CAJ | 학술논문

论文通过溶液共混法制备了化学共价功能化改性石墨烯片(fGO)掺杂的聚亚苯基砜(PPSU)纳米复合材料(PPSU/fGO)以改善 PPSU 的力学性能、热性能和电性能。所得材料分别通过红外光谱(FT-IR)、原子力显微镜(AFM)、X射线衍射(XRD)、扫描电子显微镜(SEM)、热重分析(TGA)、力学和电学性能测试表征了化学共价功能化改性对石墨烯的影响，以及fGO的含量对PPSU/fGO纳米复合材料的力学性能、热性能、导电性能及断面形貌的影响。研究结果表明：氧化石墨烯已成功获得功能化改性，其在溶剂中能均匀分散和剥离，厚度约为70 nm左右；加入少量的fGO (如≤1%(wt)时，fGO的分散尺寸较小，在基体中分散较均匀，并与PPSU基体有良好的界面结合，可有效发挥fGO对PPSU的增强增韧作用。PPSU/fGO纳米复合材料有较好的力学性能，其中以1%(wt)的fGO含量为最佳，其纳米复合材料的拉伸强度和抗冲击强度分别为207 MPa和72 kJ?m?2，比纯PPSU分别提高了约15%和14%。当fGO含量过高时， fGO 分散尺寸增大，与 PPSU 基体界面作用减弱，导致复合材料拉伸强度和抗冲击性能下降。随着 fGO 含量的增加， PPSU复合材料耐热稳定性能提高。电性能测试表明，当加入1%(wt)的fGO时，复合材料的电导率提高了近8个数量级，其导电逾渗阀值小于1%(wt)。综合考虑复合材料的力学和电性能，fGO的添加量低于1%(wt)为宜。
논문통과용액공혼법제비료화학공개공능화개성석묵희편(fGO)참잡적취아분기풍(PPSU)납미복합재료(PPSU/fGO)이개선 PPSU 적역학성능、열성능화전성능。소득재료분별통과홍외광보(FT-IR)、원자력현미경(AFM)、X사선연사(XRD)、소묘전자현미경(SEM)、열중분석(TGA)、역학화전학성능측시표정료화학공개공능화개성대석묵희적영향，이급fGO적함량대PPSU/fGO납미복합재료적역학성능、열성능、도전성능급단면형모적영향。연구결과표명：양화석묵희이성공획득공능화개성，기재용제중능균균분산화박리，후도약위70 nm좌우；가입소량적fGO (여≤1%(wt)시，fGO적분산척촌교소，재기체중분산교균균，병여PPSU기체유량호적계면결합，가유효발휘fGO대PPSU적증강증인작용。PPSU/fGO납미복합재료유교호적역학성능，기중이1%(wt)적fGO함량위최가，기납미복합재료적랍신강도화항충격강도분별위207 MPa화72 kJ?m?2，비순PPSU분별제고료약15%화14%。당fGO함량과고시， fGO 분산척촌증대，여 PPSU 기체계면작용감약，도치복합재료랍신강도화항충격성능하강。수착 fGO 함량적증가， PPSU복합재료내열은정성능제고。전성능측시표명，당가입1%(wt)적fGO시，복합재료적전도솔제고료근8개수량급，기도전유삼벌치소우1%(wt)。종합고필복합재료적역학화전성능，fGO적첨가량저우1%(wt)위의。
Polyphenylsulfone (PPSU) based nanocomposites filled with chemical covalently functionalized graphene oxide sheets (fGO) were prepared by solution blending in order to improve the mechanical, thermal and electrical properties of PPSU. The effects of chemical covalently functionalization on the graphene oxide sheets, as well as influences offGO content on the mechanical, thermal properties, electroconductive properties and morphology of fractured section of PPSU/fGO nanocomposites were investigated by means of Fourier transform infrared spectroscopy (FT-IR), Atomic force microscope (AFM), X-ray diffraction (XRD), Scanning electron microscope (SEM), thermal gravimetric analysis (TGA), mechanical and electrical conductivity tests separately. The experimental results show that graphene oxide sheets have been functionalized successfully. fGO could be dispersed and exfoliated uniformly with thickness of ~70 nm in the solvent. The incorporation of lower content offGO (i.e,≤1%(wt)) could form smallfGO particles and well disperse in PPSU matrix with good interfacial adhesion, which leads to obviousstrengthen-toughen effects offGO to PPSU matrix. In this case, compared with pure PPSU, the PPSU/fGO nanocomposites have good mechanical properties when their fGO contents are less than 1%(wt), and among them, the PPSU/fGO nanocomposites with 1%(wt)fGO is the best, its tensile strength and impact strength reach 207 MPa and 72 kJ?m?2, which are about 15 % and 14 % higher than that of pure PPSU, respectively. When thefGO content is too high, the size offGO particles increases and its interface adhesive with PPSU decreases, which results in the decrease of tensile and impact strengths of PPSU/fGO nanocomposites. Incorporation offGO would improve the thermal stability of PPSU/fGO nanocomposites. The electrical property test exhibits that the electrical conductivity of PPSU improves significantly when adding 1%(wt)fGO. That is, the PPSU/fGO nanocomposite has a low percolation thresholds value of 1%(wt). Combinating the considerations of the mechanical and electrical properties,fGO addition should be less than 1%(wt).