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首页> 外文会议>ACS Symposium Series 912; American Chemical Society(ACS) National Meeting; 20040328-0401; Anaheim,CA(US) >Temperature-Responsive Films of Amphiphilic Poly(N-isopropylacryiamides) of Various Architectures at the Air-Water Interface
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Temperature-Responsive Films of Amphiphilic Poly(N-isopropylacryiamides) of Various Architectures at the Air-Water Interface

机译：两性结构的两亲性聚（N-异丙基丙烯酰胺）在空气-水界面的温度响应膜

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摘要

The surface behavior of hydrophobically modified poly(N-isopropylacrylamides) (HM-PNEPAM) was studied by the Langmuir film balance technique in order to explore the role of polymer architecture on the formation and stability of polymeric monolayers. The polymers had similar molecular weight (M_n ～ 15 kDa) and narrow polydispersity (M_w/M_n < 1.1) and belonged to two general families: (ⅰ) graft-PNIPAM derivatives carrying 10 mol% of either n-dodecyl chains or fluorinated n-octyl chains randomly distributed along the polymer backbone and (ⅱ) end-functionalized PNIPAM derivatives bearing one or two terminal n-octadecyl chains. Surface pressure (π)-surface area (A) isotherms were recorded during compression and expansion of polymer monolayers on an aqueous subphase kept at 12 or 20 ℃. We observed that hydrophobic modification stabilizes the PNIPAM monolayers formed at the air/water interface, and that telechelic PNIPAM forms the most robust monolayers. Polymeric monolayers formed at 12 ℃ are less stable than those constructed at 20 ℃, reflecting the increased solubility of PNIPAM in cold water.
机译：通过Langmuir膜平衡技术研究了疏水改性的聚（N-异丙基丙烯酰胺）（HM-PNEPAM）的表面行为，以探讨聚合物结构对聚合物单层形成和稳定性的作用。这些聚合物具有相似的分子量（M_n〜15 kDa）和窄的多分散性（M_w / M_n <1.1），属于两个通用家族：（ⅰ）带有10 mol％正十二烷基链或氟化n-的N-接枝的PNIPAM衍生物。辛基链沿着聚合物主链随机分布，并带有（一个或两个）带有一个或两个末端正十八烷基链的末端官能化PNIPAM衍生物。在保持和保持在12或20℃的水相上压缩和膨胀聚合物单层过程中记录了表面压力（π）-表面积（A）等温线。我们观察到疏水改性可稳定在空气/水界面处形成的PNIPAM单层，而遥螯型PNIPAM形成最坚固的单层。在12℃形成的聚合物单分子层比在20℃形成的聚合物单分子层不稳定，这反映了PNIPAM在冷水中的溶解度增加。

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