以水性导电型石墨烯(wG)为填料,强柔韧性的水性聚氨酯(wPU)为树脂基液,通过刮涂法制备了不同wG掺量的wG/wPU电热膜。研究了wG掺量对电热膜导电性、电热性能、柔性的影响。结果表明:当wG质量掺量为6%时,电热膜综合性能最优,在施加15V、20V电压下,膜热平衡温度分别由(25±1)℃升至(45±1)℃、(61±1)℃,功耗分别为540W/m2、1100W/m2。弯曲状态下电热性能测试表明:wG-6%电热膜在实时改变弯曲程度(曲率0～100cm-1)下,仍具有优良的电热性能和工作稳定性。采用扫描电镜(SEM)、X射线衍射(XRD)和红外光谱(FT-IR)等测试分析显示wG纳米片均匀分散在wPU基体中,但与基材未产生化学反应。所制石墨烯改性柔性聚氨酯膜电热性能优异,制备过程环境友好,有望在柔性医疗、柔性穿戴等领域有较好的应用前景。
wG/wPU electrothermal films with different wG content were prepared by scraping method using water-based conductive graphene (wG) as filler and water-based flexible polyurethane (wPU) as resin base solution.The effects of wG content on the conductivity,electrothermal property and flexibility of the films were studied.The results showed that when the wG content was 6wt%,the overall performance of the film was the best.Under 15V and 20V voltage,the thermal equilibrium temperature of the film increased from (25±1)℃ to (45±1)℃ and (61±1)℃,respectively,and the power consumption was 540W/m2 and 1100W/m2,respectively.The bending test results demonstrated that the wG-6wt% electrothermal film still maintained excellent electrothermal performance and working stability when the bending degree was changed in real time (curvature 0～100cm-1).The results of SEM,XRD and FT-IR analysis indicated that the wG nanosheets were uniformly dispersed in the wPU matrix but did not react with the substrate.The resulting graphene-modified flexible polyurethane film demonstrated excellent electrothermal properties and environment-friendly preparation process,which was expected to have a good application prospect in flexible medical treatment,flexible wearing and other fields.
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基金资助
国家自然科学基金(51402030);重庆市技术创新与应用发展专项重点项目(CSTB2022TIAD-KPX0031);重庆市研究生导师团队建设项目(JDDSTD2022006)
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