Abstract:
An epoxidized block copolymer (E) produced by epoxidizing a block copolymer (C) comprising a polymer block (A) mainly made from an aromatic vinyl compound and a polymer block (B) mainly made from a conjugated diene compound or a product (D) of hydrogenation of the copolymer (C) and satisfying at least one of the following requirements (1), (2) and (3): (1) the molar ratio R is 0.001 to 0.1, R being defined by the formula: R = [hydroxyl]/[epoxy] (wherein [hydroxyl] is the number of moles of hydroxyl groups contained per unit weight of the epoxidized block copolymer and [epoxy] is that of epoxy groups); (2) the gel content is 5 wt.% or below; and (3) the chloride ion content is 7 ppm or below. The above copolymer (E) can be produced by epoxidizing the block copolymer (C) or (D) in an organic solvent and removing the solvent by evaporation. Compositions comprising the copolymer (E) and other compounds and/or resins are useful.
Abstract:
A block copolymer composed of an aromatic vinyl compound polymer block, a butadiene polymer block and an isoprene polymer block. It has the weight-average molecular weight of 10,000 to 500,000, the content of the bonded aromatic vinyl compound of 10-50 wt.%, the content of the bonded butadiene of 10-60 wt.%, the content of the bonded isoprene of 10-60 wt.%, the content of the 1,2-vinyl bonds in the butadiene portion of 15 % or less, the content of the 3,4-vinyl bonds in the isoprene portion of 10 % or less, the storage modulus of 106-3x108 Pa according to viscoelasticity measurement in the temperature range of 0 to 50 C, only one peak of the loss tangent due to the butadiene and isoprene polymer blocks in the temperature range of -80 to -50 C, and a reduced change in the melt viscosity with time. The invention also provides a pressure-sensitive adhesive composition comprising the above copolymer and a tackifier.
Abstract:
There are disclosed novel, solid, elastomeric block copolymers with improved resistance to cold flow wherein either 1) the terminal blocks are each a polymer (I polymer) of at least one conjugated diene (I), e.g., isoprene, which contains at least five carbon atoms with at least one of each pair of double-bonded carbon atoms in the polymerized diene I units being additionally single-bonded to two carbon atoms; at least one middle or interior block is a hydrogenated polybutadiene (B polymer); and at least one middle or interior block is an essentially straight chain polyethylene (E polymer) resulting from the hydrogenation of a polybutadiene composed of at least 80 % of 1,4- units; or 2) the terminal blocks are random copolymers resulting from the hydrogenation of a copolymer of at least one diene I as previously defined and hydrogenated butadiene, and at least one middle or interior block is a straight chain polyethylene (E polymer) as previously defined. The hydrogenated butadiene units in the B polymer or random IB polymer blocks are composed of no more than about 65 % of 1,4- units and at least about 35 % of 1,2- units. The foregoing block copolymers may be prepared by selectively hydrogenating substantially all the butadiene units of a precursor block, copolymer wherein the precursor blocks of the straight chain polyethylene block units are polybutadiene blocks in which at least about 80 % of the butadiene units are 1,4- units. A sufficient number of I units in the I polymer blocks or random IB copolymer blocks retain their unsaturation on selective hydrogenation to enable the vulcanization of the block copolymer.
Abstract:
Radial block copolymers characterized by the formulae: (1) (pS-pI)nX and (2) (pS-pI-pB)nX where pS is polystyrene, pI is polyisoprene, pB is butadiene, X is a residue of a multifunctional coupling agent used in the production of the radial block copolymer, and n is a number greater than 2 representative of the number of branches appended to X; hot-melt adhesive compositions constituted of said radial block copolymers, and articles of manufacture produced therefrom. These compolymers possess blocks of high average molecular weight polystyrene (10,000 to 25,000) and an overall average molecular weight (90,000 to 380,000) such that when blended in requisite proportions with a compatible tackifier resin, preferably also a secondary tackifying resin or plasticizing oil, and stabilizer, superior hot-melt adhesive compositions can be formed. The hot-melt adhesive compositions possess, inter alia, superior heat resistance, superior static time to failure with low viscosity, good peel adhesion, good tack, and high ability to bond to a polyethylene or polypropylene substrate at temperatures below that which may damage the substrate.
Abstract:
Disclosed are compositions, devices, systems and fabrication methods for stretchable composite materials and stretchable electronics devices. In some aspects, an elastic composite material for a stretchable electronics device includes a first material having a particular electrical, mechanical or optical property; and a multi-block copolymer configured to form a hyperelastic binder that creates contact between the first material and the multi-block copolymer, in which the elastic composite material is structured to stretch at least 500% in at least one direction of the material and to exhibit the particular electrical, mechanical or optical property imparted from the first material. In some aspects, the stretchable electronics device includes a stretchable battery, biofuel cell, sensor, supercapacitor or other device able to be mounted to skin, clothing or other surface of a user or object.
Abstract:
The present invention relates to a polymer blend comprising 75-99.5 % (w/w) of at least one poly(lactic acid) (PLA) and 0.5-25 % (w/w) of at least one styrene butadiene copolymer containing at least 50 % (w/w) styrene. The present invention further relates to the use of such polymer blend for producing products and to the resulting products. Moreover, an object of the present invention is the use of a styrene butadiene block copolymer having a dendrimer structure comprising 50-85 % (w/w) styrene as an additive of polymer blends comprising at least 50% (w/w) of PLA and a method of producing the polymer blend according to the invention.
Abstract:
Provided herein are methods of formulating and engineering block copolymer (BCP) systems for directed self-assembly (DSA) processes. In some embodiments, the methods involve engineering a BCP material based on the interaction parameter (ϰ) of the material and the surface and/or interaction energies of its constituent blocks. Also provided are novel block BCP materials that can be used in DSA techniques. In some embodiments, the BCP systems described herein have micro-phase separating blocks, with at least one block including multiple types of repeat units. Also provided are structures formed by DSA, including structures having a sub-20 nm dimension. Applications included nanolithography for semiconductor devices, fabrication of cell-based assays, nanoprinting, photovoltaic cells, and surface-conduction electron-emitter displays.
Abstract:
Matériau présentant une structure macroscopique de type lamellaire et non centro-symétrique, essentiellement constitué par un mélange d'au moins deux populations d'objets hétérogènes par blocs le long d'un axe, constitués chacun d'au moins deux blocs, caractérisé en ce que chacun desdits objets est lié à des objets adjacents par des interactions impliquant au moins deux blocs incompatibles entre eux dudit objet et deux blocs compatibles un à un avec les premiers dits blocs et incompatibles entre eux le long de la chaîne de chaque dit objet adjacent. Les objets peuvent notamment être des co-polymères ou co- oligomères à blocs.
Abstract:
The present disclosure relates to a process for neutralizing a sulfonated block copolymer with a metal compound, to metal-neutralized block copolymers, and to various articles comprising the metal-neutralized block copolymers, e.g., in form of a water vapor permeable membrane which comprises the metal-neutralized block copolymers. The present disclosure further relates to a means and a method for storing and stabilizing a polar component such as a metal compound in a non-polar liquid phase by immuring the polar component in micelles of the sulfonated block copolymer in the non-polar liquid phase.