Synthesis Of Montmorillonite Modified Acrylic Modifiers And Toughening Poly(Vinyl Chloride)

A series of AIM/montmorillonite clay nanocomposite materials modifiers have been successfully prepared by in situ emulsion polymerization in the presence of inorganic nanolayers of hydrophilic Na-MMT clay with SDS and KPS as surfactant and initiator, respectively. These mAIM particles had a significant core-shell structure, which the poly (butyl acrylate) rubber phase as core with grafted poly (methyl methacrylate) as shell.XRD analysis reveals that the interlayer distance of MMT has a0.24nm increasing because of the polymerization of butyl acrylate monomer. The result of particle size analyzer shows that the mAIM particle size is about11Onm and the particle size distribution reached to about simplification separation. The mAIM particles, with0.2～2wt%MMT compared to monomer, were dispersed in rigid poly (vinyl chloride) by melt compounding method and the properties was studied. The mechanical properties of the PVC/mAIM blends have greatly improved compared to pure PVC. When the ratio of the core and shell is80:20and the MMT content is0.2wt%, the impact strength would keep on increasing with the adding of mAIM content, and the toughening crisp change point is10phr mAIM. However, the tensile strength and the Young’s modulus are slightly decreasing. With the increasing of MMT content in mAIM, the compact strength of PVC/mAIM blends is decreasing. The materials performed from ductile fracture to brittle fracture at0.8wt%MMT content. However, the tensile strength and Young modulus of the blends are increasing with the adding of MMT content. The result also shows that the impact strength of PVC/mAIM composites is increasing with the increasing of the core and shell ratio, when adding the same content of MMT.The result of DMA shows that the storage modulus of mAIM is increasing when increasing the MMT conten. For example, the composite which the MMT content is2wt%has the maximum storage modulus at the whole temperature. The result of TGA showed that the Tonset of mAIM is larger than that of AIM. Besides, the Tonset of mAIM with0.4wt%can reach to364.69℃, which is the largest.