The combined nucleation effect of graphene oxide (GO) and calcium pimelate (CaPi) which are chemically compound together (expressed in GO − CaPi) in isotactic polypropylene (iPP) was investigated. Fourier transform infrared (FTIR), X‐ray diffraction (XRD) and thermogravimetric analysis (TGA) verified that CaPi was chemically compound with GO by chelate bonds. The crystallization behavior and crystalline morphologies of iPP nucleated with different mass ratio of GO and CaPi were investigated. The crystallization peak temperature of iPP nucleated with 0.2 wt% GO − CaPi with the mass ratio of 1:5 (GO1 − C5) was increased by 8.3°C when compared with that of pure iPP, and the relative content of β‐crystal reached up to 0.7962. Whereas, the crystallization peak temperature of iPP nucleated with 0.2 wt% GO and CaPi which are blended together by mechanical force (expressed in GO + CaPi) with the mass ratio of 1:5 (GO1 + C5) was only increased by 5.0°C. It was attributed to that the aggregation of GO + CaPi caused the decrease of the crystallization peak temperature, while the GO1 − C5 uniformly dispersed in the iPP matrix. Unexpectedly, the relative content of β‐crystal of iPP nucleated with 0.02 wt% GO1 − C5 reached up to 0.8094, and the crystallization peak temperature was increased by 6.7°C compared with that of pure iPP. Meanwhile, the impact strength, tensile strength and heat deflection temperature of iPP nucleated with 0.02 wt% GO1 − C5 increased by almost 45.86%, 2.03% and 7.7°C, respectively. The iPP nucleated with GO1 − C5 obtained a balance between stiffness and toughness and the thermo‐mechanical property of nucleated iPP was improved.

中文翻译：

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化学复合氧化石墨烯-庚二酸钙对全同立构聚丙烯结晶行为，形态和力学性能的综合影响

研究了在等规聚丙烯（iPP）中化学复合在一起的氧化石墨烯（GO）和庚二酸钙（CaPi）在GO-CaPi中的联合成核作用。傅里叶变换红外（FTIR），X射线衍射（XRD）和热重分析（TGA）证明，CaPi通过螯合键与GO发生化学复合。研究了GO和CaPi质量比不同的iPP的成核行为和晶形。质量比为1：5（GO1-C5）的0.2 wt％GO-CaPi成核的iPP的结晶峰温度与纯iPP相比提高了8.3°C，β晶体的相对含量达到高达0.7962。iPP的结晶峰温度成核为0。通过机械力（以GO + CaPi表示）以1：5的质量比（GO1 + C5）混合在一起的2 wt％GO和CaPi仅增加了5.0°C。这归因于GO + CaPi的聚集导致结晶峰温度的降低，而GO1-C5均匀地分散在iPP基质中。出乎意料的是，与纯iPP相比，以0.02 wt％GO1-C5成核的iPP的β-晶体的相对含量高达0.8094，且结晶峰温度升高了6.7°C。同时，以0.02wt％的GO1-C5成核的iPP的冲击强度，拉伸强度和热变形温度分别增加了近45.86％，2.03％和7.7°C。