脲醛树脂包覆双环戊二烯微胶囊的力学性能  

Mechanical properties of microcapsules encapsulating DCPD with MF

作　　者：胡剑峰[1] 夏正斌[1] 司徒粤[1] 陈焕钦[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《化工学报》2010年第10期2738-2742,共5页CIESC Journal

摘　　要：包封活性物质的微胶囊与催化剂一起分散在树脂中能够制备出具有自修复功能的材料。自修复材料在外力作用下,内部出现裂缝时,具有自动修复并维持力学性能的功能。扩大自修复材料的应用,离不开对这种自修复用微胶囊力学性能优化的研究。在本研究中,使用三聚氰胺-甲醛树脂(MF)为壳材料,双环戊二烯(DCPD)为芯材料,采用原位乳液聚合法制备自修复用微胶囊。借助微操系统(micromanipulation),在探针移动速率为2μm.s-1,环境温度为(23±0.50)℃的条件下,对两种反应条件下得到的微胶囊用探针对单个微胶囊进行挤压-停留、挤压-释放和挤压至破裂等操作。结果表明,微胶囊在比较小的形变下(≤17.7%),体现的是弹性体的行为,在较大形变下(≥19.5%),体现的是黏弹性体的行为。Microcapsules containing a self-healing agent may be incorporated into functional materials to maintain their mechanical strength after a crack is generated.Such microcapsules should have optimum mechanical strength.In this work,microcapsules were formulated by encapsulating dicyclopentadiene （DCPD）with a shell of melamine formaldehyde （MF）in in-situ polymerization.The mechanical properties of the microcapsules prepared under two different conditions were investigated with micromanipulation by compressing and holding,compressing and releasing,and compressing to rupture at 2 μm·s-1 probe moving speed and （23±0.50）℃.The results showed that the microcapsule showed plastic behavior under small deformation （≤17.7%） while visco-plastic behavior under big deformation （≥19.5%）.

关 键 词：微胶囊 自修复 微操系统 

分 类 号：TQ32[化学工程—合成树脂塑料工业]