Selectively thermally cleavable fluorinated side chain block copolymers : Surface chemistry and surface properties
Selectively thermally cleavable fluorinated side chain block copolymers : Surface chemistry and surface properties
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DOI：
10.1021/ma990828
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发表时间：
2000-01
期刊：
影响因子：
5.5
通讯作者：
A. Böker;K. Reihs;Jianguo Wang;R. Stadler;C. Ober
中科院分区：
文献类型：
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作者：
A. Böker;K. Reihs;Jianguo Wang;R. Stadler;C. Ober
以苯乙烯和异戊二烯为原料，通过顺序阴离子聚合，合成了一系列单分散聚(苯乙烯-b-异戊二烯[-g-全氟酰基])嵌段共聚物。全氟化酯侧链与异戊二烯嵌段的剩余双键通过氧化硼氢化和相应的全氟酸氯酯化反应连接到异戊二烯嵌段的剩余双键上。纯聚合物或聚苯乙烯共混物的表面在最高100A范围内表现出明显的全氟化侧链的部分表面过剩，这取决于表面制备和嵌段共聚物的组成。因此，这些表面是高度疏水的，具有高达122°的推进水接触角。当样品加热到340°C时，可以通过热酯裂解选择性地切割全氟侧链，使聚合物的主链完全保持不变。结果表明，合成的聚苯乙烯-b-异戊二烯聚合物表面的疏水性被逆转为向前推进的方向。
A series of monodisperse poly(styrene-b-isoprene[-g-perfluoroacyl]) block copolymers was synthesized by sequential anionic polymerization of styrene and isoprene. The perfluorinated ester side chains were attached to the remaining double bonds of the isoprene block via oxidative hydroboration and esterification of the resulting alcohol by the corresponding perfluorinated acid chloride. Surfaces of the pure polymers or blends in polystyrene exhibit a notable fractional surface excess of the perfluorinated side chains within the uppermost 100 A depending on the surface preparation and the block copolymer composition. Thus, these surfaces are highly hydrophobic having advancing water contact angles of up to 122°. When samples are heated to 340 °C, the perfluorinated side chains can be selectively cleaved off by a thermal ester cleavage, leaving the backbone of the polymer completely intact. As a result, the hydrophobicity of the resulting poly(styrene-b-isoprene) polymer surface is reversed to an advancing w...