为解决纳米粒子在聚四氟乙烯（PTFE）树脂中难分散均匀的问题,使用PTFE乳液通过原位溶胶-凝胶法（Sol-Gel）制备了聚四氟乙烯/二氧化硅（SiO2）杂化材料,并对其性能进行了表征与研究.研究表明：杂化材料的拉伸强度在SiO2含量为1.05%（记为FS-2）时达到最大值20.96 MPa,为纯PTFE的两倍;断裂伸长率随着SiO2含量的增加而降低,硬度逐渐升高,接触角由121°降至79°.由SEM结果发现,试样FS-2中SiO2的粒径仅为100 nm左右,但随着SiO2含量的增加,粒径变大.杂化材料的耐热性较PTFE有一定提高,当杂化材料中SiO2含量达到5.00%时,热分解温度由纯PTFE的503℃上升至528℃.
Based on the hard dispersion of nanoparticles in PTFE (polytetrafluoroethylene) resin, PTFE/SiO2 hybrids were prepared by PTFE emulsion in-site Sol-Gel process, and the performance of hybrids was de- scribed. When the content of SiO2 was 1.05 % ( marked as FS-2 ) , the tensile strength reached a maximum 20.96 MPa, which was twice as much as that of the blank PTFE. With the improvement of SiO2 content, the e- longation at break were reduced ,the hardness increased gradually,and the contact angle decreased from 121° to 79°. The SEM images showed that the diameter of SiO2 in FS-2 was 100 nm,and became larger as the in- creasing of SiO2 content. The heat resistance of hybrids were enhanced when SiO2 content reached 5.00% , and its decomposition temperature was 528℃, while that of blank PTFE was 503℃.
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