高强度氧化石墨烯/高取代羟丙基纤维素/聚乙烯醇复合水凝胶的辐射制备及其机械性能

Radiation preparation and mechanical properties of a high-strength graphene oxide/highly substituted hydroxypropyl cellulose/polyvinyl alcohol composite hydrogel

以聚乙烯醇(PVA)、高取代羟丙基纤维素(HHPC)、氧化石墨烯(GO)为原料,合成高强度氧化石墨烯基复合水凝胶。采用冷冻-解冻法和辐照交联技术探讨吸收剂量和GO掺杂量对复合水凝胶机械性能的影响。利用扫描电镜、材料试验机、X射线衍射仪、傅里叶变换红外光谱、热重分析仪等表征手段分析GO的掺杂量对HHPC/PVA水凝胶微观结构和组成的影响。结果表明:当吸收剂量为60 kGy、GO填充量为0.36 mg/g时,GO/HHPC/PVA复合水凝胶机械强度高达3.5 MPa,溶胀度达5.3%,凝胶分数达81.65%。该水凝胶有望在组织工程、生物医学等方面得到应用。

Using polyvinyl alcohol(PVA),highly substituted hydroxypropyl cellulose(HHPC),and graphene oxide(GO)as raw materials,a high-strength GO composite hydrogel was synthesized.The effects of the absorbed dose and GO doping on the mechanical properties of the composite hydrogels were investigated via freeze-thawing and irradiation crosslinking.The effects of GO doping on the microstructure and composition of the HHPC/PVA hydrogel were analyzed using scanning electron microscopy,a material testing machine,X-ray diffraction,Fourier transform infrared spectroscopy,thermogravimetry,and other characterization methods.For an absorbed dose of 60 kGy and GO filling amount of 0.36 mg/g,the GO/HHPC/PVA composite hydrogel exhibited the highest mechanical strength(up to 3.5 MPa),excellent swelling degree(5.3%),and high gel fraction(81.65%).Therefore,the hydrogel is expected to have applications in fields such as tissue engineering and biomedicine.