Provided are a prepreg providing a carbon fiber reinforced material having excellent Mode I interlaminar toughness, Mode II interlaminar toughness, and tensile strength and the carbon fiber reinforced material.
A prepreg includes following constituents [A] to [C] and satisfies following conditions (I) and (II):
[A]: a carbon fiber;
[B]: an epoxy resin; and
[C]: a hardener for [B], and
(I) a surface oxygen concentration O/C of [A] measured by X-ray photoelectron spectroscopy is 0.10 or more; and
(II) a cured product obtained by curing [B] and [C] includes a resin region having molecular anisotropy exhibiting interference fringes in polarizing microscope observation in a crossed Nicol state.
提供了一种预浸料,该预浸料提供了一种具有优异的模式 I 层间韧性、模式 II 层间韧性和抗拉强度的碳纤维增强材料以及碳纤维增强材料。
预浸料包括以下成分[A]至[C],并满足以下条件(I)和(II):
[A]:碳纤维;
[B]:环氧
树脂;以及
[C]:[B]的固化剂,以及
(I) 用 X 射线光电子能谱法测得[A]的表面氧浓度 O/C 为 0.10 或以上;以及
(II) 通过固化[B]和[C]得到的固化物包括具有分子各向异性的
树脂区域,在交叉尼科 尔状态下,在偏振显微镜观察中显示干涉条纹。