通过添加稀土β成核剂和过氧化物获得β-PPR和高熔体流动速率β-PPR。运用差示扫描量热仪（DSC）和X射线衍射仪（XRD）研究了熔体流动速率对结晶性能的影响。结果表明,过氧化物的加入使β-PPR中β晶含量降低。将无规共聚聚丙烯（PPR）、β-PPR和高熔体流动速率β-PPR分别在80℃~120℃热处理1 h,随热处理温度升高,PPR的结晶度持续升高,而β-PPR和含过氧化物的β-PPR结晶度呈现先升高后降低的趋势。在研究温度范围内,随热处理温度升高,各样品中β晶含量降低。
β-form propylene-ethylene random copolymer（PPR） and high melt flow rate（MFR）β-PPR were pre- pared by the addition of rare earthβnucleating agent and peroxide into PPR.Effect of MFR on crystallization proper- ties ofβ-PPR was studied by means of differential scanning calorimetry（DSC） and X-ray diffraction（XRD）.It was found that the introduction of peroxide decreased the content ofβcrystal.PPR,β-PPR and high MFRβ-PPR were annealed at 80℃to 120℃for 1 h.The results show that with the increase of annealing temperature,the crystallin-i ty of pure PPR increases,while the crystallinity ofβ-PPR and high MFRβ-PPR increase first and then decrease.The content ofβcrystal decreases with annealing temperature.
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