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In situ generation of a self-dispersed β-nucleating agent with increased nucleation efficiency in isotactic polypropylene
Polymer ( IF 4.6 ) Pub Date : 2018-07-11 , DOI: 10.1016/j.polymer.2018.07.023
Shicheng Zhao , Wei Qin , Zhong Xin , Shuai Zhou , Hanzhang Gong , Yeming Ni , Ke Zhang

Addition of a β-nucleating agent (β-NA) is the most effective method of preparing β-nucleated isotactic polypropylene (β-iPP); however, the poor dispersion and agglomeration of β-NAs limit nucleation efficiency. To solve this problem, a self-dispersing β-NA strategy was developed based on in situ preparation of β-NA (instead of pre-addition) during the processing of iPP. Zinc adipate (ZnAA), a typical β-NA, was chosen; self-dispersed ZnAA (ZnAA(IS)) was prepared in situ from its reaction precursors adipic acid (AA) and zinc oxide (ZnO) during extrusion of iPP. In situ preparation of ZnAA(IS) led to a significantly higher nucleation efficiency than pre-addition of ZnAA. The β-crystal content (kβ value) of nucleated iPP prepared with ZnAA(IS) reached 0.99, significantly higher than iPP prepared with ZnAA. Moreover, the impact strength of 0.1 wt % ZnAA(IS)/iPP composites was nearly 5.3-fold higher than neat iPP with a net gain in reinforcement (157%) compared to pre-addition of ZnAA. To explain these phenomena, we proposed mechanism for the self-dispersion of β-NA in the context of in situ generation of β-NA during iPP processing; the mechanism was confirmed by Fourier Transform Infrared Spectroscopy (FTIR), Polarized Optical Microscopy (POM), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) data. Therefore, this strategy and method of preparing β-NA in situ offers unique advantages that will advance the production and application of β-iPP. Furthermore, this strategy could potentially be extended to solve issues of poor dispersion and agglomeration for other additives.



中文翻译:

在全同立构聚丙烯中原位生成具有提高成核效率的自分散β成核剂

添加β-成核剂(β-NA)是制备β-成核的等规聚丙烯(β-iPP)的最有效方法。然而,β-NAs的分散性和团聚性差限制了成核效率。为了解决这个问题,基于在iPP加工过程中原位制备β-NA(而不是预先添加),开发了一种自分散β-NA策略。选择典型的β-NA己二酸锌(ZnAA);在iPP挤出过程中,由其反应前体己二酸(AA)和氧化锌(ZnO)原位制备自分散的ZnAA(ZnAA(IS))。原位制备ZnAA(IS)的成核效率比预先添加ZnAA高得多。的β晶体分率(ķ βZnAA(IS)制备的有核iPP值达到0.99,显着高于ZnAA制备的iPP。此外,与预先添加ZnAA相比,0.1 wt%ZnAA(IS)/ iPP复合材料的冲击强度比纯iPP高近5.3倍,增强净增加(157%)。为了解释这些现象,我们提出了在iPP加工过程中原位生成β-NA的过程中β-NA自分散的机制。通过傅立叶变换红外光谱(FTIR),偏振光学显微镜(POM),扫描电子显微镜(SEM)和透射电子显微镜(TEM)数据证实了该机理。因此,这种原位制备β-NA的策略和方法具有独特的优势,将促进β-iPP的生产和应用。此外,

更新日期:2018-07-11
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