| 摘要 |
PROBLEM TO BE SOLVED: To increase strength and modulus of elasticity of a phenol resin fiber useful for industrial raw materials and a carbon fiber prepared by using the resin fiber by including a phenol resin component prepared by using phenols and aldehydes and crystalline components. SOLUTION: This resin fiber comprises a phenol resin component (novolak resin, etc.), prepared by using phenols and aldehydes and a crystalline component (calixarene). The crystalline component is included, normally in an amount of 1-50wt.% and for example, in X ray diffraction using CuKαrays, the resin fiber has three strong lines at angle of 2θ<=25 deg.. Calixarenes are represented by the formula [R is an aromatic group of an alkyl, etc.; (n) is an integer of >=3 (normally <=12)].
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