EFFECT OF COMPOSITION ON CRYSTALLIZATION BEHAVIOR FOR POLYPROPYLENE CATALLOYS

SHANGGUAN Yonggang; XIE Yanli; ZHENG Qiang

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EFFECT OF COMPOSITION ON CRYSTALLIZATION BEHAVIOR FOR POLYPROPYLENE CATALLOYS

Research Article | 更新时间：2021-03-19

- EFFECT OF COMPOSITION ON CRYSTALLIZATION BEHAVIOR FOR POLYPROPYLENE CATALLOYS
- Acta Polymerica Sinica Issue 7, Pages: 665-671(2007)
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- Published：20 July 2007，
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SHANGGUAN Yonggang, XIE Yanli, ZHENG Qiang. EFFECT OF COMPOSITION ON CRYSTALLIZATION BEHAVIOR FOR POLYPROPYLENE CATALLOYS. [J]. Acta Polymerica Sinica (7):665-671(2007)
DOI：

SHANGGUAN Yonggang, XIE Yanli, ZHENG Qiang. EFFECT OF COMPOSITION ON CRYSTALLIZATION BEHAVIOR FOR POLYPROPYLENE CATALLOYS. [J]. Acta Polymerica Sinica (7):665-671(2007) DOI：

摘要

用示差扫描量热仪(DSC)和偏光显微镜(POM)研究了聚丙烯“催化合金”(PP-cats)组成对等温结晶行为与动力学的影响

并与等规聚丙烯(iPP)进行比较.结果表明

与纯PP相比较

PP-cats 的平衡熔融温度明显下降

表明PP-cats中作为主要组分的丙烯均聚物和乙丙无规共聚物之间存在较强的相互作用. PP-cats的结晶初期动力学可用Avrami模型很好地描述

结晶过程均为预先成核和三维生长方式. PP-cats 的结晶速率随体系中乙丙共聚物含量的增加而增大

而PP-cats 的晶体生长速率随体系中乙丙共聚物含量的增加而减小.由于PP-cats 熔体的粘度远高于纯PP

使得PP-cats 中PP 分子链运动能力降低

导致了PP-cats 较低的晶体生长速率. 此外

与纯PP 相比

PP-cats 的成核密度大幅度提高

被认为是PP-cats 具有快的结晶速率的主要原因.

Abstract

Effect of composition on crystallization behavior for polypropylene catalloys (PP-cats)was studied by using differential scanning calorimetry (DSC)and polarized optical microscopy (POM).The decrease of melting point for PP-cats indicates the existence of stronger interaction between the propylene homopolymer and the ethylene-propylene random copolymer (EPR)in PP-cats.The isothermal crystallization kinetics of PP-cats in the early stage could be described by the Avrami model

and a comparison with that of pure iPP was carried out.It is found that the crystallization of PP-cats proceeds with instantaneous nucleation and three-dimensional growth.The overall crystallization rate of PP-cats is higher than that of pure iPP and increases with the increase of the EPR content.However

the spherulite growth rate of PP-cats appears slower than that of pure iPP and decrease with the increase of the EPR content

which is ascribed to the difficulty in moving of propylene chains due to the higher viscosity of PP-cats melt.Furthermore

the results of morphology observation reveal that the nucleation density of PP-cats is rather higher than that of pure iPP.It is suggested that the higher overall crystallization rate of PP-cats is a result of the nucleation effect of the EP content.

关键词

聚丙烯“催化合金”熔点下降结晶动力学

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