OMMT对PET薄膜力学性能的影响

Effect of Organic Montmorillonite on Mechanical Properties of Optical Polyester Film

本文用双十八烷基氯化铵、双十八烷基溴化铵、咪唑、聚醚胺、咪唑啉和羧基季鏻盐等6种改性剂制备了有机蒙脱土(OMMT),并用其对聚对苯二甲酸乙二醇酯(PET)进行复合改性,探究了OMMT影响PET拉伸性能的主要因素。采用TG-DTG、SEM、DSC和XRD等方式,对OMMT和改性PET薄膜进行性能表征,实验结果表明,OMMT的有机物含量、层间距大小、片层尺寸等,对改性PET薄膜的拉伸性能均无明显影响,OMMT的热稳定性是影响改性PET薄膜拉伸性能的主要因素。其中羧基季鏻盐制备的有机MMT改性PET薄膜的拉伸性能最好,其拉伸强度为56.34 MPa,断裂伸长率为350%,比未改性的PET薄膜分别提高了3.49MPa和50%。

In this paper,six modifiers of dioctadecyl ammonium chloride,dioctadecyl ammonium bromide,imidazole,polyether amine,imidazoline and carboxy quaternary phosphonium salt were used to prepare organic montmorillonite(OMMT).The composite modification of polyethylene terephthalate(PET)with OMMT was carried out,and the main influence factors of OMMT on the tensile properties of PET were explored.TG-DTG,SEM,DSC and XRD were used to characterize the properties of OMMT and modified PET films.The experimental results showed that the organic content,interlayer spacing and sheet size of OMMT had no significant effect on the tensile properties of modified PET films.The thermal stability of OMMT was the main factor affected the tensile properties of the modified PET film.Among them,the organic MMT modified PET film prepared with carboxyl quaternary phosphonium salt had the best tensile properties.Its tensile strength was 56.34 MPa and the elongation at break was 350%,which was 3.49 MPa and 50%higher than that of the unmodified PET film.