Structural Investigation of Micelles Formed by an Amphiphilic PEP−PEO Block Copolymer in Water
Structural Investigation of Micelles Formed by an Amphiphilic PEP−PEO Block Copolymer in Water
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两亲性 PEP−PEO 嵌段共聚物在水中形成的胶束的结构研究
DOI：
10.1021/ma970470m
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发表时间：
1997
期刊：
影响因子：
5.5
通讯作者：
D. Richter
中科院分区：
文献类型：
--
作者：
A. Poppe;L. Willner;J. Allgaier;J. Stellbrink;D. Richter
用小角中子散射（SANS）、动态光散射（DLS）和粘度法研究了聚（乙烯-丙烯）-聚（环氧乙烷）嵌段共聚物（PEP-PEO）在水中的胶束。嵌段共聚物由部分氘代PEP嵌段和含氢PEO嵌段组成，总分子量为11.1 × 103。在四个对比度下进行SANS测量，以获得关于胶束聚集体的详细结构信息。不同的散射曲线可以很好地描述一个球核-壳模型，在两个部分都有恒定的密度。聚合物密度分布的尖锐边缘通过与Q空间中的高斯相乘而模糊。该模型得到的核心半径为RC = 176 A，总胶束半径为RM = 294 A。涂抹范围分别为11和32 A。拟合进一步得到聚合数P = 2430。DLS测量揭示了一个狭窄的单峰分布的弛豫频率，表明…
Micelles of a poly(ethylene-co-propylene)-block-Poly(ethylene oxide) (PEP−PEO) copolymer in water were investigated by small angle neutron scattering (SANS), dynamic light scattering (DLS), and viscometry. The block copolymer was built of a partially deuterated PEP block and a hydrogeneous PEO block with an overall molecular weight of 11.1 × 103. The SANS measurements were performed at four contrasts in order to get detailed structural information about the micellar aggregates. The different scattering curves could be described very well by a spherical core−shell model with constant density in both parts. The sharp edges of the polymer density distribution were smeared by multiplication with a Gaussian in Q-space. The model yielded a core radius of RC = 176 A and an overall micellar radius of RM = 294 A. The smearing ranges were 11 and 32 A, respectively. The fit further yielded an aggregation number of P = 2430. DLS measurements reveal a narrow monomodal distribution of relaxation frequencies, indicating...