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首页> 外文期刊>Journal of Applied Polymer Science >Functionalization of polypropylene at high temperature under oxidative/inert environment
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Functionalization of polypropylene at high temperature under oxidative/inert environment

机译：聚丙烯在高温下的氧化/惰性环境下功能化

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摘要

Functionalization of polypropylene (PP) has been investigated using the high-temperature route. The advantage of the high-temperature functionalization is the introduction of cheaper, long-term stable and environmentally friendly routes for generating surface active groups on PP. In this regard, extensive experimental work was undertaken to investigate the influence of the high-temperature (40-360°C) treatment, reaction time, and inert/oxidative gas environments on generation of functional groups on PP. The thermal gravimetric analysis and differential scanning calorimeter techniques were used to study the changes in the temperature of melting/crystallization and the crystallinity of the treated PP samples. Scanning electron microscopic analysis showed that the high-temperature treatment under inert/oxidative affects the surface/morphology of PP samples. Fourier transform infrared (FTIR) was used to examine the surface species formation and the stability of functional groups. FTIR results of the thermally treated PP showed the selective formation of monosubstituted alkenes under inert atmosphere, while the formation of hydroperoxides, carbonyl, lactones, and substituted alkenes stable species was observed under oxidative atmosphere. The changes in the molecular weight of the treated PP under different conditions were evaluated using high-temperature gel permeation chromatography (HTGPC) technique. The extent of functionalization of PP up to 20% or more could be obtained by using the different oxidation conditions.
机译：已经使用高温途径研究了聚丙烯（PP）的官能化。高温官能化的优点是引入了更便宜，长期稳定且环保的途径，以在PP上生成表面活性基团。在这方面，进行了广泛的实验工作以研究高温（40-360°C）处理，反应时间和惰性/氧化性气体环境对PP上官能团生成的影响。用热重分析和差示扫描量热仪技术研究了处理后的PP样品的熔融/结晶温度和结晶度的变化。扫描电子显微镜分析表明，惰性/氧化条件下的高温处理会影响PP样品的表面/形貌。傅里叶变换红外（FTIR）用于检查表面物质的形成和官能团的稳定性。热处理PP的FTIR结果表明，在惰性气氛下选择性形成了单取代烯烃，而在氧化气氛下观察到了过氧化氢，羰基，内酯和取代烯烃稳定物种的形成。使用高温凝胶渗透色谱（HTGPC）技术评估在不同条件下处理后的PP的分子量变化。通过使用不同的氧化条件，可以获得高达20％或更高的PP官能度。

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