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Nanoscale Research Letters · 2016 ·Vol. 11 ·期 1 ·1-7 · IF 2.584

Small Molecule-Assisted Exfoliation of Layered Zirconium Phosphate Nanoplatelets by Ionic Liquids

Xia Fangqing,Yong Huaisong,Han Xiao,Sun Dazhi

Exfoliation of layered inorganic nanomaterials into single-layered sheets has been widely interested in materials chemistry and composite fabrication. Here, we report the exfoliation of layered zirconium phosphate nanoplatelets by using small molecule intercalating agents in ionic liquids, which opens a new platform for fabricating single-layered inorganic materials from synthetic layered compounds.

研究领域: 材料化学 · 纳米材料科学 · 复合材料制备

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POLYMER INTERNATIONAL · 2017 ·Vol. 66 ·期 12 ·1891-1896 · IF 2.07

Tri-ammonium end functional polyethylene: facile synthesis and application as an intercalation agent

Yongjie Zhang,Xiaopei Li,Shuwei Wang,Jing Xu,Huayi Li

Organo-modification of montmorillonite (MMT) is crucial for the promotion of a fine dispersion of MMT into an (often hydrophobic) polymer matrix. Ammonium-terminated polymers are more efficient in modifying clay compared to small organic cations such as alkyl ammoniums or side functionalized polymers. Herein, tri-amino end functional polyethylene (PE-3 N) with low molecular weight was first synthesized via an efficient and robust epoxide ring-opening reaction by treating epoxide-terminated PE with diethylenetriamine. The chemical structure of PE-3 N was unambitiously characterized by chromatographic and spectral methods. By reacting with excess HCl, PE-3 N was subsequently converted to tri-ammonium end functional polyethylene (PE-3 N + ), which serves as an intercalation agent of MMT. By adjusting the weight ratio of PE-3 N + to pristine MMT ( R P/M ) applied in the static melt intercalation process, correlations between the extent of exfoliation and R P/M were successfully established. XRD results revealed that complete exfoliation of MMT could be afforded with R P/M as low as 1, which is the lowest value ever reported for ammonium-terminated polymers applied as intercalation agents. SEM micrographs showed that MMT sheets were swollen by PE-3 N + , affirming the successful modification of MMT. The PE modified MMT obtained may find application in preparing high-performance PE/MMT nanocomposites. © 2017 Society of Chemical Industry

CAS / MDL: 111-40-0

研究领域: 材料科学 · 高分子化学

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POLYMERS FOR ADVANCED TECHNOLOGIES · 2014 ·Vol. 25 ·期 8 ·872-880 · IF 1.964

Roles of organic intercalation agent with flame retardant groups in montmorillonite (MMT) in properties of polypropylene composites

Hongfang Zhu,Juan Li,Yingke Zhu,Shengjiao Chen

Three kinds of organic intercalation agent containing flame retardant groups, melamine (MA), triphenylphonium (TPP) chloride, and tetradecyl trihexyl phosphonium (TTP) bromide were intercalated into montmorillonite (MMT) via cation exchange reactions. These modified MMTs are combined with intumescent systems and compounded with PP. The flame retardant and thermal properties of the PP composites are studied. The organic intercalation agents in the layers of MMT play important roles in the char formation and flame retardant properties of PP composites. MA shows a better performance in limiting oxygen index (LOI) value and TPP helps to increase UL-94 properties, whereas TTP maintains or deteriorates the flame retardancy of polypropylene/intumescent flame retardant (IFR) composites. The LOI and UL-94 properties increase firstly and then decrease as the content of MMT increases. The MA acts as a blowing agent and emits an inert gas to provide migration impetus, which results in a better intumescent structured and stronger char to endure heat erosion. Although TPP and TTP emit combustible gas that burn, especially for TTP as it has a more flammable aliphatic chain. The synergistic effect between MA-MMT and IFR is better than that for TPP-MMT and TTP-MMT. Copyright © 2014 John Wiley & Sons, Ltd.

CAS / MDL: 2751-90-8

研究领域: 材料科学 · 高分子化学

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Small Molecule-Assisted Exfoliation of Layered Zirconium Phosphate Nanoplatelets by Ionic Liquids

Tri-ammonium end functional polyethylene: facile synthesis and application as an intercalation agent

Roles of organic intercalation agent with flame retardant groups in montmorillonite (MMT) in properties of polypropylene composites