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首页> 美国卫生研究院文献>Polymers >Systematic Investigation on the Structure-Property Relationship in Isotactic Polypropylene Films Processed via Cast Film Extrusion
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Systematic Investigation on the Structure-Property Relationship in Isotactic Polypropylene Films Processed via Cast Film Extrusion

机译：通过铸膜挤压加工的全同立构聚丙烯薄膜结构性质关系的系统研究

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摘要

The effect of cast film extrusion processing conditions, such as the chill-roll temperature, temperature of the melt, and line speed, on the structure of different isotactic polypropylene homo- and random copolymers has been investigated by means of Small- and Wide-Angle X-ray Scattering (SAXS and WAXS) and correlated to stiffness and haze. Stiffness and transparency have been found to be strongly dependent on the temperature of the chill-roll. Interestingly, line speed has been found to affect the total crystallinity when the chill-roll temperature is increased, while an overall minor effect of the melt temperature was found for all cast films. The polymer characteristics, defined by the catalyst nature and comonomer content, affect the final material performance, with the single-site catalyzed grades performing better in both mechanics and optics. Haze levels were found to correlate with the mesophase content rather than to α-crystallinity and to be dependent on the domain size for all grades. The remarkably low haze levels reached by the single-site grade with higher isotacticity can arise from high nucleation rate and orientational effects, which ultimately yield smaller and smoother scattering domains.
机译：通过小小的角度研究了浇铸膜挤出加工条件，例如冷轧温度，熔体温度，熔体温度，熔体温度，熔体温度和线速度的效果已经研究了不同全同立构聚丙烯均外和无规共聚物的结构X射线散射（萨克斯和蜡）并与刚度和雾度相关。已经发现刚度和透明度强烈依赖于冷却辊的温度。有趣的是，已经发现线速度影响冷却辊温度升高时的总结晶度，而所有浇铸膜都会发现熔体温度的总体微小效果。由催化剂性质和共聚单体含量定义的聚合物特性影响最终的材料性能，用机械和光学均更好地表现出更好的单位催化等级。发现雾度水平与中间相含量而不是α结晶性，并依赖于所有等级的畴大小。单位等级具有较高的单位性度达到的显着低的阴霾水平可能来自高核酸率和定位效应，最终产生较小和更平滑的散射域。

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