Crystal structure of polypropylene filled with rare earth oxides

✍ Scribed by Chunmin Ye; Jingjiang Liu; Zhishen Mo; Gongben Tang; Xiabin Jing

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 443 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960613)60:11<1877::aid-app11>3.0.co;2-z

✦ Synopsis

SYNOPSIS

The effect of a fine powder of Y203, Ndz03, and Ho203 on the crystal structure of isotactic polypropylene (iPP) was studied with WAXD and DSC techniques. The results showed that the addition of the three rare earth oxides (REOs) can increase the crystallite size of the a-form crystal and the degree of crystallinity of i P P at an annealing temperature of 120°C and that both Yz03 and Nd203 are the p-nucleator of iPP. REOs enhance the overall growth rate of the spherulites of iPP. All the iPP samples filled with REOs which were crystallized isothermally a t 132°C from the melt exhibited their melting peaks of the pform on the DSC heating traces, indicating that the REOs are the nucleating agents for both the a-and p-forms of i P P under isothermal conditions.