To form mega linear supramolecules by association of telechelic polymers at concentration as low as possible, very long chain lengths are used; telechelic polymers with Mw>400 kg/mol were synthesized to mimic multimillion MW polymers as rheological modifiers�and they did. Building on the Hilmyer-Macosco protocol for ROMP of cyclooctadiene with CTAs bearing end-groups, improvements in monomer purification enabled synthesis of telechelics with unprecedented length. Steady shear viscometry confirmed the dramatic enhancement in the rheological effect brought by longer backbone length. And pairwise associative telechelics showed more potent rheological consequences comparing to self-associative ones; especially in mist-control effect. Mega-linear polymers (Mw > 1e6 g/mol) have been known for decades to suppress mist formation and improve fuel safety under severe impact (Figure 2a). However, their use is limited by �shear degradation,� (Figure 2b). Long pairwise associative polymers are as effective as mega-linears�and have excellent shear resistance (Figure 2d).GPC-MALLS and SANS were performed to study the distributions and structures of supramolecules.

Mega-supramolecules by end-association of very long telechelics: Highly potent rheological modifiers and mist controllers

248th National Meeting (2014)

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