Preparation and Characterization of Core-Shell Type Versatate-Fluorocarbon Emulsion

2011 ◽  
Vol 183-185 ◽  
pp. 2055-2058
Author(s):  
Xiao Hui Gao ◽  
Yu Feng Li ◽  
Zhou Mao Yu
Keyword(s):  
Contact Angle ◽  
Particle Size ◽  
Shell Structure ◽  
Raw Materials ◽  
Core Shell ◽  
Seeded Emulsion Polymerization ◽  
Hard Shell ◽  
Fluorocarbon Emulsion ◽  
Core Shell Structure ◽  
Organic Fluorine

Versatate-fluorocarbon emulsion with core-shell structure was synthesized by seeded emulsion polymerization using versatate, organic fluorine and acrylate as raw materials. The influences of amount of organic fluorine and versatate, core-shell ratio on the properties of emulsion were discussed. The emulsion was characterized with contact angle analyzer, particle size, transmission electron microscopy (TEM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The results showed that the emulsion had good properties while w(organic fluorine)=6%, w(versatate)=8%, soft core-hard shell and w(core):w(shell)=3:2. The particle size is 110nm and with core-shell structure. The contact angle of emulsion film to water is 98.1º. The synergistic effect of versatate and fluorocarbon based on core-shell structure improve the over-all properties effectively.

scholarly journals In Situ Synthesis of Core-Shell-Structured SiCp Reinforcements in Aluminium Matrix Composites by Powder Metallurgy

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1201
Author(s):  
Xinghua Ji ◽  
Cheng Zhang ◽  
Shufeng Li
Keyword(s):  
Particle Size ◽  
Powder Metallurgy ◽  
Shell Structure ◽  
Ex Situ ◽  
Aluminium Matrix ◽  
Core Shell ◽  
Matrix Composites ◽  
Aluminium Matrix Composites ◽  
Core Shell Structure

SiCp reinforced aluminium matrix composites (AMCs), which are widely used in the aerospace, automotive, and electronic packaging fields along with others, are usually prepared by ex situ techniques. However, interfacial contamination and poor wettability of the ex situ techniques make further improvement in their comprehensive performance difficult. In this paper, SiCp reinforced AMCs with theoretical volume fractions of 15, 20, and 30% are prepared by powder metallurgy and in situ reaction via an Al-Si-C system. Moreover, a combined method of external addition and an in situ method is used to investigate the synergistic effect of ex situ and in situ SiCp on AMCs. SiC particles can be formed by an indirect reaction: 4Al + 3C → Al4C3 and Al4C3 + 3Si → 3SiC + 4Al. This reaction is mainly through the diffusion of Si, in which Si diffuses around Al4C3 and then reacts with Al4C3 to form SiCp. The in situ SiC particles have a smooth boundary, and the particle size is approximately 1–3 μm. A core-shell structure having good bonding with an aluminium matrix was generated, which consists of an ex situ SiC core and an in situ SiC shell with a thickness of 1–5 μm. The yield strength and ultimate tensile strength of in situ SiCp reinforced AMCs can be significantly increased with a constant ductility by adding 5% ex situ SiCp for Al-28Si-7C. The graphite particle size has a significant effect on the properties of the alloy. A criterion to determine whether Al4C3 is a complete reaction is achieved, and the forming mechanism of the core-shell structure is analysed.

Effect of core-shell structure latex on pigment coating properties

BioResources ◽  
2018 ◽  
Vol 14 (1) ◽  
pp. 1241-1251
Author(s):  
Kyudeok Oh ◽  
Araz Rajabi Abhari ◽  
Wanhee Im ◽  
Jee-Hong Lee ◽  
Zhenghui Shen ◽  
...  
Keyword(s):  
Pore Structure ◽  
Shell Structure ◽  
Coating Layer ◽  
Core Shell ◽  
Binding Ability ◽  
The Core ◽  
Coated Papers ◽  
Pigment Coating ◽  
Hard Shell ◽  
Core Shell Structure

The pore structure of the coating layer is one of the most important factors in determining the printability of coated papers. The coating pigment and binder are two principal components in paper coating, and their characteristics have a critical influence on the coating structure. The glass transition temperature (Tg) of latex binders affects the mechanical strength and pore structure of the pigment coating layer because the latex Tg influences the binding ability of latex and the shrinkage of the coating layer during the drying process. In this study, styrene-acrylate (S/A) core-shell structure latexes with different monomer compositions in the core and shell layers were designed, and their properties were compared with those of a conventional latex. These core-shell latexes were prepared using the same monomers in the same proportion and were used to investigate the effect of the core-shell structure on the structural and mechanical properties of the coating layer. The hard-shell latex with a high styrene content in the shell part yielded paper that was glossier and less rough and formed finer pores, resulting in an increased ink absorption rate into the coated paper compared to the other types of latex. The hard-shell structure showed better performance in printing uniformity and had less mottling.

