| Graphene oxide(GO) and Ti O2-Graphene was prepared by hydrothermal synthesis method, alcohol thermal reduction, respectively. The in-situ preparation of TPU/Ti O2 was prepared by one step synthesis; and the melt blending preparation of TPU/APP/Ti O2, TPU/Ti O2-Graphene, and TPU/APP/Ti O2-Graphene, respectively. The mechanical properties of the material and flame retardant performance were studied. The main conclusions are shown in the following:(1) The mechanical and retardant flame properties of TPU/Ti O2 from in-situ preparation method. The SEM and TEM results showed that Ti O2 has high dispersibility and anatase phase with nanometer scale. The DMA and tensile test showed that Ti O2 increased the rigidity and toughness of TPU, when the filler content is 0.5wt%, the elongation at break of materials is up to 912%. The TGA test results show that residual mass is 11.84 wt% of TPU/Ti O2 at 500 oC; when the Ti O2 content is 0.125, 0.25, 0.5, 1wt%, the residual mass is increased by 21.8, 21.8, 49.8, 175%, respectively. As a result, Ti O2 can improve the thermal stability of TPU. The CCT results show that when Ti O2 content is 1wt%, compared with pure TPU, the p HRR, THR, p SPR, SF of TPU/Ti O2 was reduced by 68%, 20%, 42% and 20%, respectively.(2) Synergistic flame retardant effect and mechanical properties of TPU/APP/Ti O2 materials. The SEM results showed that nano Ti O2 made the TPU/APP section smooth and much uniform. The DMA results showed that TPU/APP/Ti O2 have larger rigidity and toughness with the filler content increasing. The tensile results showed that elongation at break of TPU/APP/Ti O2 was 186% with 0.125wt% Ti O2. And the tensile length also increase with the increase of Ti O2 content, the elongation at break of TPU/APP/Ti O2 was 383% with 0.5wt% content of Ti O2. The TG results showed that TPU/APP/Ti O2 with 0.5wt% Ti O2 has 40 wt% residual mass, which is much more than that of TPU/APP with 14.3% at 500 oC. So, it can be concluded Ti O2 can improve the thermal stability of TPU/APP. The CCT results showed that p HRR, THR, p SPR and SF of TPU/APP with 20% content APP dropped by 86%, 35%, 71% and 35%, respectively than TPU-0. The p SPR, SF value of TPU/APP/Ti O2 with 1wt% Ti O2 content fell by 35% and 42% than TPU/APP.(3). The preparation, flame retardant effect and mechanical properties of TPU/Ti O2-Graphene nanocomposite. The XRD, IR, SEM and TEM results show that TPU/Ti O2-Graphene has high dispersion and globular nanometer Ti O2 particles. The CCT results showed that p HRR, p SPR and SF values reduced by 40, 50 and 45%, respectively, compared with pure TPU with 1wt% Ti O2-Graphene. The TG results showed that the residual mass of TPU/Ti O2-Graphene mass were 13, 15, 9.5 and 13 wt%, respectively. TPU/Ti O2-Graphene composite material can obtain high thermal stability. The DMA and tensile results showed that Ti O2-Graphene can increase the rigidity and toughness of TPU materials.(4). Flame retardant and mechanical properties of TPU/APP/Ti O2-Graphene composites. The SEM and TEM results showed that TPU/APP/Ti O2-Graphene has less holes’ quantity and smaller diameter in section structure, and smooth surface after Ti O2-Graphene. The CCT results showed that p HRR, SF, TSR values of TPU/APP has fallen by 90%, 92% and 10%, respectively. However, p HRR, SF and TSR values of TPU/APP/Ti O2-Graphene with 1wt% Ti O2-Graphene has reduced by 22%, 56% and 43%, respectively, than TPU/APP. The TG results showed that the thermal degradation rate of TPU/APP/Ti O2-Graphene with 0.125wt% Ti O2-Graphene is slower than that of TPU/APP, showing that Ti O2-Graphene has played a very good thermal stability in TPU/APP system. And the thermal stability increased with increase of Ti O2-Graphene content. The residual mass of TPU/APP/Ti O2-Graphene containing 1% Ti O2-Graphene is 33 wt%, which is more than that of TPU/APP with 12 wt%. The tensile test results showed that Ti O2-Graphene can increase viscosity and tensile strength of TPU/APP. |
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