Preparation And Properties Of Halogen-free Flame Retardant PBAT Composites And Electrospinning Films

With the strengthening of the country’s environmental protection efforts,the use of some traditional plastic products has been restricted.Poly(butylene adipate-coterephthalate)(PBAT)was widely used due to its biodegradability,better toughness and ductility in the case of extremely strict plastic restrictions,which is a promising biodegradable product.However,the lack of research on the material itself and the defects of low limiting oxygen index,flammability and high price,which limit the further development of PBAT in the application field.Therefore,in this paper,the flame-retardant modified PBAT/FR/MP and PBAT/PBS/FR/MP composites were prepared by melt blending.The effects of adding flame retardants and compatibilizers(MP)on the flame retardant properties,mechanical properties and thermal properties of the composites were discussed.In order to broaden the application field of PBAT,the flame-retardant modified PBAT@MXene nanofiber films were prepared based on electrospinning method.The processing conditions of electrospinning PBAT were explored,and the characteristics of the nanofiber films under the conditions were characterized and analyzed in terms of morphology,structure,tensile properties,flame retardant properties,and crystallization properties.The main research conclusions of this paper are as follows:(1)Preparation and properties of PBAT/FR/MP composites.Modified PBAT materials with different contents of flame retardants were prepared by melt blending.When the addition amount of flame retardant was 12%,the limiting oxygen index of modified PBAT is 29.5%,the vertical combustion level reaches V0,and the droplet phenomenon during the combustion process is improved.The thermal stability of flame retardant modified PBAT is significantly improved.After adding 7% compatibilizer,the dispersion degree of flame retardant in the matrix is improved.Compared with the composite material without compatibilizer,the tensile strength is increased by 20.8%,and the mechanical properties are improved.(2)Preparation and properties of PBAT/PBS/FR/MP composites.The flame retardant modified PBAT/PBS/FR/MP composites were prepared by melt blending method.When the additive amount of flame retardant was 9%,the limiting oxygen index of PBAT/PBS/FR/MP is 28.6%,and the vertical combustion grade reaches V0.After adding PBS,the Young’s modulus of the composites increased by 42.6%,and the crystallinity and crystal size increased too.The loss modulus and storage modulus of the composites increased after the addition of PBS,and the processability is improved.The mechanical properties of the composites are better when the PBS content was 25%.Compared with the flame retardant modified composite without compatibilizer,the tensile strength and elongation at break increased by 41.1% and 36.6%,respectively.(3)The application of flame retardant modification on PBAT electrospinning membrane was investigated.PBAT/FR nanofiber films were prepared by electrospinning technology,then PBAT/FR@MXene nanofilms were prepared by adsorbing MXene.Different solvents were used to prepare electrospinning solution,the results showed that the nanofiber membrane prepared by chloroform/DMF mixed solvent has better structure,morphology and mechanical properties than single solvent.Moreover,the PBAT/FR nanofiber membrane has good hydrophobicity,and the antidroplet property of the nanofiber films after loading MXene is enhanced,which plays an obvious flame retardant effect.After loading MXene,the tensile strength is increased by 2 times,the modulus is significantly improved,and the mechanical properties also improved due to the improvement of the adhesion between fibers.