Design and Preparation of Rubber Ideal Filler

2006 ◽  
Vol 11-12 ◽  
pp. 525-528 ◽  
Author(s):  
Jian Jun Zhou ◽  
Ya Kang Liu ◽  
Wei Zhao ◽  
You Ping Wu ◽  
Li Qun Zhang
Keyword(s):  
Shell Structure ◽  
Styrene Butadiene Rubber ◽  
Cross Linking ◽  
Core Shell ◽  
Butadiene Rubber ◽  
Seeded Emulsion Polymerization ◽  
Polymeric Particles ◽  
Core Shell Structure ◽  
The Stability ◽  
Styrene Butadiene

Since rubber was applied in people’s normal life, researchers have started to exploit the rubber reinforcing techniques and the relative mechanism. Developing high-effective, simple and economical reinforcing methods and fillers are the emphasis of rubber industry, technology and science. In this paper a rubber ideal filler (IF) is shown. This IF is a kind of composite with core-shell structure which was synthesized by seeded emulsion polymerization. It used styrene (St), polybutadiene oligomer (PBD) as monomers and divinyl benzene (DVB) as cross-linking agent. The effect of the amount of cross-linking agent, concentration of emulsifier and initiator on the stability of the emulsion was studied. The morphology of the latex particles with core-shell structure was characterized by high resolution SEM (ESEM) and DSC (Tg). The results showed that cross-linking polymeric particles exhibited strong reinforcing effect on styrene-butadiene rubber (SBR).

Synthesis, Morphology and Hydrophobicity of Core-Shell Fluoinated Copolymer Latexes

2013 ◽  
Vol 456 ◽  
pp. 471-473
Author(s):  
Ping Guo ◽  
Xiao Zhao ◽  
Zheng Gang Xiao
Keyword(s):  
Contact Angle ◽  
Water Absorption ◽  
Chemical Structure ◽  
Core Shell ◽  
Dsc Analysis ◽  
Seeded Emulsion Polymerization ◽  
Water Contact ◽  
Absorption Ratio ◽  
Transmission Electron ◽  
Core Shell Structure

The fluoroacrylate copolymer latexes (Poly (BA-MMA-DFMA) latex) with a fluorinated shell were successfully synthesized by semi-continuous seeded emulsion polymerization. The chemical structure of the latex was characterized by Fourier transform infrared (FTIR) and 1H-NMR analysis. Glass transition temperatures (Tg) of Poly (BA-MMA-DFMA) latex were confirmed by DSC analysis. Transmission electron microscopy (TEM) showed the microstructure of Poly (BA-MMA-DFMA) latex. The water absorption ratio and the water contact angle (WCA) of films were studied. Results showed the Poly (BA-MMA-DFMA) latex had two distinct Tg and exhibited core-shell structure. Moreover, Poly (BA-MMA-DFMA) film with 15wt% DFMA can exhibit lower water absorption ratio and higher contact angle.

Preparation of Core/Shell Composite Latex Particles and Toughening Modification for Polyamide 6

2009 ◽  
Vol 79-82 ◽  
pp. 2103-2106
Author(s):  
Xi Jun Liu ◽  
Hai Ping Li ◽  
Feng Li ◽  
Rui Xia Tian ◽  
Qing Li
Keyword(s):  
Shell Structure ◽  
Polyamide 6 ◽  
Core Shell ◽  
Melt Blending ◽  
Seeded Emulsion Polymerization ◽  
Latex Particles ◽  
The Core ◽  
Core Shell Structure ◽  
Average Size ◽  
Shell Composite

In this paper, a novel poly(butyl methacry1ate)/poly(methyl methacrylate-itaconic acid)(PBA/P(MMA-ITA)) latex particles with core/shell structure (CSR) was synthesized by the method of pre-emulsion semi-continuous seeded emulsion polymerization. The core/shell structure of CSR was characterized by TEM and confirmed that the average size of CSR particles was about 330 nm and that of PBA core was about 290 nm. The polyamide 6 (PA 6)/CSR blends (N/CSR) were prepared by the melt-blending technique, and its impact strength reached 40kJ•m-2 (more than 7 times higher than neat PA 6) when the ITA dosage was in the range of 4%~10%. The results of SEM showed that the high toughness of N/CSR blends was the result of the shear deformation of PA 6 matrix induced by cavitation of dispersed phase CSR.

