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Metal-free living cationic polymerization
A useful metal-free living cationic polymerization of various vinyl ethers using ether-associated hydrogen chloride is first reported. The molecular weight of polymers obtained through this synthetic protocol can be controlled by the feed ratio of the monomer to HCl.
Sugihara et al., J. Polym. Sci. A Polym. Chem., 46, 1913–1918, 2008.
Sugihara et al., Polym. Bull., 64, 209–220, 2009.
Sugihara et al., Polym. Chem., 7, 6854–6863, 2016.
Yamawaki et al., ACS Macro Lett., 6, 381–385, 2017.
Transformation from cationic polymerization to RAFT polymerization
We are proposing various types of transformations using macro-chain transfer agents in order to embed unique functions into polymer materials, such as thermoresponsibility and self-organization. We have recently reported a RAFT cationic polymerization (MRCP), followed by one-pot transformation from the MRCP to RAFT radical polymerization.
Sugihara et al., J. Am. Chem. Soc., 141, 13954-13961, 2019.
Sugihara et al., Macromolecules, 51, 1260-1271, 2018.
Sugihara et al., Macromolecules, 50, 8346-8356, 2017.
Sugihara et al., Macromolecules, 49, 1563-1574, 2016.
Sugihara et al., Macromolecules, 48, 5120-5131, 2015.
Polymerization induced self-assembly
Amphiphilic diblock copolymers are known to form a wide range of nanostructures (spheres, worms, vesicles, etc.) in solvents that are selective for one of the blocks. However, such self-assembly is usually limited to dilute copolymer solutions (<1%), which is a significant disadvantage for potential commercial applications, such as drug delivery and coatings. We overcome this concentration limitation by the polymerization-induced block copolymer self-assembly.
Sugihara et al., Polym. J., 53, 309-321, 2021.
Sugihara et al., Langmuir, 35, 1346-1356, 2019.
Sugihara et al., Macromolecules, 51, 1260-1271, 2018.
Shinji Sugihara, KOBUNSHI RONBUNSHU, 69, 567-579, 2012.
Sugihara et al., J. Am. Chem. Soc., 133, 15707-15713, 2011.
Sugihara et al., Soft Matter, 7, 10787-10793, 2011.
Molecular design for stimuli-responsive polymers
With the knowledge of precise polymerization and the ability of manipulating the location of functional groups, we attempt to synthesize polymers with desired thermal responses, such as lower critical solution temperature. We also design thermo-responsive polymers in order to understand the underlying molecular mechanism for the thermal response of polymers.
Sugihara et al., Macromolecules, 50, 8346-8356, 2017.
Ma'Radzi et al., Polymer, 55, 1920-1930, 2014.
Sugihara et al., Polymer, 54, 1043-1052, 2013.
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