Structure and properties of PP/PGA composites modified by CNTs hybrids
In order to solve the problem of limited mechanical properties of polypropylene/polyglycolic acid(PP/PGA)blends due to poor compatibility,carbon nanotubes grafted polyglycidyl methacrylate hybrid particles(CNTs@PGMA)were prepared by surface-initiated graft polymerization(SIP)based on ammonium persulfate-amine redox initiation system.PP/PGA/CNTs were prepared by melt blending using CNTs@PGMA with polypropylene grafted maleic anhydride(PP-g-MAH)as the syner-gistic compatibilization system.The prepared CNTs@PGMA were characterized by infrared spectroscopy and transmission electron microscopy,the results show that PGMA is successfully grafted on the surface of CNTs by SIP method.The effects of CNTs@PGMA content on the mechanical,thermal,degradation properties,and rheological behavior of the composites were investi-gated by tensile test,differential scanning calorimetry,thermogravimetry,rotational rheology test and degradation experiment.The results show that the compatibility of the PP/PGA/PP-g-MAH system is improved by adding CNTs@PGMA.With the increase of hybrid particle content,the tensile strength of the composites first increase and then decrease,the thermal stability is improved,and the crystallization of PGA is gradually limited to no melting peak.A three-dimensional network structure is formed with the introduc-tion of hybrid particles,which improves the elasticity,non-Newtonian,and shear thinning behavior of composite melt.Meanwhile,the degradation process of PGA is also inhibited.When the content of CNTs@PGMA is 5 phr,the maximum tensile strength of the composites is 41.25 MPa,the elongation at break is 66.03%,the degradation rate of PGA at 42 days is reduced to less than 10%,and the tensile strength maintenance rate is reached 91%.
polypropylenepolyglycolic acidcarbon nanotubecompositereactive compatibilizationstructure and property
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