Effect of temperature on the impact behavior of PVC/ASA binary blends with various ASA terpolymer contents

2019 ◽  
Vol 39 (5) ◽  
pp. 407-414 ◽  
Author(s):  
Xueqiang Zhang ◽  
Jun Zhang
Keyword(s):  
Shell Structure ◽  
Impact Behavior ◽  
Effect Of Temperature ◽  
Core Shell ◽  
Binary Blends ◽  
Heat Distortion Temperature ◽  
Different Temperatures ◽  
Hard Shell ◽  
Core Shell Structure ◽  
The Impact

AbstractAcrylonitrile-styrene-acrylic (ASA) terpolymer has a typical core-shell structure with poly(butyl acrylate) (PBA) as the soft core and styrene-acrylonitrile (SAN) copolymer as the hard shell. The impact behavior of poly(vinyl chloride) (PVC)/ASA binary blends with various ASA terpolymer contents was systematically investigated at three different temperatures (23°C, 0°C, and –30°C). With the addition of 30 phr ASA terpolymer, the impact strength of the blends increased by almost 45 times at 23°C and 29 times at 0°C compared with the neat PVC, respectively. Herein, ASA terpolymer particles were related to each other to form a percolation group and the stress field around the ASA particles was connected with each other, thereby more effectively served as the stress concentrators, exhibiting the highest toughening efficiency. In addition, the significantly improved toughness could also be attributed to the special core-shell structure of ASA terpolymer, as well as, a good miscibility between the PVC matrix and the SAN shell of the ASA terpolymer. However, the decreasing temperature limited the flexibility of the PBA chain, resulting in the insignificant role of ASA terpolymer in toughening PVC at –30°C. Moreover, the improvement in the toughness of the blends did not sacrifice its heat distortion temperature.

Synthesis and Characterization of PBA/aPS Core-Shell Latex Particles

2013 ◽  
Vol 631-632 ◽  
pp. 588-591
Author(s):  
Ming Jue Li ◽  
Ying Yan Diao ◽  
Xi Jun Liu
Keyword(s):  
Particle Size ◽  
Shell Structure ◽  
Average Particle Size ◽  
Morphological Structure ◽  
Shell Morphology ◽  
Polymerization Process ◽  
Core Shell ◽  
Average Particle ◽  
Latex Particles ◽  
Core Shell Structure

The core-shell structure copolymer of PBA/PS was prepared using pre-emulsion and semi-continues polymerization process. The particle size of core-shell latex and the St conversion of shell monomer were affected by emulsifier, initiator, pH and temperature etc. Meanwhile, the laser particle size analyzer, transmission electron microscope and other test methods were utilized to study latex particle average particle size, size distribution and morphological structure, respectively. The kinetics of polymerization was investigated. Well-defined core-shell structure and narrow particle sizedistribution could be achieved under starved conditions of monomer feeding. By the means of TEM found that PBA/PS latex particles had clearly core/shell morphology.

Preparation of Fluorocarbon Acrylic Emulsion with Core-Shell Structure Modified by Versatate Carbon

2012 ◽  
Vol 151 ◽  
pp. 57-60
Author(s):  
Yu Feng Li ◽  
Zhou Mao Yu ◽  
Jing Jing Zhu ◽  
Xiao Hui Gao
Keyword(s):  
Shell Structure ◽  
Raw Materials ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Core Shell ◽  
Mass Ratio ◽  
Water Contact ◽  
Acrylic Emulsion ◽  
Shell Mass ◽  
Core Shell Structure

Fluorocarbon acrylic emulsion with core-shell structure modified by versatate carbon were prepared with acrylic acid, versatate carbon monomer(VC), fluoride carbon monomer(FC) and methyl methacrylate as raw materials. The influence of the amount of FC and VC, the core/shell mass ratio on emulsion polymerization were discussed. The structure and properties were characterized by fouriertransform infrared spectrum(FT-IR), transmission electron microscopy(TEM), particle size analysis. The results showed that the emulsion had good properties while w(FC)=8%, w(VC)=6%, the ratio of the soft to hard monomer is 1:3 in core and the soft to hard monomer is 2:1 in shell, the mass ratio of the monomer in core to in shell is 1:1. The conversion of polymerization is 96.5%, the size of latex particle is 100nm, water contact angle of the emulsion film is 100.5°, water-absorption ration of the film is 6.5%. The versatate improved the property of fluorocarbon acrylic emulsion.

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