Preparation And Applied Rheological Properties Research Of SBS/PBMA LIPNs For PVC Materials

Latex interpenetrating polymer network (LIPNs) is a polymer composed by interpenetratingnetwork of two or more cross-linking. By cross-linking throughout, there is a synergy between theaction phase, resulting in a "forced mutual capacitance" effect. It has a physical blend of polymershave the excellent performance; it is widely used in experimental research and productionapplications. This selection of butyl methacrylate (BMA) and styrene-butadiene-styrene triblockcopolymer (SBS), it is two common monomers for IPNs emulsion polymerization.In this study, the research group was prepared by ATRP in the legal basis of SBS/PBMAIPNs and on the mechanical properties of PVC research. Using the green emuls ion polymerization,by adjusting the amount of crosslinking agent, the nano-particles made of flexible latex particlestransition to rigid particles and explore these different gel content of SBS/PBMA LIPNsinterpenetrating network after nano-latex particles and PVC matrix physical blending, affect therheological properties and processing performance.The results showed that:Firstly, the principle of emulsion polymerization kinetics were investigated emuls ifier,initiator of different dosage and crosslinking agent, the establishment of solid content-time andconversion rate-time. Morphology and structure of the polymer were laser particle analys is (LPA),transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and fouriertransform infrared (FT-IR) characterization of differential. The results showed that: when theemulsifier, initiator and crosslinking agent1.5%,0.5wt%and15%, respectively. A narrowparticle size distribution can be obtained, and the particle diameter between65-70nm innanometer latex particles.Secondly, by varying the amount of crosslinking agent, the gel content of the preparation ofdifferent nano-latex interpenetrating network particles, increasing the glass transition temperatureof the polymer, increasing the rigidity of the latex particles, latex particles so that the particlestransition from elastic to rigid particles. Different morphology gel content of latex particles andnano-structure of this series spectrometry, nano-particles were100nm monodisperse latex particlesize distribution.Finally, a number of different levels of nano-latex particles were prepared, in differentproportions with PVC physical blending, examine its impact on the rheological and mechanicalproperties of PVC resin. Torque rheometer test results show ed that with increasing SBS/PBMALIPNs amount, the plasticizing time significantly reduced, but the torque balance and equilibriumtemperature changed a little. Meanwhile, the effects of different gel content was added1phr ofSBS/PBMA LIPNs at the same temperature, the rotational speed was to obtain a balancedrelationship between the speed and torque. Ostwald model was used linear equation fittingrelationship shear rate and apparent viscosity of non-Newtonian fluids meet shear thinningphenomenon, and the gel content of the latex particles with the improvement, the phenomenon ismore pronounced pseudoplastic fluid. And through relationships with the apparent viscosity of theArrhenius equation to calculate the viscous flow activation energy, nano-latex particles withimproved rigidity, viscous flow activation energy increases. Further, its workability was alsostudied, the results showed that with increasing of SBS/PBMA LIPNs amount, the mechanical properties decreased. Meanwhile, added1phr to8wt%crosslinking agent of SBS/PBMA LIPNsPVC material toughness and strength has increased, indicating that SBS/PBMA LIPNs additionand modest degree of crosslinking under a certain toughening enhanced role, and its crosssectional transmission electron microscopy were consistent with the mechanics phenomenaresults.