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首页> 外文期刊>Nanotechnology >Microporous poly vinyl chloride: novel reactor for PVC/CaCO_3 nanocomposites
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Microporous poly vinyl chloride: novel reactor for PVC/CaCO_3 nanocomposites

机译：微孔聚氯乙烯：用于PVC / CaCO_3纳米复合材料的新型反应器

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摘要

Microporous polyvinyl chloride (PVC) with pore size of 0.2-2 mu m has been obtained by the foaming of PVC powders using a solution of 2,2'-azo-bis-iso-butyronitrile in a co-solvent of butanone and cyclohexanone. The PVC/CaCO_3 hybrid powders deposited with CaCO_3 nanoparticles have been synthesized using the microporous PVC as reactors of CaCO_3 nanoparticles, i.e., the reaction of Ca(OH)_2 with CO_2 occurs inside the pore of microporous PVC. The in situ PVC/CaCO_3 nanocomposites have been prepared by melt blending in situ PVC/CaCO_3 hybrid powders. The images of SEM and TEM show that the in situ CaCO3 nanoparticles are uniformly dispersed in the PVC matrix and the sizes of the CaCO_3 nanoparticles are less than 50 nm. TEM images and XRD patterns for the in situ CaCO_3 strongly suggest that pseudo-amorphous crystals and defect-rich crystals are formed. The mechanical properties and DMA data indicate that the in situ PVC/CaCO_3 nanocomposites exhibit much higher strength, toughness, modulus and glass temperature than common PVC/CaCO_3 nanocomposites. This novel nanotechnology has potential applications in preparation of organic-inorganic hybrid nanocomposites.
机译：通过使用2,2'-偶氮-双-异-丁腈在丁酮和环己酮的共溶剂中的溶液使PVC粉末发泡，可以获得孔径为0.2-2μm的微孔聚氯乙烯（PVC）。已经使用微孔PVC作为CaCO_3纳米颗粒的反应器合成了沉积有CaCO_3纳米颗粒的PVC / CaCO_3杂化粉末，即，Ca（OH）_2与CO_2的反应发生在微孔PVC的孔内。通过熔融共混原位PVC / CaCO_3杂化粉制备原位PVC / CaCO_3纳米复合材料。 SEM和TEM图像表明，原位CaCO3纳米颗粒均匀地分散在PVC基体中，并且CaCO_3纳米颗粒的尺寸小于50nm。原位CaCO_3的TEM图像和XRD图谱强烈表明形成了伪非晶晶体和富缺陷晶体。力学性能和DMA数据表明，原位PVC / CaCO_3纳米复合材料比普通PVC / CaCO_3纳米复合材料具有更高的强度，韧性，模量和玻璃温度。这种新颖的纳米技术在制备有机-无机杂化纳米复合材料方面具有潜在的应用。

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