热氧老化对PA10T/GF复合材料性能及使用寿命的影响
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摘要
用玻璃纤维(GF)对聚对苯二甲酰葵二胺(PA10T)进行改性得到PA10T/GF复合材料,通过控制熔融共混过程中GF的长度制备短GF增强PA10T(PA10T/SGF)复合材料和长GF增强PA10T(PA10T/LGF)复合材料。采用人工加速老化实验,研究热氧老化对PA10T/GF复合材料力学性能的影响,通过扫描电子显微镜(SEM)对PA10T/GF复合材料的冲击断面以及表面形貌进行分析,并预测了PA10T/GF复合材料的使用寿命。结果表明,PA10T/LGF复合材料的拉伸、弯曲强度以及缺口冲击强度较PA10T/SGF复合材料的高;在240℃下热氧老化50 d后,与PA10T/LGF复合材料相比,PA10T/SGF复合材料具有更好的耐老化性能;SEM分析表明,PA10T/GF复合材料的热氧老化机理主要是由于PA10T树脂的降解所引起的PA10T与GF界面作用的削弱;而通过寿命预测发现当使用温度为150℃时,PA10T/LGF和PA10T/SGF复合材料的使用寿命分别为101 d和86 d,在温度低于172℃时,PA10T/LGF复合材料比PA10T/SGF复合材料具有更长的使用寿命。
Poly(decamethylene terephthalamide)(PA10T) was modified with glass fiber(GF) to obtain PA10T/GF composites. By controlling the length of GF in the melt blending process,short GF reinforced PA10T(PA10T/SGF) composite and long GF reinforced PA10T(PA10T/LGF) composite were obtained. The effects of thermal-oxidative aging on the mechanical properties of the PA10T/GF composites were studied by means of artificial accelerated aging experiment. The impact cross-section and surface morphology of the PA10T/GF composites were studied by scanning electron microscopy(SEM). At the same time,the service lifes of the PA10T/GF composites were predicted. The results show that the tensile strength,flexural strength and notched impact strength of PA10T/LGF composite are better than those of PA10T/SGF composite. After 50 d thermal-oxidative aging process at 240℃,compared with PA10T/LGF composite,PA10T/SGF composite has better aging resistance. SEM analysis indicates that the thermal-oxidative aging mechanism of the PA10T/GF composites is mainly attributed to the weakening of the interfacial interaction between PA10T and GF caused by the degradation of PA10T resin. The service life expectancy of the PA10T/GF composites illustrates that,when the service temperature is 150℃,the service life of PA10T/LGF and PA10T/SGF composite is 101 d and 86 d respectively. PA10T/LGF composite has longer service life than PA10T/SGF composite when the service temperature is lower than 172℃.
Poly(decamethylene terephthalamide)(PA10T) was modified with glass fiber(GF) to obtain PA10T/GF composites. By controlling the length of GF in the melt blending process,short GF reinforced PA10T(PA10T/SGF) composite and long GF reinforced PA10T(PA10T/LGF) composite were obtained. The effects of thermal-oxidative aging on the mechanical properties of the PA10T/GF composites were studied by means of artificial accelerated aging experiment. The impact cross-section and surface morphology of the PA10T/GF composites were studied by scanning electron microscopy(SEM). At the same time,the service lifes of the PA10T/GF composites were predicted. The results show that the tensile strength,flexural strength and notched impact strength of PA10T/LGF composite are better than those of PA10T/SGF composite. After 50 d thermal-oxidative aging process at 240℃,compared with PA10T/LGF composite,PA10T/SGF composite has better aging resistance. SEM analysis indicates that the thermal-oxidative aging mechanism of the PA10T/GF composites is mainly attributed to the weakening of the interfacial interaction between PA10T and GF caused by the degradation of PA10T resin. The service life expectancy of the PA10T/GF composites illustrates that,when the service temperature is 150℃,the service life of PA10T/LGF and PA10T/SGF composite is 101 d and 86 d respectively. PA10T/LGF composite has longer service life than PA10T/SGF composite when the service temperature is lower than 172℃.
引文
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[2]Huang C H,Chen F,Guo Z X,et al.Preparation of polyamide6/polystyrene quasi-nanoblends by diffusion and subsequent polymerization of styrene in water-sorbed polyamide 6 pellets[J].Journal of Applied Polymer Science,2017,134(10).doi:10.1002/app.44554.
[3]Bassett A W,La Scala J J,Stanzione J F,et al.Richard P.Wool’s contributions to sustainable polymers from 2000 to 2015[J].Journal of Applied Polymer Science,2016,133(45).doi:10.1002/app.43801.
[4]Marchildon K.Polyamides-still strong after seventy years[J].Macromolecular Reaction Engineering,2011,5(1):22-54.
[5]Gul O,Yilmaz S,Yilmaz T.Effect of CBC and G-POSS on tribological behaviour of polyamide 6 and short glass fiber reinforced polyamide 6 composites[J].Acta Physica Polonica,2015,127(4):1 121-1 123.
