The Compositional Effect of Water-Soluble POSS Hybrid PNIPA Nanocomposite Hydrogels

2014 ◽  
Vol 1044-1045 ◽  
pp. 133-136
Author(s):  
Yi Chen ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng ◽  
Jun Hong Yang
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Radical Polymerization ◽  
Network Structure ◽  
Compression Strength ◽  
Water Soluble ◽  
Elongation At Break ◽  
Compositional Effect ◽  
Nanocomposite Hydrogels

The nanosized water-soluble Oa-POSS particles were added into the PNIPA hydrogels by in situ radical polymerization as a reinforce agent. The mechanical properties are determined by the composition of gels. With the increase of Oa-POSS, the tensile and compression strength is enhanced significantly, while, the elongation at break is still low. The increased BIS, related to the tighter network structure, results in better compression strength, but the tensile properties is not improved obviously.

The Study on Mechanical Properties of POSS Hybrid PVA Hydrogels

2014 ◽  
Vol 1022 ◽  
pp. 30-33
Author(s):  
Yi Chen ◽  
Jun Hong Yang ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compression Strength ◽  
Water Soluble ◽  
Polymer Chains ◽  
Hybrid Nanocomposite ◽  
Nanocomposite Hydrogels

A novel POSS hybrid nanocomposite hydrogels were synthesized by introducing water-soluble Oa-POSS into the PVA hydrogels. The mechanical properties are obviously dependent on the composition of gels. With the increase of Oa-POSS, the tensile strength and modulus increases significantly while the elongation break decreases. The gels exhibit higher compression strength than pure PVA hydrogels. This phenomenon is attributed to the effective entanglement of polymer chains around nanoparticles and enhanced interaction between PVA chains.

The Swelling Behavior of Water-Soluble POSS Hybrid PNIPA Nanocomposite Hydrogels

2014 ◽  
Vol 1022 ◽  
pp. 34-37
Author(s):  
Yi Chen ◽  
Jun Hong Yang ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng
Keyword(s):  
Radical Polymerization ◽  
Water Soluble ◽  
Swelling Behavior ◽  
Swelling Ratio ◽  
Nanocomposite Hydrogels ◽  
Swelling Rate

The nanosized water-soluble Oa-POSS particles were added into the PNIPA hydrogels by in situ radical polymerization as a reinforce agent. The swelling behavior including swelling ratio and swelling/deswelling rate was determined by the composition of gels. With the increase of Oa-POSS, the swelling ratio decreases slightly, while the swelling rate and deswelling rate increases significantly, which is conducive to the application of this kind of gels.

The Effect of Water-Soluble POSS on the Swelling Behavior of Hybrid PDMAEMA Nanocomposite Hydrogels

2014 ◽  
Vol 1044-1045 ◽  
pp. 145-148
Author(s):  
Yi Chen ◽  
Jun Hong Yang ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng
Keyword(s):  
Radical Polymerization ◽  
Water Soluble ◽  
Swelling Behavior ◽  
Swelling Ratio ◽  
Nanocomposite Hydrogels ◽  
Effect Of Water ◽  
Swelling Rate

The nanosized water-soluble Oa-POSS particles were added into the PDMAEMA hydrogels by in situ radical polymerization. The gels still show obvious temperature and pH double responsiveness. The swelling behavior including swelling ratio and swelling/deswelling rate is determined by the content of added Oa-POSS. With the increase of Oa-POSS, the swelling ratio decreases slightly, while the swelling rate and deswelling rate increases significantly, which is conducive to the application of this kind of gels.

The Mechanical Properties of Inorganic/Organic Co-Crosslinked PDMAEMA Hydrogels

2014 ◽  
Vol 1022 ◽  
pp. 38-41
Author(s):  
Yi Chen ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng ◽  
Jun Hong Yang
Keyword(s):  
Mechanical Properties ◽  
Radical Polymerization ◽  
Compression Strength ◽  
Cross Linker

The nanosized Ov-POSS particles were added into the PDMAEMA hydrogels crosslinked by BIS in situ radical polymerization as a co-crosslinker. Both cross-linker makes a non-ignorable effect on the mechanical properties. With the increase of Ov-POSS, the mechincal properties were improved obviously comparing to the gels only crosslinked by BIS. The increased BIS is also conducive to the enhancement of tensile and compression strength of gels.

Tailoring martensitic transformation and mechanical properties of Ti–Ni composite reinforced by network structure of in-situ TiB and La2O3 phase

Vacuum ◽  
2021 ◽  
Vol 184 ◽  
pp. 109894 ◽  
Author(s):  
Xiaoyang Yi ◽  
Haizhen Wang ◽  
Kuishan Sun ◽  
Guijuan Shen ◽  
Xianglong Meng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Martensitic Transformation ◽  
Network Structure

scholarly journals Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1767
Author(s):  
Yuhong Jiao ◽  
Jianfeng Zhu ◽  
Xuelin Li ◽  
Chunjie Shi ◽  
Bo Lu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Matrix Composite ◽  
Compression Strength ◽  
Casting Process ◽  
Al Alloy ◽  
Pyrolysis Process ◽  
Alloy Matrix ◽  
Al Matrix Composite ◽  
Al Matrix

