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利用硅烷偶联剂(APTES)对氧化石墨烯(GO)进行功能化改性,在不同的试验条件下制备了3种硅烷偶联剂功能化GO(APTES-g-GO)纳米填料,并经熔融共混制备了APTES-g-GO填充改性的聚苯乙烯(PS)复合材料。为了改善复合材料的界面作用,采用马来酸酐接枝乙烯-辛烯共聚物(POE-g-MAH)为增容剂。分别采用FTIR、XRD、TG、SEM以及拉伸和冲击测试对填料和纳米APTES-g-GO/POE-g-MAH/PS复合材料的结构和性能进行了表征和测试。结果表明:APTES已成功接枝于GO的表面上。接枝过程中,APTES对GO有一定的剥离和还原作用。随着填料含量的增加,纳米APTES-g-GO/POE-g-MAH/PS复合材料拉伸强度和冲击强度均先上升后下降。当填料与基体质量比为0.75%时,3种复合材料的拉伸强度和冲击强度都达到最大值,其中纳米ASGO/POE-g-MAH/PS复合材料的综合性能最好,其拉伸强度和冲击强度比POE-g-MAH/PS分别提高了19%和31%。共混过程中,APTES-g-GO与POE-g-MAH之间的反应改善了纳米APTES-g-GO/POE-g-MAH/PS复合材料的界面相互作用。APTES-g-GO均匀分散于复合材料中,它的加入提高了复合材料的热稳定性能。添加ASGO填料的复合材料热稳定性能提高最为明显,含0.75%AS-GO的纳米AS-GO/POE-g-MAH/PS复合材料的最大失重温度比POE-g-MAH/PS提高了7℃。
The graphene oxide (GO) was modified by silane coupling agent (APTES). Three silane coupling agent functionalized GO (APTES-g-GO) nanofillers were prepared under different experimental conditions. APTES-g-GO filled modified polystyrene (PS) composites were prepared by melt blending. In order to improve the interfacial interaction of the composites, maleic anhydride grafted ethylene-octene copolymer (POE-g-MAH) was used as compatibilizer. The structure and properties of filler and nano-APTES-g-GO / POE-g-MAH / PS composites were characterized by FTIR, XRD, TG, SEM and tensile and impact tests. The results show that APTES has been successfully grafted onto the surface of GO. In the grafting process, APTES has a certain peel and reduction effect on GO. The tensile strength and impact strength of APTES-g-GO / POE-g-MAH / PS nanocomposites increased at first and then decreased with the increase of filler content. When the mass ratio of filler to matrix is 0.75%, the tensile strength and impact strength of the three composites reach the maximum, of which the composite performance of nano-ASGO / POE-g-MAH / PS composites is the best, the tensile strength And impact strength than POE-g-MAH / PS increased by 19% and 31%. During the blending process, the reaction between APTES-g-GO and POE-g-MAH improved the interfacial interaction of APTES-g-GO / POE-g-MAH / PS composites. APTES-g-GO is uniformly dispersed in the composite, its addition improves the thermal stability of the composite. The thermal stability of composites with ASGO filler increased most obviously. The maximum weight loss temperature of AS-GO / POE-g-MAH / PS composites with 0.75% AS-GO was 7 ℃ higher than POE-g-MAH / PS .