摘要
采用多巴胺对短切玻璃纤维(GF)进行表面改性,成功制备了聚多巴胺改性GF(PDA–GF),通过熔融共混方法制备了热塑性聚氨酯弹性体(TPU)/GF复合材料和TPU/PDA–GF复合材料,研究了纤维含量和多巴胺溶液浓度对复合材料力学性能的影响以及纤维与TPU基体之间的相互作用。结果表明,随着纤维含量的增加,复合材料的拉伸弹性模量不断增加,拉伸强度和断裂伸长率却不断降低;多巴胺溶液浓度为0.50g/L时所制备复合材料的拉伸弹性模量、拉伸强度和断裂伸长率分别达到79.12,34.56MPa和495.77%,较TPU/GF复合材料分别提高了24.54%,45.52%和27.76%,且其拉伸弹性模量较TPU提高71.52%,拉伸强度和断裂伸长率与TPU相当。动态流变测试结果显示,在低频区,TPU/PDA–GF复合材料的损耗模量、复数黏度和损耗角正切值明显高于TPU和TPU/GF复合材料,说明改性纤维与TPU基体树脂之间存在较强的相互作用,扫描电子显微镜结果同时也证实了此结论;同样在低频区,TPU/PDA–GF复合材料储能模量最小,结合Han曲线的分析结果,可以得出TPU/PDA–GF复合材料内部存在一种网络结构使得其在测试条件下保持一种均相状态,Cole-Cole曲线的分析结果也证实了这一点。
Short-cut glass fiber (GF) was modified by dopamine solution and polydopamine (PDA)–BF was successfully prepared. Then thermoplastic polyurethane (TPU)/GF composites and TPU/PDA–GF composites were prepared by meltblending method,respectively. The effects of GF content as well as dopamine solution concentration on the mechanical properties of the composites and the interaction between fiber and TPU matrix were investigated. The results showed that the tensile modulus increased with GF content increasing,while both the tensile modulus and elongation at break decreased significantly. Whereas, the tensile modulus,tensile strength and elongation at break of TPU/PDA–GF composites being prepared with dopamine solution concentration of 0.50 g/L was 79.12,34.56 MPa and 495.77%,which was increased by 24.54%,45.52% and 27.76 % than those of TPU/GF composites,respectively. Moreover,the tensile modulus of TPU/PDA–GF composites was 71.52 % higher than that of TPU,and the tensile strength and elongation at break were similar to those of TPU. Dynamic rheological test results showed that the loss modulus,complex viscosity and loss tangent of TPU/PDA–GF composites at low frequency were higher than those of TPU and TPU/GF composites,which indicated that there was a strong interaction between modified fiber and polyurethane matrix,being also confirmed by scanning electron microscope results. Besides,storage modulus of TPU/PDA–GF composites at low frequency was the lowest,combined with the result of Han curves,the conclusion could be draw that there was a network structure inside TPU /PDA–GF composites that maintained a homogeneous state under test conditions. And the Cole-Cole curves analysis of composite above also confirmed it.
作者
贺茂勇
李振中
王玉龙
张保卫
He Maoyong;Li Zhenzhong;Wang Yulong;Zhang Baowei(Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2019年第10期106-111,116,共7页
Engineering Plastics Application
基金
山西省“1331工程”重点学科建设计划项目
