Versatile Quasi-Block Copolymers Based on a Universal Chain Stopper functionality

Rajashekharayya Sanguramath, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
Roy Shenhar, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel

Quasi-block copolymers (q-BCPs) are new family of block copolymers which consist of a conventional and a supramolecular block.^1-3In their simplest design, q-BCPs are formed by a conventional polymer terminated with a monofunctional supramolecular unit with a strong affinity for self-complementary bifunctional molecules which would then form the supramolecular block. However, our previous approach to q-BCPs lacked functional versatility in terms of design, as the conventional block was selective to only one particular type of bifunctional supramolecular monomers, which further adds synthetic complexity. So a new approach to versatile design with a general chain stopper ability to numerous supramolecular monomers was sought in the work described in this poster.

Anionic conventional block, sulfonate-terminated polystyrene (PS-SO₃Li) was proposed and confirmed to serve as a general chain stopper for various urea based hydrogen bonding supramolecular polymers, in particular to bis(ethyl-2-hexylureido)toluene (EHUT) and bis-ureidopyrimidinone (bis-UPy) systems investigated in this work. The q-BCPs synthesized with different composition ratios between conventional block and the supramolecular block were characterized and unambiguously confirmed first by ¹H-DOSY experiments and then by measuring the resultant viscosities of the solutions. In this poster, detailed solution state characterizations and brief thin film studies of q-BCPs will be discussed.

References

(1) Daoulas, K. C.; Cavallo, A.; Shenhar, R.; Müller, M. Soft Matter 2009, 5, 4499.

(2) Daoulas, K. C.; Cavallo, A.; Shenhar, R.; Müller, M. Phys. Rev. Lett. 2010, 105, 108301.

(3) Weiss, E.; Daoulas, K. C.; Müller, M.; Shenhar, R. Macromolecules 2011, 44, 9773.


Versatile Quasi-Block Copolymers Based on a Universal Chain Stopper functionality Rajashekharayya Sanguramath, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel Roy Shenhar, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel Quasi-block copolymers (q-BCPs) are new family of block copolymers which consist of a conventional and a supramolecular block.^1-3In their simplest design, q-BCPs are formed by a conventional polymer terminated with a monofunctional supramolecular unit with a strong affinity for self-complementary bifunctional molecules which would then form the supramolecular block. However, our previous approach to q-BCPs lacked functional versatility in terms of design, as the conventional block was selective to only one particular type of bifunctional supramolecular monomers, which further adds synthetic complexity. So a new approach to versatile design with a general chain stopper ability to numerous supramolecular monomers was sought in the work described in this poster. Anionic conventional block, sulfonate-terminated polystyrene (PS-SO₃Li) was proposed and confirmed to serve as a general chain stopper for various urea based hydrogen bonding supramolecular polymers, in particular to bis(ethyl-2-hexylureido)toluene (EHUT) and bis-ureidopyrimidinone (bis-UPy) systems investigated in this work. The q-BCPs synthesized with different composition ratios between conventional block and the supramolecular block were characterized and unambiguously confirmed first by ¹H-DOSY experiments and then by measuring the resultant viscosities of the solutions. In this poster, detailed solution state characterizations and brief thin film studies of q-BCPs will be discussed. References (1) Daoulas, K. C.; Cavallo, A.; Shenhar, R.; Müller, M. Soft Matter 2009, 5, 4499. (2) Daoulas, K. C.; Cavallo, A.; Shenhar, R.; Müller, M. Phys. Rev. Lett. 2010, 105, 108301. (3) Weiss, E.; Daoulas, K. C.; Müller, M.; Shenhar, R. Macromolecules 2011, 44, 9773.

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