Using Vinyl Acetate,N-Hydroxymethyl Acrylamide, and Montmorillonite Intercalated by a Dioctadecyl Dimethyl Ammonium Bromide Surfactant to Prepare Exfoliated Nanocomposite through In Situ Polymerization

2015 ◽  
Vol 36 (2) ◽  
pp. 211-219 ◽  
Author(s):  
Hui-Wang Cui ◽  
Qun Fang ◽  
Guan-Ben Du
Keyword(s):  
Vinyl Acetate ◽  
In Situ Polymerization ◽  
Ammonium Bromide ◽  
Dimethyl Ammonium ◽  
Exfoliated Nanocomposite

Synthesis and Electrical Conductivity Measurement of Polyaniline / Vermiculite Nanocomposites

2010 ◽  
Vol 96 ◽  
pp. 221-226
Author(s):  
Hong Juan Sun ◽  
Ying Liu ◽  
Tong Jiang Peng ◽  
Hai Feng Liu ◽  
Jin Mei Sun
Keyword(s):  
Electrical Conductivity ◽  
Interlayer Space ◽  
In Situ Polymerization ◽  
Conductivity Measurement ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Electrical Conductivity Measurement ◽  
X Ray ◽  
Dimethyl Ammonium

A series of polyaniline/vermiculite nanocomposites was synthesized. The interlayer space of vermiculite was initially increased by the insertion of dioctadecyl dimethyl ammonium bromide, and then the aniline monomers were inserted into the interlayer space of vermiculite replacing dioctadecyl dimethyl ammonium cations. The polyaniline/vermiculite nanocomposites materials were prepared via in situ polymerization of the aniline monomers in the interlayer space of vermiculite. The as-synthesized polyaniline/vermiculite nanocomposite materials were characterized by X-ray diffraction analysis, infrared spectroscopy, and electrical conductivity measurement. The results indicated that the vermiculite was peeled off into the polyaniline. The introduction of vermiculite nanosheets showed a beneficial effect on the electrical conductivity of polyaniline.

Juvenile and Mature Pinewoods Treated by in situ Polymerization with Poly(vinyl acetate)

2021 ◽  
Author(s):  
Andrey Acosta ◽  
Ezequiel Gallio ◽  
Paula Zanatta ◽  
Henrique Schulz ◽  
Rafael de Avila Delucis ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
In Situ Polymerization

scholarly journals Combined Chemical Modification of Bamboo Material Prepared Using Vinyl Acetate and Methyl Methacrylate: Dimensional Stability, Chemical Structure, and Dynamic Mechanical Properties

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1651 ◽  
Author(s):  
Saisai Huang ◽  
Qiufang Jiang ◽  
Bin Yu ◽  
Yujing Nie ◽  
Zhongqing Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Chemical Modification ◽  
Methyl Methacrylate ◽  
Vinyl Acetate ◽  
Dimensional Stability ◽  
Chemical Structure ◽  
In Situ Polymerization ◽  
Dynamic Mechanical Properties

Acetylation and in situ polymerization are two typical chemical modifications that are used to improve the dimensional stability of bamboo. In this work, the combination of chemical modification of vinyl acetate (VA) acetylation and methyl methacrylate (MMA) in situ polymerization of bamboo was employed. Performances of the treated bamboo were evaluated in terms of dimensional stability, wettability, thermal stability, chemical structure, and dynamic mechanical properties. Results show that the performances (dimensional stability, thermal stability, and wettability) of bamboo that was prepared via the combined pretreatment of VA and MMA (VA/MMA-B) were better than those of raw bamboo, VA single-treated bamboo (VA-B), and MMA single-treated bamboo (MMA-B). According to scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analyses, VA and MMA were mainly grafted onto the surface of the cell wall or in the bamboo cell lumen. The antiswelling efficiency and contact angle of VA/MMA-B increased to maximum values of 40.71% and 107.1°, respectively. From thermogravimetric analysis (TG/DTG curves), the highest onset decomposition temperature (277 °C) was observed in VA/MMA-B. From DMA analysis, the storage modulus (E’) of VA/MMA-B increased sharply from 15,057 Pa (untreated bamboo) to 17,909 Pa (single-treated bamboo), and the glass transition temperature was improved from 180 °C (raw bamboo) to 205 °C (single-treated bamboo).

scholarly journals In-Situ Polymerization of High-Molecular Weight Nylon 66 Modified Clay Nanocomposites with Low Apparent Viscosity

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 510 ◽  
Author(s):  
Xiaochao Duan ◽  
Yanpeng Wu ◽  
Zhao Chen ◽  
Tonghui Yang ◽  
Yongchang Cheng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Cross Sections ◽  
Apparent Viscosity ◽  
In Situ Polymerization ◽  
Ammonium Bromide ◽  
Nylon 66 ◽  
Modified Clay ◽  
Viscosity Reducer

