59results about How to "Excellent tensile modulus" patented technology

The invention relates to a polyacrylonitrile-based polymer, containing a polymer of which main component is acrylonitrile, which satisfies at least one kind requirement selected from the following [a] to [d]. [a] Z-average molecular weight (Mz) determined by gel-permeation chromatograph is 800,000 to 6,000,000 and degree of polydispersity (Mz / Mw) (Mw denotes weight average molecular weight) is 3.0 to 10.0. [b] Z+1-average molecular weight (Mz+1) determined by GPC method is 3,000,000 to 10,000,000 and degree of polydispersity (Mz+1 / Mw) is 6.0 to 25.0. [c] Mzm determined by gel-permeation chromatograph[space]multi-angle laserlight scattering photometry is 400,000 to 1,000,000 and degree of polydispersity (Mzm / Mwm) is 3.0 to 10.0. [d] Z-average radius of gyration (Rz) determined by gel-permeation chromatograph[space]multi-angle laserlight scattering photometry is 25 to 45 nm and its ratio to weight average radius of gyration (Rz / Rw) is 1.3 to 2.5.

A polyether polyamide resin composition which contains 15-200 parts by mass of a filler with respect to 100 parts by mass of a polyether polyamide resin in which diamine constituting units are derived from a specific polyether diamine compound and xylylenediamine and dicarboxylic acid constituting units are derived from an α,ω-linear aliphatic dicarboxylic acid having 4-20 carbon atoms.

The invention relates to improved crosslinked polyvinyl chloride structural foam and a preparation method thereof. The foam is prepared from the following materials in portion by weight: 100 portions of polyvinyl chloride resin, 30 to 120 portions of isocyanate, 0.05 to 10 portions of epoxy components, 1 to 12 portions of foaming agent, 0.5 to 10 portions of triazine compound, and 1 to 30 portionsof acid anhydride. The preparation method thereof comprises the following steps: (1) mixing the raw materials evenly to obtain a pasty mixture; (2) pouring the pasty mixture obtained in step (1) intoa die, and fully decomposing the foaming agent to obtain a semi-foaming die pressing block; (3) cooling the semi-foaming die pressing block to room temperature; (4) placing the semi-foaming die pressing block obtained in step (3) into hot bath or steam to carry out swelling; and (5) cooling a swelled semi-finished product obtained in step (4) to room temperature, and then adopting hot water sprayor curing post treatment in the steam to fully react the isocyanate so as to obtain cured block or plate crosslinked polyvinyl chloride structural foam. The foam has fine and even holes, and has goodmechanical property and temperature resistance.