Synthesis of microspheres with ‘hairy-ball’ structures from poly(styrene-b-2-vinyl pyridine) diblock copolymers
Synthesis of microspheres with ‘hairy-ball’ structures from poly(styrene-b-2-vinyl pyridine) diblock copolymers
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由聚(苯乙烯-b-2-乙烯基吡啶)二嵌段共聚物合成具有“毛球”结构的微球
DOI：
10.1016/0032-3861(92)90024-q
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
K. Ishizu
中科院分区：
文献类型：
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作者：
R. Saito;Hidefumi Kotsubo;K. Ishizu
以1,1,2 -三氯乙烷为溶剂，在聚（苯乙烯-b-2-乙烯基吡啶）[P (S-b-2Vp), M′n= 3.2× 10 5, 2Vp= 15.5 mol%]二嵌段共聚物薄膜上交联聚（2-乙烯基吡啶）球形微畴，合成了具有“毛状球”结构的单分散微球。随着反应时间的延长，微球的收率提高到80.8 wt%。微球的数平均外径为50 nm，微球硬度高，呈球状。交联后，P2Vp球的数平均直径（D′n）由起始嵌段共聚物膜的D′n （30.3 nm）减小到24 nm。这是由于通过纯化交联产物去除了未交联的嵌段共聚物链。在254 nm处进行折射率和紫外双检测的gpc测量，发现微球的表面性质与PS非常相似。PS链在P2Vp球上展开，微球的实际拉伸度和理论拉伸度（分别为1.13和1.12）符合得很好。
Monodispersed microspheres with ‘hairy-ball’structures were synthesized by crosslinking poly (2-vinyl pyridine) spherical microdomains in poly (styrene-b-2-vinyl pyridine)[P (S-b-2Vp), M ̄ n= 3.2× 10 5, 2Vp= 15.5 mol%] diblock copolymer film cast from 1, 1, 2-trichloroethane solution. The yield of the microspheres increased to 80.8 wt% with increasing reaction time. The number-average external diameter of the microspheres was 50 nm and the microspheres were stiff and truly spherical. After crosslinking, the number-average diameter of the P2Vp ball (D ̄ n) decreased to 24 nm from the D ̄ n of the starting block copolymer film (30.3 nm). This was due to the removal of the uncrosslinked block copolymer chains by purification of the crosslinked products. From the gpc measurement with refractive index and uv double detected at 254 nm, the surface property of the microspheres was found to be very similar to that of PS. PS chains were expanded on the P2Vp ball, and the observed and theoretical degrees of stretching of the microsphere (1.13 and 1.12, respectively) were in good agreement.