Type of Document Dissertation Author Loveday, Donald Ray URN etd-10022007-144854 Title Structure-property relationships in novel ionomers Degree PhD Department Chemical Engineering Advisory Committee
Advisor Name Title Wilkes, Garth L. Committee Chair Davis, Richey M. Committee Member Gibson, Harry W. Committee Member Marand, Hervé L. Committee Member McGrath, James E. Committee Member Keywords
Date of Defense 1994-08-29 Availability restricted Abstract
It is observed for the first time that telechelic ionomers based on sulfonated polyisobutylene exhibit primary and secondary SAXS peaks when the molecular weight distribution is narrow (Mw/Mn ca. 1.15). These SAXS peaks are interpreted as due to non-global lamellar or cylindrical ionic domain order. The non-global ordering strongly affects the tensile and dynamic mechanical properties of the ionomer. This effect is attributed to local ionic phase continuity and the concept of restriction of chain motion by the ionic domain.
Triblock copolymer ionomers from t-butyl methacrylate (tBMA) end blocks and polybutadiene or tapered poly(styrenelbutadienel styrene) (tSBS) mid blocks exhibit complex SAXS patterns indicating dispersed spheroidal ionic end block domains in the matrix. TEM shows that ionization of the 9 mol % PtBMA-PBD triblock produces a morphological transformation from unoriented rodlike domains to ionic spheroids.
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