Kiyohiro Inoue

Damping performance of polymer blend/organic filler hybrid materials with selective compatibility

Abstract An organic hybrid system consisting of poly(ethyl acrylate) (AR), chlorinated polythylene (CPE), and N , N -dicyclohxyl-2-benzothiazolysulfenamide (DBS) was prepared as a new type of damping material. From the DSC measurements, DBS was supposed to be compatible with CPE and incompatible with AR in an organic hybrid system. Temperature dependence of loss tangent (tan δ ) for the above AR/CPE/DBS hybrids showed double peaks at a temperatures of glass transition region ( T g ). When a component of a weight fraction (wt.%) of AR/CPE/DBS was 37.5:12.5:50, the T g difference (Δ T ) was increased. The damping property of this system characterized by a tan δ peak area (TA) was 62.0, which is more improved than those of single component: 54.8 for only AR, 38.9 for only CPE, respectively. The three-component organic hybrids showed a selective compatibility with CPE and DBS, where we observed a high damping performance in a wide temperature range.

Physical Properties of Polyurethane Blend Dope-Coated Fabrics

We investigate the effects of the cross-sectional structure of a polyester-type polyurethane (pu)/polyvinylchloride (pvc) blend dope-coated nylon fabric on moisture permeability. The waterproof coating is applied by a one-sided wet-coagulation process. The blending of hydrophobic pvc to hydrophilic pu forms a three-layered cross-sectional structure—a pvc-rich micronetwork, a porous pu-rich layer, and the nylon fabric. As the blend ratio of pvc to pu increases, the moisture permeability (mp) and dew condensation (dc) of the coated fabrics improve. Compared to the pu homopolymer, the mp value of a pu/pvc blend in a weight ratio of 4:1 increases 1.18 times to 492 g/m2·h (JIS A-1 method) and 1.16 times to 815 g/m2·h (JIS B-1 method), but the dc value decreases one-fourth to 4.60 g/m2 · h. This gradient three-layered cross-sectional structure contributes to vapor transport properties.