Kamlesh P. Nair
Georgia Institute of Technology
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Publication
Featured researches published by Kamlesh P. Nair.
Chemistry: A European Journal | 2009
Ashootosh V. Ambade; Caroline Burd; Mary Nell Higley; Kamlesh P. Nair; Marcus Weck
We report the synthesis of telechelic poly(norbornene) and poly(cyclooctene) homopolymers by ring-opening metathesis polymerization (ROMP) and their subsequent functionalization and block copolymer formation based on noncovalent interactions. Whereas all the poly(norbornene)s contain either a metal complex or a hydrogen-bonding moiety along the polymer side-chains, together with a single hydrogen-bonding-based molecular recognition moiety at one terminal end of the polymer chain. These homopolymers allow for the formation of side-chain-functionalized AB and ABA block copolymers through self-assembly. The orthogonal natures of all side- and main-chain self-assembly events were demonstrated by (1)H NMR spectroscopy and isothermal titration calorimetry. The resulting fully functionalized block copolymers are the first copolymers combining both side- and main-chain self-assembly, thereby providing a high degree of control over copolymer functionalization and architecture and bringing synthetic materials one step closer to the dynamic self-assembly structures found in nature.
Soft Matter | 2011
Kamlesh P. Nair; Victor Breedveld; Marcus Weck
The mechanical properties of reversible polymer networks have been modulated successfully at room temperature with a high degree of control over a large magnitude exclusively by altering the complementary hydrogen bonding interactions used for the inter-chain crosslinking process. For these studies, norbornene-based copolymers have been synthesized with multiple functional side-chains that offer different hydrogen bonding motifs. By adding small molecule crosslinking agents with complementary motifs to solutions of these copolymers, self-assembled polymer networks with tunable mechanical properties were obtained. The hydrogen bonding motifs utilized in this study are based on thymine/2,4-diaminotriazine and cyanuric acid/Hamilton wedge pairs. It was found that the mechanical properties of the self-assembled polymer networks strongly depend upon the type of hydrogen bonding motif used for the inter-chain crosslinking as well as the concentration of crosslinking agent. We were able to modulate the rheological properties of the networks from highly viscous to highly elastic and vary the dynamic moduli over five orders of magnitude at room temperature. This degree of control over the networks mechanical properties was achieved without changing the copolymer backbone architecture. Finally, competitive hydrogen bonding of various motifs was used to de-crosslink and re-crosslink the network at room temperature through the selective addition of various crosslinking agents. In addition to the more common thermal responsiveness of hydrogen bonded networks, competitive binding offers an additional parameter to control the mechanical properties of the self-assembled polymer networks at ambient temperature.
Macromolecules | 2008
Kamlesh P. Nair; Victor Breedveld; Marcus Weck
Macromolecules | 2011
Kamlesh P. Nair; Victor Breedveld; Marcus Weck
Tetrahedron | 2004
Joel M. Pollino; Kamlesh P. Nair; Ludger P. Stubbs; Jacob Adams; Marcus Weck
Macromolecules | 2006
Kamlesh P. Nair; and Joel M. Pollino; Marcus Weck
Polymeric materials science and engineering | 2009
Marcus Weck; Kamlesh P. Nair; Victor Breedveld
Archive | 2008
Kamlesh P. Nair; Marcus Weck
2008 AIChE Annual Meeting, AIChE 100 | 2008
Kamlesh P. Nair; Marcus Weck; Victor Breedveld
Polymer preprints | 2007
Kamlesh P. Nair; Victor Breedveld; Marcus Weck