Association Behavior of Mixed Triblock Copoly(oxyalkylene)s (Type EBE and ESE) in Aqueous Solution

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• 作者：Ná ; gila M. P. S. Ricardo ; Chiraphon Chaibundit ; Zhuo Yang ; David Attwood ; and Colin Booth
• 刊名：Langmuir
• 出版年：2006
• 出版时间：January 31, 2006
• 年：2006
• 卷：22
• 期：3
• 页码：1301 - 1306
• 全文大小：102K
• 年卷期：v.22,no.3(January 31, 2006)
• ISSN：1520-5827

文摘

The micellization of binary mixtures of water-soluble block copolymers E_mB_nE_m and E_mS_nE_m in dilute solution wasinvestigated by light-scattering methods. We use the notation E, B, and S to denote chain units derived, respectively,from ethylene oxide, butylene oxide, and styrene oxide and the subscripts to denote number-average chain lengthsin chain units. Two distinct distributions of micelles were formed in solutions of a 50:50 wt % mixture of copolymersE₆₄B₂₀E₆₄ and E₁₃₇S₁₈E₁₃₇, which had hydrophobic blocks of similar length but very different hydrophobicity. Onedistribution of micelles was formed in solutions of a mixture (50:50 wt %) of copolymers E₁₃₅B₂₀E₁₃₅ and E₈₂S₉E₈₂,which had hydrophobic blocks of different length but similar hydrophobicity. In this case, the properties of the micellesformed in solutions of the mixture were very similar to those of micelles of E₈₂S₉E₈₂ alone. This result extended toconcentrated solutions, because the hard-gel boundary for the mixture proved to be very similar to that of solutionsof E₈₂S₉E₈₂ alone.