Thermal stability of nucleation effect of different [beta]-nucleating agents in isotactic polypropylene

• Published in: Journal of thermal analysis and calorimetry 2018-06, Vol.132 (3), p.1845
• Main Authors: Zhou, Pei-Zhang, Zhang, Yue-Fei, Lin, Xiang-Feng
• Format: Article
• Language: English
• Subjects: Polypropylene
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-018-7079-0

The thermal stability of nucleation effect of three highly effective [beta]-nucleating agents, namely an aryl diamide-based nucleating agent (TMB-5), a rare earth complex (WBG-II), and calcium pimelate (Ca-Pi) in isotactic polypropylene (iPP) was investigated by DSC multi-scanning cycles. All three nucleating agents induced iPP to form high contents of [beta]-crystals. After several thermal cycles, the relative content of [beta]-phase crystals (K.sub.DSC) in the nucleated iPP was decreased and the crystallization peak temperature ( [Formula omitted]) was also decreased. The K.sub.DSC and [Formula omitted] of iPP nucleated with TMB-5, WBG-II, and Ca-Pi were decreased by 0.0477, 0.1257, 0.0603, and 0.97, 2.71, 1.18 °C, respectively. It indicated that the nucleation effect became worse. The nucleation effect of TMB-5 decreased less while that of WBG-II and Ca-Pi was significantly reduced. Thus, the orders of thermal stability for nucleation effect of these three nucleating agents were TMB-5 > Ca-Pi > WBG-II.