Ekstrand K, Ruyter I E, Wellendorf H
NIOM-Scandinavian Institute of Dental Materials, Oslo, Norway.
J Biomed Mater Res. 1987 Sep;21(9):1065-80. doi: 10.1002/jbm.820210902.
The flexural properties of poly(methyl methacrylate) (PMMA) reinforced with carbon/graphite (C/G) fibers with three different surface treatments were investigated by transverse bend testing after dry and wet storage. The fibers used were (1) commercially available fibers, (2) cleaned fibers, and (3) cleaned and sized fibers. The coating agents of commercial unidirectional and braided C/G fibers as well as impurities on C/G fibers for medical uses were characterized by means of high-performance liquid chromatography (HPLC). The agar overlay technique was used to assess the cytotoxicity of leachable elements from different fibers and processed composites. Composites with both unidirectional and braided tubular C/G fibers were investigated after storage in water. Fracture stress and flexural modulus decreased when "commercial" fibers were used as reinforcing material. Composites with cleaned and sized fibers gave only minor differences in flexural properties after dry and wet storage. By means of SEM micrographs the adhesion behavior of unsized C/G fibers, epoxy sized fibers, cleaned fibers, and cleaned and sized fibers were assessed. After water storage a substantial part of the cleaned fibers adhered to the matrix material. The adhesion capacity of the other fibers was reduced since the water absorption caused separation of fiber and matrix.
通过对三种不同表面处理的碳/石墨（C/G）纤维增强聚甲基丙烯酸甲酯（PMMA）在干湿储存后的横向弯曲试验，研究了其弯曲性能。所用纤维分别为：（1）市售纤维；（2）清洁后的纤维；（3）清洁并上浆后的纤维。采用高效液相色谱法（HPLC）对商用单向和编织C/G纤维的涂层剂以及医用C/G纤维上的杂质进行了表征。采用琼脂覆盖技术评估了不同纤维和加工复合材料中可浸出元素的细胞毒性。对单向和编织管状C/G纤维复合材料在水中储存后的情况进行了研究。当使用“市售”纤维作为增强材料时，断裂应力和弯曲模量降低。清洁并上浆后的纤维制成的复合材料在干湿储存后的弯曲性能仅有微小差异。通过扫描电子显微镜（SEM）照片评估了未上浆的C/G纤维、环氧上浆纤维、清洁后的纤维以及清洁并上浆后的纤维的粘附行为。在水中储存后，相当一部分清洁后的纤维粘附在基体材料上。由于吸水导致纤维与基体分离，其他纤维的粘附能力降低。
