thermogravimetric(TG)analysis.The results shown that the CiPU/Bs had a spherical uniform distribution and a distinct core-shell structure.The wall of the capsule was about 50 nm.It had good elasticity,the particle size was about1μm.Moreover,the amount of core material was increased,and the particle size was also increased.The phase transition temperature was 27.7℃,the phase transition enthalpy was 24.8 J/g,the encapsulation rate was 80%,and the heat resistant temperature was 230℃.
作者
汤琦
宗成中
Tang Qi Zong;Chengzhong(School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042)
出处
《化工新型材料》
CAS
CSCD
北大核心
2020年第2期219-223,共5页
New Chemical Materials
关键词
阳离子型水性聚氨酯
硬脂酸丁酯
相变微胶囊
相变温度
相变焓
cationic waterborne polyurethane
butyl stearate
phase change microcapsule
phase transition temperature
phase transition enthalpy