[6]Abbasi Moud A,Javadi A,Nazockdast H,et al.Effect of dispersion and selective localization of carbon nanotubes on rheology and electrical conductivity of polyamide 6(PA6),polypropylene(PP),and PA6/PP nanocomposites[J].Journal of Polymer Science Part B:Polymer Physics,2015,53(5):368-378.
[7]Corrêa A C,de Morais Teixeira E,Carmona V B,et al.Obtaining nanocomposites of polyamide 6 and cellulose whiskers via extrusion and injection molding[J].Cellulose 2013,21(1):311-322.
[8]Song H,Zhou D,Guo J.Thermal-oxidative aging effects on the properties of long glass fiber reinforced polyamide 10Tcomposites[J].Polymer Composites,2016.doi:10.1002/pc.24174.
[9]曲振,胡国胜,王建霞,等.耐高温尼龙PA10T的合成与表征[J].化工新型材料,2014,42(1):137-139.Qu Zhen,Hu Guosheng,Wang Jianxia,et al.Synthesis and characterization of PA10T with heat resistance[J].New Chemical Materials,2014,42(1):137-139.
[10]孙学科,高红军,麦堪成,等.基于PA10T的生物基耐高温聚酰胺的合成[J].工程塑料应用,2017,45(2):1-5.Sun Xueke,Gao Hongjun,Mai Kancheng,et al.Synthesis of biobased heat-resistant polyamides based on PA10T[J].Engineering Plastics Application,2017,45(2):1-5.
[11]Unterweger C,Brueggemann O,Fuerst C.Synthetic fibers and thermoplastic short-fiber-reinforced polymers:Properties and characterization[J].Polymer Composite,2014,35(2):227-236.
[12]Cerruti P,Carfagna C.Thermal-oxidative degradation of polyamide 6,6 containing metal salts[J].Polymer Degradation and Stability,2010,95(12):2 405-2 412.
[13]Chow W S,Abu Bakar A,Mohd Ishak Z A.Water absorption and hygrothermal aging study on organomontmorillonite reinforced polyamide 6/polypropylene nanocomposites[J].Journal of Applied Polymer Science,2005,98(2):780-790.
[14]刘璐璐,宣海军,洪伟荣,等.锻纹机织复合材料高速冲击试验研究及理论分析[J].中国科技论文,2016,11(10):1 169-1 174.Liu Lulu,Xuan Haijun,Hong Weirong,et al.Experimental study and theoretical analysis on high velocity impact of stain woven carbon fiber reinforced composites[J].China Seciencepaper,2016,11(10):1 169-1 174.
[15]张伟,吕胜利,吕毅,等.二维编织C/Si C复合材料高温拉伸性能研究[J].强度与环境,2009,36(1):22-26.Zhang Wei,Lyu Shengli,Lyu Yi,et al.Research of tensile p e r f o r m a n c e o f 2 D w e a v e C/S i C c o m p o s i t e s a t h i g h temperature[J].Structure&Environment Engineering,2009,36(1):22-26.
[16]Zuo X,Zhang K,Lei Y,et al.Influence of thermooxidative aging on the static and dynamic mechanical properties of long-glassfiber-reinforced polyamide 6 composites[J].Journal of Applied Polymer Science,2014,131(3):1 023-1 031.
[17]于广益,李小慧,金石磊,等.GMT-PP材料老化性能及寿命预测研究[J].广州化工,2016,11(10):96-98.Yu Guangyi,Li Xiaohui,Jin Shilei,et al.Study on aging performance and life prediction of GMT-PP materials[J].Guangzhou Chemical Industry,2016,11(10):96-98.
[18]韩勤会,王珊,刘子海,等.动态力学法研究热氧老化对含钆有机玻璃性能的影响[J].稀有金属,2015,39(6):522-526.Han Qinhui,Wang Shan,Liu Zihai,et al.Dynamic mechanical analysis of properties of Gd3+-containing organic glass[J].Chinese Journal of Rare Metals,2015,39(6):522-526.
[19]高立花,叶林.尼龙6湿热老化寿命预测[J].高分子材料科学与工程,2015,31(5):111-114.Gao Lihua,Ye Lin.Service life prediction of nylon 6 under h y d r o t h e r m a l a g e i n g[J].P o l y m e r M a t e r i a l s S c i e n c e a n d Engineering,2015,31(5):111-114.
[20]茆诗松.加速寿命试验的加速模型[J].质量与可靠性,2003(2):15-17.Mao Shisong.The accelerating mode of accelerated life test[J].Quality and Reliability,2003(2):15-17.
[21]高炜斌,马立波,刘日鑫.Arrhenius方程外推法预测聚碳酸酯的贮存寿命[J].塑料,2010,39(1):120-121.Gao Weibin,Ma Libo,Liu Rixin.Arrhenius equation extrapolation predicting the storage life of polycarbonate[J].China Plastics,2010,39(1):120-121.