کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
674214 | 1459548 | 2012 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Crystallization behavior and melting characteristics of wollastonite filled β-isotactic polypropylene composites Crystallization behavior and melting characteristics of wollastonite filled β-isotactic polypropylene composites](/preview/png/674214.png)
In order to obtain wollastonite filled β-iPP composites, wollastonite treated with pimelic acid (W*) were prepared with various mass ratios of wollastonite/pimelic acid (W/PA). The crystallization behavior, melting characteristics and β-nucleating ability of iPP composites filled with wollastonite (W) and W* were investigated by DSC and XRD. The results indicated that addition of wollastonite increased the crystallization temperatures of iPP, but the crystallization temperatures of iPP in iPP/W* composites were higher than those of iPP/W composites, which proved that the β-nucleation of W* is stronger than untreated wollastonite. Although iPP/wollastonite composites mainly form α-phase iPP, modification of wollastonite by PA significantly enhanced nucleation of β-phase iPP. The β-nucleating ability of W* depend on the amount of formed calcium pimelate, therefore the β-phase contents of β-iPP/W* composites increased with increasing W* content and decreasing mass ratio of W/PA. Moreover, there exist different critical mass ratios of W/PA for preparation of β-iPP composites filled with different W* contents with highest β-phase content and low cost.
► High β-phase content iPP composites with low cost and easy process were prepared.
► The β-nucleation of wollastonite was enhanced significantly through reaction.
► Mass ratios of wollastonite/pimelic acid on iPP crystallization were investigated.
► Increasing the content of treated wollastonite will increase β-phase content.
Journal: Thermochimica Acta - Volume 536, 20 May 2012, Pages 47–54