發(fā)布時(shí)間：2018-03-14 02:43

  本文選題：嵌段共聚物　切入點(diǎn)：伸展鏈　出處：《高分子學(xué)報(bào)》2016年04期 　論文類型：期刊論文

【摘要】：采用聚苯乙烯-b-聚甲基丙烯酸甲酯嵌段共聚物(PS-b-PMMA)的甲苯稀溶液滴膜法制備PMMA伸展鏈,用原子力顯微鏡觀察了PMMA分子鏈形貌及其在丙酮、水蒸氣退火后的構(gòu)象轉(zhuǎn)變.結(jié)果表明,濃度(聚合物質(zhì)量/溶液質(zhì)量)為1×10~(-6)的PS-b-PMMA甲苯溶液可以在云母基底表面制備出高度為0.2 nm、長(zhǎng)度為100~300 nm的PMMA伸展鏈;該方法可以適用于不同分子量的PS-b-PMMA共聚物,當(dāng)PMMA嵌段分子鏈大于PS時(shí),更容易制備高度伸展的PMMA分子鏈.丙酮蒸氣退火可使膠束中的PMMA伸展鏈迅速收縮并與PS核融為一體變成球形結(jié)構(gòu).水蒸氣退火作用下PMMA分子鏈的構(gòu)象轉(zhuǎn)變與制備膠束的起始濃度有關(guān),濃度為1×10~(-6)的膠束只形成球狀結(jié)構(gòu);濃度為5×10~(-6)的膠束含有較多的PMMA伸展鏈,在水蒸氣退火后可形成花狀膠束并可以組裝成周圍帶有臺(tái)階狀PMMA分子層的棒狀膠束.
[Abstract]:The PMMA stretching chain was prepared by using the toluene dilute solution dripping method of polystyrene-b-polymethyl methacrylate block copolymer (PS-b-PMMA). The morphology of PMMA molecular chain and its conformation transition after acetone and steam annealing were observed by atomic force microscope. PS-b-PMMA toluene solution with concentration (polymer mass / solution mass) of 1 脳 10 ~ (-1) can be used to prepare PMMA extensional chains with a height of 0.2 nm and a length of 100 ~ 300nm on the surface of mica substrate. This method can be applied to PS-b-PMMA copolymers with different molecular weights. When the PMMA block chain is larger than PS, It is easier to prepare highly stretched PMMA chain. Acetone vapor annealing can make the PMMA stretch chain in micelle shrink rapidly and melt with PS nucleus into a spherical structure. Conformational transition and preparation of PMMA Molecular chain under Water Vapor annealing. The starting concentration of the micelles, The micelles with a concentration of 1 脳 10 ~ (-6) only formed a spherical structure, and the micelles with a concentration of 5 脳 10 ~ (10 ~ (-6)) contained more PMMA stretching chains, which formed flower-like micelles after steam annealing and could be assembled into rod-like micelles with step PMMA molecular layers around them.
【作者單位】： 遼寧工程技術(shù)大學(xué)材料科學(xué)與工程學(xué)院;哈爾濱工業(yè)大學(xué)材料物理與化學(xué)系;
【基金】：國(guó)家自然科學(xué)基金(基金號(hào)51403094)資助項(xiàng)目
【分類號(hào)】：O633.14

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