Preparation And Properties Research Of Polybutene-1 Composites

Polybutene-1?PB-1?is wildly used as pipe and film because of its excellent mechanical properties,great creep resistant even at high temparature,good machinable and filling property.In recent years,with the improvement of polybutene-1polymerization process in China,increasing number of polybutene-1 materials will come into our life.So that,it is of great significance to study and develop polybutene-1 composites to meet the requirement of people in more fields.Filling modification method is wildly used in the fileds of the polymer modification.In this research,the PB-1/modified graphene oxide?MGO?composite,PB-1/titanium deoxide?Ti O₂?composite and PB-1/modified GO-Ti O₂?MGO-Ti O₂?composite were preparaed by solution blending method,the structure of these composites were studied by fourier transform infrared spectroscopy?FTIR?,scanning electron microscope?SEM?and X ray diffraction?XRD?,melting and crystalline properties were researched by differential scanning calorimeter?DSC?,and tensile properties and flexural properties were tested by universal material testing machine.The main research contents were as follows:?1?The graphene oxide?GO?with small thickness and uniform particle size was synthesized by optimization reaction time in the medium reaction stage of Hummers method and ultrasonic processing time,respectively.Then,the KH570 was applied to modify the surface of GO,and the modification conditions were optimized.The best modification condition were as follows:the mass ratio of KH570 to graphene oxide was 3.5,the temperature was 50^oC,the modification time was 25 h,and the modification p H was 6.Based on these conditions,the graft ratio of KH570 on graphene oxide was 31.7%.?2?The PB-1/MGO composite was preparaed by solution blending methods.SEM results showed that the modified GO exhibited a good compatibility with PB-1,however,when the amount of MGO exceed to 1wt%,it showed a little agglomerate in PB-1.The results of XRD showed that the addition of MGO did not change the crystalline form of PB-1,and there was no characteristic peak of graphene oxide in XRD spectrum,it meant that MGO was exfoliated in the PB-1 matrix.Then the melting and crystalline behavior of PB-1/MGO were studied,the results showed that melting temperature rised with the increase of the amount of MGO,when the dosage of MGO was 0.75wt%,the melting temperature and crystallization temperature were increased by 4.5^oC and 1.5^oC,when the amount of MGO was more than 0.75wt%,melting and crystallization temperature began to decrease.The results of non-isothermal crystallization kinetics showed that when the amount of graphene oxide was between0.25wt%and 0.75wt%,it showed a significant nucleation function and accelerated the crystallization of PB-1.When the content exceeded to 0.75wt%,the function of heterogenous nucleation of MGO was reduced,and the crystallinity of the material was decreased.When the content of MGO was 0.75wt%,the tensile strength and flexure strength of the composite reached its maximum.?3?The PB-1/Ti O₂ composite was preparaed by solution blending methods.The addition of Ti O₂ made the melting and crystallization temperature of the PB-1/Ti O₂composite increase.When the amount of Ti O₂ was 1wt%,the melting and crystallization temperature were increased by 5.36^oC and 3.9^oC,respectively,and the crystallinity of the composite was also increased.The results of non-isothermal crystallization kinetics of PB-1/Ti O₂ composite showed that when the amount of Ti O₂was 0.25-1wt%,the heterogeneous nucleation effect of Ti O₂ was significant,and the crystallinity of the composite was promoted.When the dosage exceed to 1wt%,the effect of heterogenous nucleation was reduced,and the crystallinity of the composite was decreased.The results of mechanical properties showed that the tensile strength and flexure strength of the PB-1/Ti O₂ composite were increased when the amount of Ti O₂ was 0.25-1wt%,but the elongation at break was decreased.When the amount of Ti O₂ was 2wt%,the tensile strength and flexure strength were decreased.?4?GO-Ti O₂ composite was prepared according to the method from a literature.The results of XRD showed that GO-Ti O₂ was in agreement with the results of the literature.After that,the GO-Ti O₂ composite was modified by KH570,and the modification conditions were optimized.The best modification conditions were as follows:the modification p H was 6.5,the modification time was 25 h,the modification temperature was 55^oC,and the mass ratio of KH570 to GO-Ti O₂ was 3.24.Based on these conditions,the graft ratio of KH570 on graphene oxide was 14.1%.The melting and crystallization temperature of PB-1/MGO-Ti O₂ were decreased compared with the pure PB-1.When the amount of MGO-Ti O₂ was 0.25wt%,there was less KH570 in a small amount of MGO-Ti O₂,and the cohesion force between PB-1 and MGO-Ti O₂ was not strong,which caused the decrease of compatibility between MGO-Ti O₂ and PB-1.The other hand,the lamellar structure of MGO-Ti O₂ hindered the orderly arrangement of segments in the crystallization process,with the increase of the amount of MGO-Ti O₂,the crystallization and melting temperature were closed to raw materials,because there were more KH570 content in a large amount of MGO-Ti O₂,which increased the compatibility between MGO-Ti O₂ and PB-1,so the crystallization of PB-1 was promoted.The results of mechanical properties showed that the tensile strength and flexure strength of the PB-1/MGO-Ti O₂ composite were decreased compared with pure PB-1.