Preparation And Characterization Of PBA-PMMA Core Shell Latex Particles With Functionalization Surface

In this paper, PBA-P （MMA-GMA）、 PBA-P （MMA-HPMA） and PBA-P（MMA-DMA）core shell latex particles with functional surface were synthesized by themethod of pre-emulsion semi-continuous seeded emulsion polymerization. The structure andmorphology of the latex particles were characterized by the way of Laser Particle SizeAnalyzer, Non-aqueous acid-base titration, Fourier Transform Infrared Spectroscopy (FTIR),Differential Scanning Calorimeter (DSC) and Transmission Electron Microscope (TEM).The results of the experiments showed that PBA core latex particles was synthesized bythe method of pre-emulsion semi-continuous seeded emulsion polymerization. The averagesize of PBA core latex particles was270nm. Anionic emulsifier SDS and non-ionic emulsifierOP-10were used and composite ratio was1:1, the dosage of composite emulsifier was0.7%of core monomer. When polymerization temperature was85℃, reaction time was150minafter dropping, and initiator dosage was0.5%of core monomer, BA conversion was thehighest and reached to96.01%, the stability of polymerization system and storage stability ofemulsion were higher in this time. The dosage of Crosslinking agent DVB was4.5%of coremonomer.Taken the ALMA as grafting agent, the chemical connection in core-shell interface wasrealized by introducing grafting agent in the second half process of polymerization reaction,and the effect of grating agent dosage on conversion of core monomer、size of PBA core latexparticlesand gel content were discussed. The results of the analysis showed that grafting agentdosage was3%of core monomer, the storage stability of emulsion were higher,polymerization system was stable, conversion of core monomer was the highest, and size ofPBA core latex particle distributed in between200～300nm.PBA-PMMA core shell latex particles with core shell mass ratio of60/40、70/30and80/20were synthesized, respectively. The results of the analysis showed that PMMA shellcoated on PBA core latex particles successful, and the chemical connection existed incore-shell interface. PBA-PMMA latex particles showed integral core-shell structure.Taken the GMA、HPMA and DMA as functional monomer, PBA-P（MMA-GMA）、PBA-P（MMA-HPMA）and PBA-P（MMA-DMA）core shell latex particles were synthesized,respectively. The average size of PBA core latex particles and three kinds of core shell latexparticles was270nm and340nm, respectively. The results of the analysis showed that thefunctional monomer really participated in copolymerization, one part of shell copolymerinarched on PBA core by chemical bond. Tg values of shell copolymer was increased by introducing the functional monomer. PBA-PMMA latex particles with functional surfaceshowed integral core-shell structure. PBA-PMMA core shell latex particles with functionalsurface should possess toughening function and compatibility simultaneously, PBA-PMMAcore shell latex particles with functional surface provided the newer and simpler way oftoughening brittle plastics (such as:PA6), which had a favourable application foreground.