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含氟聚甲基丙烯酸酯/聚异丁烯嵌段共聚物的成膜性质研究

DOI: 10.11777/j.issn1000-3304.2014.14140, PP. 1648-1658

Keywords: 聚合物薄膜,聚异丁烯,含氟嵌段共聚物,氧负离子聚合

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Abstract:

利用氧负离子聚合方法制备含氟聚异丁烯三嵌段共聚物,聚异丁烯-b-聚甲基丙烯酸-2-(N,N-二甲氨基)乙酯-b-聚甲基丙烯酸-(2,2,3,3,4,4,5,5-八氟)戊酯(PIB-b-PDMAEMA-b-POFPMA),对PIB60-b-PDMAEMA63-b-POFPMA11的物理化学性质和成膜性能进行了研究.利用1H-NMR和GPC表征了聚合物的化学结构、分子量及分子量分布;通过TGA和DSC测试了聚合物的热分解温度与玻璃化转变温度(Tg).实验结果表明,PIB60以及PDMAEMA63的Tg分别为-61℃和5℃,PIB60-b-PDMAEMA63在-4℃左右存在一个Tg,而PIB60-b-PDMAEMA63-b-POFPMA11不仅在-4℃存在玻璃化转变,而且在26℃存在另一个玻璃化转变,对应于POFPMA嵌段的Tg.将聚合物制成薄膜,通过接触角测试发现聚合物薄膜具有一定的疏水疏油性质.根据Owens-Wendt公式计算了聚合物薄膜的自由能、分散能和极性能.利用原子力显微镜(AFM)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和X射线衍射分析(XRD)研究了聚合物中含氟嵌段向薄膜表面迁移富集和堆积结构,结果显示,在退火之后,含氟嵌段向薄膜的表面迁移、富集,并在表面排列形成双层堆积结构.

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