National Institute of Advanced Industrial Science and Technology

Zeon Corporation

Seisuke Ata

Kenji Hata

Shigeki Tomonoh

Masaaki Komatsu

Kazufumi Kobashi

Anna Komatsu

Provided is a cross-linked rubber that can improve long-term sealing properties of a seal member in high-temperature and high-pressure environments. The cross-linked rubber is obtained through cross-linking of a cross-linkable rubber composition containing a fluororubber, carbon black, one or more carbon nanotubes, and an organic peroxide cross-linker, and has a 50% modulus of 5 MPa or more, a compression set (230&#xb0; C., 500 hours) of 80% or less, and a rate of change of elongation at break between before and after a heat aging test (230&#xb0; C., 72 hours) of not less than &#x2212;10% and not more than 10%.

Cross-linked rubber and production method therefor

A carbon nanotube-elastomer composite material according to the present invention is produced by dispersing a carbon nanotube in an elastomer, including a carbon nanotube having a diameter of 20 nm or less, the number of layers of 10 or less, the carbon nanotube being contained in an amount of 0.1 to 20 parts by weight inclusive relative to the total weight of the carbon nanotube and the elastomer, and a continuous network having a Va/Vvalue of 0.5 or more is formed in the elastomer wherein Vrepresents the initial volume of the composite material and Va represents the volume of the structure formed from the remaining carbon nanotubes when the composite material is maintained at a temperature of 400&#xb0; C. or higher for 6 hours while introducing nitrogen, the elastomer is thermally decomposed and the remaining carbon nanotubes form a structure.

Carbon nanotube-elastomer composite material, seal material and sealing material each produced using same, and method for producing carbon nanotube-elastomer composite material

Provide is a carbon nanotube composite material and conductive material to solve the problems of the prior art described above by providing a high conductivity and showing excellent durability against repeated stress such as strain. A carbon nanotube composite material of the invention is a conductive material having carbon nanotubes dispersed in a matrix including observing a peak in each region of 110&#xb1;10 cm, 190&#xb1;10 cmand 200 cmor more in a Raman spectroscopic analysis at a wavelength of 633 nm, and a ratio R/Rof an electrical resistance R after a load of repeated stress of 100 times at 10% elongation with respect to an electrical resistance Rprior to applying a load is 5 or more. In addition, a conductive material of the invention comprises these characteristics of the carbon nanotube composite material.

Carbon nanotube composite material and conductive material

A CNT composite material includes a CNT group and carbon fibers dispersed in a matrix, the CNT composite material includes 0.01 wt % or more and 30 wt % or less of CNT aggregate. The CNT group includes a three dimensional network structure with a size of 10 &#x3bc;m or more and has a maximum distribution range of a differential pore volume of 0.01 &#x3bc;m or more and 10 &#x3bc;m or less in a range of 4 nm or more and 1000 &#x3bc;m or less of a pore diameter. The carbon fibers have a maximum distribution range of a differential pore volume of 1 &#x3bc;m or more and 100 &#x3bc;m or less in a range of 4 nm or more and 1000 &#x3bc;m or less of a pore diameter. A total specific surface area of the CNT aggregate and the carbon fibers is 10 m/g or more and 500 m/g or less.

Growing community of inventors

Tsukuba, Japan

Seisuke Ata