网络炭纤维增强树脂基复合材料结构与性能的研究
发布时间：2018-11-25 10:03
【摘要】：短切炭纤维可通过粘结剂粘结、炭化制得炭纤维网络结构,有关粘结短切炭纤维成型材料的研究已有很多报道,包括保温材料及吸附分离材料等,但这些研究都没有把多孔的、成块的的作为增强体进一步复合制成材料,所以本文在炭纤维粘结体的基础上与树脂复合制得材料并进一步研究其性能。本实验以短切炭纤维为原料,通过预先制成炭纤维网络增强体(Carbon fiber network reinforcement,CFNR),然后浸胶环氧树脂和聚丙烯制得刚性好、热膨胀低的网络增强环氧树脂和聚丙烯的新型复合材料。利用扫描电镜和热机械分析仪对试样的微观结构和热机械性能进行表征分析。结果表明,CFNR中观察到了明显的网络节点,即炭质粘结点。网络增强环氧树脂复合材料的弯曲模量最高,是常规短切炭纤维/环氧树脂复合材料的近3倍,纯环氧树脂的6倍;高温承载时,三种试样弯曲模量因环氧树脂变软而降低:温度高于80℃时,CFNR/环氧树脂复合材料弯曲模量约是短切炭纤维/复合材料的7倍,纯环氧树脂的近70倍。此外,CFNR/环氧树脂复合材料有良好的导电性和热尺寸稳定性,其热膨胀系数(60-200℃)最小,纯环氧树脂相应的平均热膨胀系数是它的13倍,短切炭纤维/环氧树脂复合材料是它的5倍左右。网络增强环氧树脂复合材料具有最高的储能模量,短切炭纤维/环氧树脂次之,环氧树脂最小,随着温度升高,储能模量都降低,最终达到一个稳定值。短切炭纤维/环氧树脂复合材料的玻璃化转变温度最高,环氧树脂最低,网络增强环氧树脂复合材料位于两者之间。炭纤维上浆后制备的网络增强环氧树脂复合材料其弯曲模量、储能模量和玻璃化转变温度均比未上浆的炭纤维所制备的复合材料要高。通过SEM观察CFNR/聚丙烯复合材料的断面可以发现纤维粘结在一起的节点。常温时在相同载荷下,聚丙烯的行变量最大,是CFNR/聚丙烯复合材料的2.4倍,短切炭纤维/聚丙烯复合材料的形变量次之,是CFNR/聚丙烯复合材料的1.5倍。常温下CFNR/聚丙烯复合材料的弯曲模量分别约是常规短切炭纤维/聚丙烯复合材料及纯聚丙烯的1.6倍和6倍,平均热膨胀系数(60-120℃)分别是常规短切炭纤维/聚丙烯复合材料及纯聚丙烯的1/4和1/5。随着温度升高,三种材料弯曲模量降低,聚丙烯在100℃以后弯曲模量变的较小,基本上在100MPa以下。短切炭纤维/聚丙烯复合材料在100℃后弯曲模量变化不大,弯曲模量大约在200MPa,CFNR/聚丙烯材料弯曲模量绝对值远高于前两者,在400MPa以上。
[Abstract]:The network structure of carbon fibers can be obtained by binder bonding and carbonization of short cut carbon fibers. There have been many reports on bonding short cut carbon fiber forming materials, including thermal insulation materials and adsorptive separation materials, but none of these studies have made porous carbon fibers. The block is used as the reinforcer to make the material further, so the material is made from the carbon fiber binder and the resin, and its properties are further studied in this paper. In this experiment, short cut carbon fiber was used as raw material, carbon fiber network reinforcement (Carbon fiber network reinforcement,CFNR) was prepared in advance, and then impregnated with epoxy resin and polypropylene made of good rigidity. Low thermal expansion of the network reinforced epoxy resin and polypropylene new composite materials. The microstructure and thermal mechanical properties of the samples were characterized by SEM and TMA. The results show that obvious network nodes, that is, carbon bond point, are observed in CFNR. The flexural modulus of the network reinforced epoxy resin composite is the highest, which is about 3 times of that of the conventional short cut carbon fiber / epoxy resin composite and 6 times of that of the pure epoxy resin. At high temperature, the flexural modulus of the three specimens is reduced by the softening of epoxy resin. When the temperature is higher than 80 鈩，
本文编号：2355704
[Abstract]:The network structure of carbon fibers can be obtained by binder bonding and carbonization of short cut carbon fibers. There have been many reports on bonding short cut carbon fiber forming materials, including thermal insulation materials and adsorptive separation materials, but none of these studies have made porous carbon fibers. The block is used as the reinforcer to make the material further, so the material is made from the carbon fiber binder and the resin, and its properties are further studied in this paper. In this experiment, short cut carbon fiber was used as raw material, carbon fiber network reinforcement (Carbon fiber network reinforcement,CFNR) was prepared in advance, and then impregnated with epoxy resin and polypropylene made of good rigidity. Low thermal expansion of the network reinforced epoxy resin and polypropylene new composite materials. The microstructure and thermal mechanical properties of the samples were characterized by SEM and TMA. The results show that obvious network nodes, that is, carbon bond point, are observed in CFNR. The flexural modulus of the network reinforced epoxy resin composite is the highest, which is about 3 times of that of the conventional short cut carbon fiber / epoxy resin composite and 6 times of that of the pure epoxy resin. At high temperature, the flexural modulus of the three specimens is reduced by the softening of epoxy resin. When the temperature is higher than 80 鈩，
本文编号：2355704
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