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首页> 外文期刊>Journal of Applied Polymer Science >Use of a bis(aminoalkyl)-calix[4]arene derivative as cross-linking agent to enhance functional and mechanical properties of a maleated polypropylene
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Use of a bis(aminoalkyl)-calix[4]arene derivative as cross-linking agent to enhance functional and mechanical properties of a maleated polypropylene

机译：使用双（氨基烷基）-calix [4]芳烃衍生物作为交联剂，以增强马来酸的聚丙烯的官能和机械性能

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摘要

An isotactic polypropylene grafted by 1 wt% of maleic anhydride (iPP-g-MAH) was chemically modified to provide it with new functional abilities and improved mechanical properties. The specific additive considered in this work is a derivative of bis(aminoalkyl)-calix[4]arene. Not only this molecule serves as a cross-linking agent, but it offers grafting sites for metallic ions that confer electrolytic conductivity to the initially insulating polyolefin. Materials were synthesized by reactive extrusion, and subsequently manufactured as plates by injection molding. The three-dimensional macromolecular architecture was optimized by adjusting the NH2:MAH molar ratio in a range from 0.5:1 to 1:1. Fourier transform infrared spectroscopy revealed the amine/ anhydride chemical reactions, while gel content measurements were used to determine the degree of cross-linking. The crystalline microstructure of the different materials was characterized by two complementary methods: (a) overall crystallinity by differential scanning calorimetry; (b) lamellar thickness by thermal fractionation using the self-successive auto-nucleation procedure. Only a small decrease of the crystalline lamellae is observed. The mechanical properties were determined by a video-controlled tensile testing method and by Brillouin spectroscopy. A transition from brittle to ductile behavior was observed for increasing cross-links density. Scanning electron microscopy on fracture surfaces showed that ductile fracture was favored by the development of fibrils.
机译：对马来酸酐接枝的等规聚丙烯（iPP-g-MAH）进行化学改性，使其具有新的功能性和更好的力学性能。本研究中考虑的特定添加剂是双（氨基烷基）-杯[4]芳烃的衍生物。这种分子不仅起到交联剂的作用，而且还为金属离子提供了接枝位点，从而使最初绝缘的聚烯烃具有电解导电性。材料通过反应挤出合成，然后通过注射成型制成板材。通过调节NH2:MAH摩尔比在0.5:1至1:1范围内，优化了三维大分子结构。傅里叶变换红外光谱揭示了胺/酸酐的化学反应，而凝胶含量测量用于确定交联程度。通过两种互补的方法对不同材料的结晶微观结构进行了表征：（a）通过差示扫描量热法测定整体结晶度；（b） 通过使用自连续自动成核程序的热分馏实现层状厚度。仅观察到结晶片层的少量减少。机械性能通过视频控制拉伸测试方法和布里渊光谱测定。随着交联密度的增加，观察到了从脆性到韧性的转变。断口扫描电镜显示，纤维的发育有利于韧性断裂。

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