BLOCK COPOLYMERS FROM CYCLIC IMINO ETHERS - A NEW CLASS OF NONIONIC POLYMER SURFACTANT
BLOCK COPOLYMERS FROM CYCLIC IMINO ETHERS - A NEW CLASS OF NONIONIC POLYMER SURFACTANT
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DOI：
10.1021/ma00157a006
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发表时间：
1986-03-01
期刊：
影响因子：
5.5
通讯作者：
SAEGUSA, T
中科院分区：
文献类型：
--
作者：
KOBAYASHI, S;IGARASHI, T;SAEGUSA, T
利用环亚胺醚单体阳离子开环聚合的活性，设计和制备了各种类型的环亚胺醚单体嵌段共聚物。制备的嵌段共聚物为AB和BA型二嵌段共聚物(3)和ABA和BAB型三嵌段共聚物（5和9）。所有共聚物均由亲水性链（a嵌段）和亲脂性链（B嵌段）组成。这些链是酰胺型结构。所使用的单体是7个2-取代2-恶唑啉（OZO）和3个（未取代和2个2-取代）5,6-dihydro-4íf-l， 3-恶唑啉（OZI）。2-甲基-2-恶唑啉（MeOZO）最常用于构建iv -乙酰亚胺单元的有效亲水性嵌段。2-正丁基-（浮标），2-正辛基-(OcOZO)， 2-正十二基-(DoOZO)和2-苯基-2-恶唑啉（PhOZO）产生亲脂阻滞。这些嵌段共聚物具有优异的表面活性，因此是一组非离子聚合物表面活性剂。在水中由表面张力(7)反映的表面活性非常高：MeOZO/浮标的AB型二嵌段共聚物的7值低至27.5 dyn/cm， MeOZO/OcOZO的BAB型三嵌段共聚物的7值低至23.7 dyn/cm。目前聚酰胺型表面活性剂的一个特点是它们不显示混浊点。阳离子开环聚合是制备线性聚（iv -酰基亚胺）的一种通用、方便的方法。在对聚（iv -乙酰亚胺）的聚合研究过程中，我们发现聚（iv -乙酰亚胺）具有高度的吸湿性和良好的亲水性。这些发现促使我们从环亚胺醚制备嵌段共聚物，它在同一分子中同时包含亲水和亲脂链，因此有望表现出表面活性剂的性质。本文报道了AB、BA型二嵌段和ABA、BAB型三嵌段的合成及其表面活性剂性能
Varioustypes of block copolymers from cyclic imino ether monomers have been designed and prepared by utilizing the living nature of the cationic ring-opening polymerization of the monomers. Block copolymers prepared are AB and BA type diblock (3) and ABA and BAB type triblock copolymers (5 and 9). All copolymers consist of a hydrophilic chain (A block) and a lipophilic chain (B block). The chains are of an amide type structure. The monomers used are seven 2-substituted 2-oxazolines (OZO) and three (unsubstituted and two 2-substituted) 5, 6-dihydro-4íf-l, 3-oxazines (OZI). 2-Methyl-2-oxazoline (MeOZO) was used most often for construction of an effective hydrophilic blockof an iV-acetylethylenimine unit. 2-n-Butyl-(BuOZO), 2-n-octyl-(OcOZO), 2-n-dodecyl-(DoOZO), and 2-phenyl-2-oxazolines (PhOZO) produce a lipophilic block. These block copolymers exhibit excellent surface activities and, hence, are a group of nonionic polymer surfactants. The surface activities reflected by the surface tension (7) in water are very high: a 7 value as low as 27.5 dyn/cm for an AB type diblock copolymer from MeOZO/BuOZO and 23.7 dyn/cm for a BAB type triblock copolymer from MeOZO/OcOZO. One characteristic of the present polyamide type surfactants is that they do not show a clouding point.Cationic ring-opening polymerization of cyclic imino ethers is a versatile, convenient method to prepare linear poly (iV-acylalkylenimines) 1 During the course of our studies on the polymerization of cyclic imino ethers, we have found that poly (iV-acetylethylenimine) is highly hygroscopic and possesses a good hydrophilic property. These findings prompted us to prepare block copolymers from cyclic imino ethers, which containboth hydrophilic and lipophilic chains in the same molecule and, hence, are expected to exhibit surfactant properties. The present paper reports the synthesis andsurfactant properties of AB and BA type diblock and ABA and BAB type triblock