通过熔融共混法制备出长玻纤增强尼龙10T(LGF/PA10T)复合材料,并且采用 DSC、DMA、SEM和力学性能测试等方法研究了不同热氧老化时间对 LGF/PA10T 复合材料静、动态力学性能的影响,并对 LGF/PA10T复合材料发生玻璃化转变时所需活化能进行了计算。结果表明：虽然在老化初期 PA10T分子链之间会发生微交联,材料的刚性略有增加,但在整个老化过程中,分子链断裂、分子量下降起主导作用,在240℃下老化50 d 后,LGF/PA10T复合材料的拉伸强度保持率、弯曲强度保持率、缺口冲击强度保持率分别为4.9%、6.3%、9.4%。随着老化时间的增长,玻纤与PA10T基体之间的界面粘接作用减弱,玻璃化转变温度和阻尼性能下降。活化能计算结果表明热氧老化能够改变PA10T分子链的活动能力,降低了 LGF/PA10T复合材料的热稳定性。
Long glass fiber reinforced nylon10T(LGF/PA10T)composites were prepared by melt blending method, and the effects of different thermal-oxidative aging time on the static and dynamic mechanical properties of LGF/PA10T composites were characterized by DSC,DMA,SEM and mechanical properties test,and the activation ener-gy of glass transition of LGF/PA10T composites were calculated.The results indicate that PA10T molecular chains are a little cross-linked in the initial stage of aging,slightly increasing the rigid properties of material,but the mo-lecular chains fracture and the reduction of molecular weight play a vital role in the whole aging process.After aging at 240 ℃ for 50 d,the tensile strength retention rate,flexural strength retention rate and notch impact strength re-tention rate of LGF/PA10T composites are 4.9%,6.3% and 9.4%,respectively.With the increase of aging time, the interfacial interaction between glass fiber and PA10T matrix is weakened,both of the glass transition tempera-ture and damping capacity decrease.The calculation results of activation energy show that thermal-oxidative aging can make the mobility of PA10T molecular chain changed and reduce the thermal stability of LGF/PA10T compos-ites.
参考文献
| [1] | Colin X.;Marais C.;Verdu J..Kinetic modelling and simulation of gravimetric curves: application to the oxidation of bismaleimide and epoxy resins[J].Polymer Degradation and Stability,20023(3):545-553. |
| [2] | 易庆锋;张勇;陈健;龙杰明;曹明;姜苏俊;曾祥斌;宁凯军.耐高温聚酰胺研究进展[J].工程塑料应用,2009(11):80-82. |
| [3] | Novitsky, T.F.;Lange, C.A.;Mathias, L.J.;Osborn, S.;Ayotte, R.;Manning, S..Eutectic melting behavior of polyamide 10,T-co-6,T and 12,T-co-6,T copolyterephthalamides[J].Polymer: The International Journal for the Science and Technology of Polymers,201011(11):2417-2425. |
| [4] | Chuanhui Zhang;Xianbo Huang;Xiangbin Zeng;Min Cao;Tongmin Cai;Sujun Jiang;Qingfeng Yi.Fluidity Improvement of Semiaromatic Polyamides: Modification with Oligomers[J].Journal of Applied Polymer Science,20147(7):40058-1-40058-6. |
| [5] | J.L.Thomason.Structure-Property Relationships in Glass-Reinforced Polyamide,Part 1:The Effects of Fiber Content[J].Polymer Composites,20065(5):552-562. |
| [6] | J.L.Thomason.Structure-Property Relationships in Glass-Reinforced Polyamide,Part 3:Effects of Hydrolysis Ageing on the Dimensional Stability and Performance of Short Glass-Fiber-Reinforced Polyamide 66[J].Polymer Composites,20073(3):344-354. |
| [7] | Xiaoling Zuo;Kaizhou Zhang;Yang Lei;Shuhao Qin;Zhi Hao;Jianbing Guo.Influence of Thermooxidative Aging on the Static and Dynamic Mechanical Properties of Long-Glass-Fiber-Reinforced Polyamide 6 Composites[J].Journal of Applied Polymer Science,20143(3):39594-1-39594-10. |
| [8] | 樊威;李嘉禄.热氧老化对碳纤维织物增强聚合物基复合材料弯曲性能的影响[J].复合材料学报,2015(5):1260-1270. |
| [9] | Shu Y;Ye L;Yang T.Study on the long-term thermal-oxidative aging behavior of polyamide 6[J].Journal of Applied Polymer Science,20082(2):945-957. |
| [10] | Kebritchi, Abbas;Nekoomanesh, Mehdi;Mohammadi, Fereidoon;Khonakdar, Hossein Ali.The interrelationships between microstructure and melting, crystallization and thermal degradation behaviors of fractionated ethylene/1-butene copolymer[J].Iranian polymer journal,20154(4):267-277. |
| [11] | Ji-Huan He;Ji-Huan He;Yu-Qin Wan;Yu-Qin Wan;Jian-Yong Yu;Jian-Yong Yu.Effect of Concentration on Electrospun Polyacrylonitrile (PAN) Nanofibers[J].Fibers and Polymers,20082(2):140-142. |
| [12] | O.Becker;G.P.Simon;T.Rieckmann;Department of Process Engineering and Plant Design University of Applied Sciences Cologne D-50676 Cologne Germany;J.Forsythe;R.Rosu;S.Volker;;.Dielectric relaxation spectroscopy of reactively blended amorphous poly(ethylene terephthalate)-poly(ethylene naphthalate)films[J].Polymer: The International Journal for the Science and Technology of Polymers,20015(5):1921-1929. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%