PREPARATION AND CHARACTERIZATION OF SPHERICAL PP/PB ALLOYS WITH MgCl_2-SUPPORTED ZIEGLER-NATTA CATAL

来源 :Chinese Journal of Polymer Science | 被引量 : 0次 | 上传用户:wanghao521146
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Polypropylene(PP)/polybutene-1(PB) alloys within reactor were prepared by MgCl_2-supported Ziegler-Natta catalyst with sequential two-stage polymerization technology.First,propylene homo-polymerizations were carried out to form isotactic polypropylene(iPP) particles containing active catalyst.Then,butene-1 was subsequently polymerized to form polybutene-1 phase inside the iPP particles.Finally,iPP/PB alloys with spherical shape and adjustable PB content were synthesized.The catalytic activity and catalytic stereospecificity of the Z-N catalyst in the two-stage polymerization process are discussed.The composition and physical properties of the PP alloys were characterized by FT-IR,~(13)C-NMR,SEM,DSC and XRD.It was found that the in-reactor PP alloys are mainly composed of PP and PB with a little amount of poly(butene-co -propylene) random copolymers and poly(butene-block-propylene) block copolymers.SEM measurements verified that the PB phases with size in the range of 300-400 nm dispersed in the PP matrix uniformly.The incorporation of PB upon the PP matrix affects the properties of final products greatly. Polypropylene (PP) / polybutene-1 (PB) alloys within reactor were prepared by MgCl_2-supported Ziegler-Natta catalyst with sequential two-stage polymerization technology. First, propylene homo- polymerizations were carried out to form isotactic polypropylene active catalyst.Then, butene-1 was followed polymerized to form polybutene-1 phase inside the iPP particles. Finally, iPP / PB alloys with spherical shape and adjustable PB content were synthesized. catalytic activity and catalytic stereospecificity of the ZN catalyst in the Two-stage polymerization process are discussed.The composition and physical properties of the PP alloys were characterized by FT-IR, ~ (13) C-NMR, SEM, DSC and XRD.It was found that the in-reactor PP alloys are mainly composed of PP and PB with a small amount of poly (butene-co -propylene) random copolymers and poly (butene-block-propylene) block copolymers. SEM observations verified that the PB phases with size in the range of 300-400 nm dispersions ed in the PP matrix uniformly. The incorporation of PB upon the PP matrix affects the properties of final products greatly.
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