Structure and properties of a semifluorinated diblock copolymer modified epoxy blend
Structure and properties of a semifluorinated diblock copolymer modified epoxy blend
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DOI：
10.1021/ma070585i
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发表时间：
2007-05-29
期刊：
影响因子：
5.5
通讯作者：
Mondragon, Inaki
中科院分区：
文献类型：
--
作者：
Ocando, Connie;Serrano, Elena;Mondragon, Inaki
采用半氟化二嵌段共聚物聚（十六氟癸酯）-聚（己内酯）- PaF-b-PCL对环氧树脂进行改性，制备了新型纳米结构热固性材料。首先对PaF-b-PCL的相行为和线性粘弹性进行了研究。根据偏析规律，没有检测到有序-有序转变，即超过降解温度的有序-无序转变温度。经过不同热处理的嵌段共聚物的原子力显微镜（AFM）图像显示，自组装发生在球形纳米畴中，这与共聚物的组成一致。该嵌段共聚物进一步用于制备与环氧树脂的纳米结构热固性共混物。DSC和DMA分析表明，固化后PaF嵌段与富环氧相微相分离。PaF块在热固性体系中自组装成蠕虫状和球形胶束。该纳米结构共混物具有高疏水性（upsilon = 109°）和低表面能（17 mN/m）的独特表面性能。
Novel nanostructured thermosetting materials have been prepared by modification of an epoxy resin with a semifluorinated diblock copolymer, poly(heptadecafluorodecyl acrylate)-b-poly(caprolactone), PaF-b-PCL. In a first step, the phase behavior and linear viscoelasticity of PaF-b-PCL were investigated. According to the segregation regime, no order-order transitions were detected, being the order-disorder transition temperature beyond the degradation temperature. Atomic force microscopy (AFM) images of the block copolymer after different thermal treatments revealed that self-assembly takes place into spherical nanodomains, which is consistent with the copolymer composition. This block copolymer was further used to prepare a nanostructured thermoset blend with an epoxy resin. DSC and DMA analysis reveals microphase separation of PaF block from the epoxy-rich phase after curing. The PaF block self-assembled into wormlike and spherical micelles in the thermoset system. This nanostructured blend presented unique surface properties showing high hydrophobicity (upsilon = 109 degrees) and low surface energy (17 mN/m).