Phase Diagrams of Blends of Polyisobutylene and Deuterated Polybutadiene as a Function of Chain Length

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• 作者：Alisyn J. Nedoma ; Peggy Lai ; Andrew Jackson ; Megan L. Robertson ; Nisita S. Wanakule ; Nitash P. Balsara
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：April 26, 2011
• 年：2011
• 卷：44
• 期：8
• 页码：3077-3084
• 全文大小：864K
• 年卷期：v.44,no.8(April 26, 2011)
• ISSN：1520-5835

文摘

Phase diagrams of four binary blends of polyisobutylene (component 1) and deuterated polybutadiene (component 2) were determined using small-angle neutron scattering (SANS). Our study covers N₁/N₂ values ranging from 0.23 to 0.92 and N_i ranging from about 800 to 3600 (N_i is the number of monomers per chain of component i based on a reference volume = 0.1 nm³). The experimentally determined binodal curves were in good agreement with the predictions based on the Flory鈭扝uggins theory using a previously determined composition- and chain-length-dependent Flory鈭扝uggins interaction parameter presented in llauthors">Nedomaet al. Macromoleculeslass="NLM_x"> 2008lass="NLM_x">, 41lass="NLM_x">, 5773鈭?779. The experimentally determined spinodal curves, which were surprisingly close to the experimental binodal curves, deviated significantly from predictions, an observation for which we offer no quantitative explanation.