Preparation and properties of organic quaternary phosphonium salts modified nano-magaiite/nylon 6 composites
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摘要: 为了研究麦羟硅钠石对尼龙6(PA6)的改性作用,首先选择十六烷基三苯基溴化磷作为插层改性剂,用离子交换方法对麦羟硅钠石(Maga)进行有机化改性,制备了有机麦羟硅钠石(Org-Maga);然后利用熔融插层法制得了有机麦羟硅钠石/尼龙6复合材料(Org-Maga/PA6);采用XRD、SEM和TEM对材料的结构和微观形态进行了表征,用力学性能测试和DSC对其力学性能和结晶性能进行了研究。结果表明:插层剂十六烷基三苯基溴化磷可使麦羟硅钠石的层间距由1.53 nm增大到2.90 nm,有机麦羟硅钠石与PA6形成了插层与剥离并存的复合材料;有机麦羟硅钠石可明显提高PA6的力学性能,当有机麦羟硅钠石的质量分数为3wt%时,有机麦羟硅钠石/尼龙6复合材料的力学性能最佳;复合材料在熔融过程中出现了不稳定的γ晶型再结晶为α晶型的"熔融再结晶"现象;此外,麦羟硅钠石的加入还提高了PA6的结晶温度。Abstract: In order to investigate the modification effects of organic magadiite on nylon 6(PA6), firstly, the organic magadiite (Org-Maga) was formed from magadiite (Maga), which was intercalated by the hexadecyl triphenyl phosphonium bromide selected as the intercalation agent through ion-exchange method. Org-Maga/PA6 composites were prepared through melt intercalation method. The structure and morphologies of the materials were characterized by XRD, SEM and TEM. Mechanical properties and crystallization property of the composites were investigated by mechanical property tests and DSC. The results show that the intercalation agent can intercalate the space of the Maga, the basal spacing of the Maga is increased from 1.53 nm to 2.90 nm, and there are intercalated and exfoliated structures in nano Org-Maga/PA6 composites. The addition of Org-Maga can improve mechanical properties of PA6 obviously, which reach the optimal value when the mass fraction of Org-Maga is 3wt%. The phenomenon of "Melting recrystallization" (unstable polymer crystals (γ phases) recrystallized to form α phases) is formed during the melting process of the composite, and the crystallization temperature of PA6 will raise with the addition of magadiite.
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Key words:
- magadiite /
- nylon 6 /
- quaternary phosphonium salts /
- composites /
- mechanical property
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