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首页> 外文期刊>Journal of Applied Polymer Science >Crystallization kinetics and tensile modulus of blends of metallocene short-chain branched polyethylene with conventional polyolefins
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Crystallization kinetics and tensile modulus of blends of metallocene short-chain branched polyethylene with conventional polyolefins

机译：茂金属短链支化聚乙烯与常规聚烯烃的共混物的结晶动力学和拉伸模量

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In this study, blends of metallocene shortchain branched polyethylene (SCBPE) with low-density polyethylene (LDPE), high-density polyethylene (HDPE), polystyrene (PS), ethylene-propylene-diene monomer (EPDM), and isotactic polypropylene (iPP) were prepared in weight proportions of 80 and 20, respectively. The crystallization behaviors of these blends were studied with polarized light microscopy (PLM) and differential scanning calorimetry. PLM showed that SCBPE/LDPE, SCBPE/HDPE, and SCBPE/EPDM formed band spherulites whose band widths and sizes were both smaller than that of pure SCBPE. No spherulites were observed, but tiny crystallites were observed in the completely immiscible SCBPE/PS, and the crystallites in SCBPE/iPP became smaller; only irregular spherulites were seen. The crystallization kinetics and mechanical properties of SCBPE were greatly affected by the second polyolefin but in different way, depending on the phase behavior and the moduli of the second components. SCBPE may be phase-miscible in the melt with LDPE, HDPE, and EPDM but phase-separated during crystallization. A big change in the crystal morphology and crystallization kinetics existed in the SCBPE/iPP blend. The mechanical properties of the blends were also researched with dynamic mechanical analysis (DMA). DMA results showed that the tensile modulus of the blends had nothing to do with the phase behavior but only depended on the modulus of the second component. (c) 2005 Wiley Periodicals, Inc.
机译：在这项研究中，茂金属短链支化聚乙烯（SCBPE）与低密度聚乙烯（LDPE），高密度聚乙烯（HDPE），聚苯乙烯（PS），乙烯-丙烯-二烯单体（EPDM）和全同立构聚丙烯（iPP）的共混物）分别以80和20的重量比例制备。用偏振光显微镜（PLM）和差示扫描量热法研究了这些共混物的结晶行为。 PLM表明，SCBPE / LDPE，SCBPE / HDPE和SCBPE / EPDM形成了带状球晶，其带宽和尺寸均小于纯SCBPE。没有观察到球晶，但是在完全不混溶的SCBPE / PS中观察到微小的微晶，并且SCBPE / iPP中的微晶变小。只看到不规则的球晶。第二种聚烯烃极大地影响了SCBPE的结晶动力学和机械性能，但其方式不同，具体取决于第二种组分的相行为和模量。 SCBPE可能与LDPE，HDPE和EPDM在熔体中相混溶，但在结晶过程中会发生相分离。 SCBPE / iPP共混物的晶体形态和结晶动力学发生了很大变化。还通过动态力学分析（DMA）研究了共混物的机械性能。 DMA结果表明，共混物的拉伸模量与相行为无关，而仅取决于第二组分的模量。 （c）2005年Wiley Periodicals，Inc.

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