Abstract:
Materials prepared from polydienes, such as poly(cyclohexadiene), and hydrophilic polymers, such as poly(alkylene oxide), are described. Methods of making the materials and their use in fuel cell membranes, batteries, breathable chemical-biological protective materials, and templates for sol-gel polymerization are also provided. The materials can be crosslinked and sulfonated, and can include copolymers and polymer blends.
Abstract:
A nanostructure formation process that includes the step of polymerizing a diene under conditions suitable to yield a structure having at least one dimension ranging from 1 to 100 nanometers. More specifically, the self-assembly of block copolymers of styrene and 1,3-cyclohexadiene is exploited to form a cylinder-in-cylinder morphology, followed by crosslinking of poly(cyclohexadiene) (PCHD) and removal of the polystyrene (PS) segments, as a means for producing novel functionalized PCHD nanotubes. PCHD may be aromatized to poly(phenylene) (PP), a strong, crystalline, and thermally stable engineering polymer. These materials characterized in terms of their sizes, shapes, surface chemistry and mechanical properties. Composites incorporating these nanotubes can be used in a new class of robust, lightweight, high strength materials.
Abstract:
Bis phenolate transition metal complexes are disclosed for use in alkene polymerization, with optional chain transfer agent, to produce polyolefins.
Abstract:
A metal complex of the formula (1) CyAMX(L) n wherein Cy is a cyclopentadienyl-type ligand, M is a metal of group 4; A is an amidine-containing ligand moiety, represented by formula 2: wherein the amidine-containing ligand is covalently bonded to the metal M via the imine nitrogen atom, and Sub1is a substituent comprising a group 14 atom through which Sub1is bonded to the imine carbon atom and Sub2 is a substituent comprising a heteroatom of group 15, through which Sub2 is bonded to the imine carbon atom; X is an allyl borateligandderived from a conjugated diene ligand, D, and a borane, B and L is a neutral Lewis basic ligand wherein the number of said metal ligands "n" is in the range of 1 to the amount that specifies the 18-electron rule.
Abstract:
Copolymers of fluorinated polydienes and sulfonated polystyrene and their use in fuel cell membranes, batteries, breathable chemical-biological protective materials, and templates for sol-gel polymerization.
Abstract:
A cyclic conjugated diene polymer wherein the main chain comprises the units of at least one cyclic conjugated diene monomer alone or a mixture thereof with the units of at least one other monomer copolymerizable with the diene monomer, wherein the diene monomer units are linked to each other in the main chain through 1,2- and 1,4-bonds in a comparatively high molar ratio of the 1,2-bond to the 1,4-bond, and which has a comparatively narrow molecular weight distribution and improved thermal and mechanical characteristics. The invention also discloses an industrially advantageous process for producing the diene polymer having such excellent features by using a specific catalyst.
Abstract:
A modified polymer containing a cyclic molecular structure unit represented by general formula (I) and having a number-average molecular weight of 10,000 to 5,000,000, wherein A to F represent monomer units constituting the main chain of the polymer and they may be arranged in an arbitrary order; l to q represent each the content (wt.-%) of the respective monomer unit A to F based on the total weight of the units A to F; A represents a cycloolefin monomer unit; B represents a conjugated cyclodiene monomer unit; C and D represent each a monomer unit copolymerizable with A and B; S to X represent modifying groups and each independently comprises a functional group bearing at least one of oxygen, nitrogen, sulfur, silicon, phosphorus and halogen, or an organic acid residue containing the above functional group; and s to x represent each the content (wt.-%) of the respective group S to X. The polymer has excellent thermal characteristics and various types of modified polymer can be provided by copolymerizing various monomers in arbitrary proportions and forms in accordance with required thermal and mechanical characteristics.