High-molecular weight nylon 66/modified clay (Mclay) nanocomposites with a low apparent viscosity were prepared by in-situ polymerization and post solid-state polycondensation. Thermogravimetric analysis and X-ray diffraction patterns of the Mclay revealed that cetyltrimethyl ammonium bromide successfully inserted into the interlayers of the clay. Scanning electron microscope images of the cross sections showed that the Mclay was well-dispersed in the nylon 66 matrix. The effects of clay on the mechanical, rheological, and thermal properties of the nanocomposites were investigated using an Instron 5969 machine, a capillary rheometer, and a differential scanning calorimeter. The results indicated that the incorporation of a very small amount of Mclay considerably decreased the shear viscosity of the nanocomposites and increased the melt index, acting as a viscosity reducer. More importantly, the mechanical properties and spinnability of the nylon 66/Mclay nanocomposites were not affected by the viscosity reducer.

Preparation of jujube-cake structure membranes through in situ polymerization of hyperbranched polysiloxane in ethylene-vinyl acetate matrix for separation of ethyl acetate from water

RSC Advances ◽  
2016 ◽  
Vol 6 (22) ◽  
pp. 18308-18318 ◽  
Author(s):  
Chun-fang Zhang ◽  
Guo-liang Wu ◽  
Liang-liang Dong ◽  
Jun Tang ◽  
Yun-xiang Bai ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Vinyl Acetate ◽  
In Situ Polymerization ◽  
Ethylene Vinyl Acetate ◽  
Hyperbranched Polysiloxane

The addition of hyperbranched polysiloxane (HPSiO) could improve the hydrophobic of the membranes which is helpful to recover EA from water.

Preparation and characterization of exfoliated nanocomposite prepared by vinyl acetate, montmorillonite and dioctadecyl dimethyl ammonium bromide

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Huiwang Cui ◽  
Guan-ben Du
Keyword(s):  
Vinyl Acetate ◽  
Particle Diameter ◽  
Nano Particles ◽  
Ammonium Bromide ◽  
Stress Effect ◽  
Nano Composite ◽  
Transmission Electron ◽  
The Matrix ◽  
Dimethyl Ammonium ◽  
Power Law Function

AbstractIn the paper, an exfoliated nano-composite was prepared by vinyl acetate (VAc), montmorillonite (MMT) and dioctadecyl dimethyl ammonium bromide (DOAB).Then it was mainly studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and static tension. Its rheology was also investigated by the power-law function equation and the Cross-Williamson model viscous equation. Results showed that the exfoliated nano-composite was obtained. Linear macromolecular chains of polyvinyl acetate (PVAc) were formed in the layers of MMT-DOAB. MMT-DOAB was exfoliated into layers or sheets of nano-particles, and randomly dispersed in the matrix of PVAc. The particle diameter of MMT-DOAB was from 25 nm to 75 nm, while PVAc’s was from 250 nm to 500 nm. They randomly dispersed together. The smaller MMT-DOAB particles were adsorbed around the bigger PVAc particles; they formed the “Strawberry” structure. In addition, PVAc and PVAc- MMT-DOAB were pseudo-plastic Non-Newtonian fluids, they all possessed the normal stress effect (or Weissenberg effect), that was the pole-climbing phenomenon. The reasonable addition of MMT-DOAB in polymerization was better but not more than 2.0 wt% of VAc.

scholarly journals In-situ Polymerization of exfoliated structure PA6/organo-clay nanocomposites

2020 ◽  
Vol 59 (1) ◽  
pp. 434-440
Author(s):  
Yiming Sun ◽  
Jie Mei ◽  
Huan Hu ◽  
Jiru Ying ◽  
Weiyi Zhou ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
In Situ Polymerization ◽  
Polyamide 6 ◽  
Interlayer Distance ◽  
Polymerization Process ◽  
Ammonium Bromide ◽  
Transmission Electron ◽  
Cetyl Trimethyl Ammonium ◽  
20 Nm

AbstractMontmorillonite (MMT) was modified with cetyl trimethyl ammonium bromide (CTAB) to obtain organomontmorillonite (OMMT) by stirring and pulsed ultrasonic mixing. Polyamide 6 (PA6)/OMMT nanocomposites were then prepared via in-situ polymerization.The resulting OMMT and PA6/OMMT nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results suggested that the OMMT interlayer distance was greatly increased to 3.13 nm due to CTAB being inter-calated into the MMT galleries. The OMMT interlayer distance was further enlarged to 10-20 nm during the polymerization process. The OMMT layers were exfoliated into nanoscale layers and uniformly dispersed in the molten ∈-caprolactam and PA6 matrix, and exfoliated structure nanocomposites were formed.

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