Siloxane polymers with quadruple hydrogen bonding units

The invention relates to the synthesis of siloxane polymers containing self-complementary quadruple hydrogen bonding groups (4H-units). The resulting polymers show unique new characteristics that result from the reversible, physical interactions between the polysiloxane chains that are based on the (supramolecular) interactions between the 4H-units. The polysiloxanes in this invention show unprecedented bulk material properties and are used as gelling agents for silicone fluids. The resulting gels are clear and display good material properties, while having unparalleled high silicone fluid contents

Preparation of supramolecular polymers by copolymerization of monomers containing quadruple hydrogen bonding units with regular monomers

The invention relates to the synthesis of polymers contg. self-complementary quadruple H groups by copolymg. monomers contg. a quadruple H bonding group with ³1 monomers of choice. The resulting polymers show unique new characteristics due to the presence of addnl. phys. interactions between the polymer chains that are based on multiple H bonding interactions (supramol. interactions). Thus, 2-isocyanatoethyl methacrylate (7.0 mL) was added to a soln. of 6-(1-ethylpentyl)isocytosine (13.4 g) in dry pyridine (150 mL), the reaction mixt. was stirred under Ar at 80° for 4 h to give a monomer, and was polymerizable with 2-hydroxyethyl methacrylate in the presence of ATRP initiators, CuBr, and bipyridine

Preparation of supramolecular polymers by copolymerization of monomers containing quadruple hydrogen bonding units with regular monomers

The invention relates to the synthesis of polymers contg. self-complementary quadruple H groups by copolymg. monomers contg. a quadruple H bonding group with ³1 monomers of choice. The resulting polymers show unique new characteristics due to the presence of addnl. phys. interactions between the polymer chains that are based on multiple H bonding interactions (supramol. interactions). Thus, 2-isocyanatoethyl methacrylate (7.0 mL) was added to a soln. of 6-(1-ethylpentyl)isocytosine (13.4 g) in dry pyridine (150 mL), the reaction mixt. was stirred under Ar at 80° for 4 h to give a monomer, and was polymerizable with 2-hydroxyethyl methacrylate in the presence of ATRP initiators, CuBr, and bipyridine

Self-assembly and morphology of polydimethylsiloxane supramolecular thermoplastic elastomer

Functionalization of polydimethylsiloxanes (PDMS) polymers with hydrogen-bonding ureidopyrimidinone (UPy) groups leads to supramolecular thermoplastic elastomers. In previous studies, no lateral stacking of UPy dimers was observed in UPy-functionalized polymers, unless additional urethane or urea groups were built into the hard block. However, we have shown that when PDMS is used as the soft block, this lateral aggregation of UPy dimers does take place, since long fibers could be observed in the atomic force microscopy (AFM) phase image. Also in bulk, the presence of these interactions was proven by oscillatory shear experiments. We attribute this aggregation to the incompatibility of soft block and hard block, leading to phase separation. Moreover, we have shown that additional urethane or urea groups in the hard block do lead to materials with more fibers and higher melting points. For the UPy-urea functionalized PDMS even single fibers are observed with AFM when dropcasted from a very diluted solution. When the length of the soft block is increased, the morphology changes from fibrous to spherical. © 2008 Wiley Periodical

Supramolecular ionomers, their preparation, and aqueous compositions

The supramol. ionomers. are polymers having quadruple H bonding units (4H-units) and ionic groups or ionogenic groups within their structure. The supramol. ionomers can be dispersed or solubilized in H2O at high solids contents while maintaining low viscosities, facilitating easy use and processing of the resulting aq. formulations. The aq. supramol. ionomer compns. have excellent film-forming properties. Also, the polymer materials have good mech. properties after drying, as they are not tacky, show high elasticity and low or no creep. [on SciFinder (R)