Al matrix composite, reinforced with the in situ synthesized 3C–SiC, MgAl2O4, and MgO grains, was produced via the casting process using phenolic resin pyrolysis products in flash mode. The contents and microstructure of the composites’ fracture characteristics were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Mechanical properties were tested by universal testing machine. Owing to the strong propulsion formed in turbulent flow in the pyrolysis process, nano-ceramic grains were formed in the resin pyrolysis process and simultaneously were homogeneously scattered in the alloy matrix. Thermodynamic calculation supported that the gas products, as carbon and oxygen sources, had a different chemical activity on in situ growth. In addition, ceramic (3C–SiC, MgAl2O4, and MgO) grains have discrepant contents. Resin pyrolysis in the molten alloy decreased oxide slag but increased pores in the alloy matrix. Tensile strength (142.6 ± 3.5 MPa) had no change due to the cooperative action of increased pores and fine grains; the bending and compression strength was increasing under increased contents of ceramic grains; the maximum bending strength was 378.2 MPa in 1.5% resin-added samples; and the maximum compression strength was 299.4 MPa. Lath-shaped Si was the primary effect factor of mechanical properties. The failure mechanism was controlled by transcrystalline rupture mechanism. We explain that the effects of the ceramic grains formed in the hot process at the condition of the resin exist in mold or other accessory materials. Meanwhile, a novel ceramic-reinforced Al matrix was provided. The organic gas was an excellent source of carbon, nitrogen, and oxygen to in situ ceramic grains in Al alloy.

Formation and properties of nanocomposites made up from solid aspen wood, melamine-urea-formaldehyde, and clay

Holzforschung ◽  
2007 ◽  
Vol 61 (2) ◽  
pp. 148-154 ◽  
Author(s):  
Xiaolin Cai ◽  
Bernard Riedl ◽  
S.Y. Zhang ◽  
Hui Wan
Keyword(s):  
Mechanical Properties ◽  
Ball Mill ◽  
Urea Formaldehyde ◽  
Surface Hardness ◽  
Physical And Mechanical Properties ◽  
Water Soluble ◽  
Aspen Wood ◽  
Wood Polymer ◽  
Density Surface

Abstract Wood polymer nanocomposites were prepared from solid aspen wood, water-soluble melamine-urea-formaldehyde (MUF) resin, and silicate nanoclays. The nanofillers were ground with a ball-mill before being mixed with the MUF resin and impregnated into the wood. The water-soluble prepolymer was mixed with the nanoclays at a mixing speed of 3050 rpm for 20 min to form impregnation solutions. Wood was impregnated with resin, which polymerized in situ under certain conditions. The physical and mechanical properties of the composite and the effect of ball-milling treatment of nanofillers on these properties were investigated. Significant improvements in physical and mechanical properties, such as density, surface hardness, and modulus of elasticity, were obtained for specimens impregnated with MUF resin and nanoclay-MUF resin mixtures. Ball-mill treatment favors dispersion of the nanofillers into the wood, but also appears to interfere with particle-resin adhesion.

PLA-Based Biodegradable Copolyester Nanocomposites: Preparation, Characterization and Mechanical Properties

2011 ◽  
Vol 380 ◽  
pp. 290-293
Author(s):  
Bing Tao Wang ◽  
Ping Zhang ◽  
De Gao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Lactic Acid ◽  
Interfacial Adhesion ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Elongation At Break ◽  
Butylene Terephthalate ◽  
The Matrix ◽  
Different Characteristics

In situ melt copolycondensation was proposed to prepare biodegradable copolyester nanocomposites based on degradable components poly(L-lactic acid) (PLA), rigid segments poly(butylene terephthalate) (PBT), and nanoparticles polyhedral oligomeric silsesquioxanes (POSS). The morphologies and dispersions of two POSS nanoparticles (POSS-NH2 and POSS-PEG) in the copolyester PLABT matrix and their effects on the mechanical properties were investigated. The results demonstrated that the morphologies and dispersions of POSS-NH2 and POSS-PEG showed quite different characteristics. POSS-PEG took better dispersion in the PLABT, while POSS-NH2 had poor dispersions and formed crystalline microaggregates. Due to the good dispersion and strong interfacial adhesion of POSS-PEG with the matrix, the tensile strength and Young’s modulus were greatly improved from 6.4 and 9.6 MPa for neat PLABT up to 11.2 and 70.7 MPa for PLABT/POSS-PEG nanocomposite. Moreover, the incorporation of POSS-PEG could impart macromolecular chains good flexibility and improve the mobility of the chains, so the the elongation at break of PLABT/POSS-PEG nanocomposite dramatically increased from 190 to 350 % compared with neat PLABT.

The Effect of Polymerization Mode on the POSS Hybrid PVA Hydrogels

2014 ◽  
Vol 1044-1045 ◽  
pp. 137-140
Author(s):  
Yi Chen ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng ◽  
Jun Hong Yang
Keyword(s):  
Freezing Temperature ◽  
Water Soluble ◽  
Hybrid Nanocomposite ◽  
Elongation At Break ◽  
Cycle Times ◽  
Freeze Thaw ◽  
Nanocomposite Hydrogels ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle ◽  
Lower Temperature

A novel POSS hybrid nanocomposite hydrogels was synthesized by introducing water-soluble Oa-POSS into the PVA hydrogels by freeze-draw mode. The freezing temperature and freeze-thaw cycle times affected the mechanical properties of gels. When polymerizing at lower temperature, the tensile strength and modulus increases and the elongation at break decreases obviously. Meantime, with the increase of freeze-thaw cycle times, the strength, modulus and elongation at break all improved gradually.

Mechanically strong and stretchable polyurethane–urea supramolecular hydrogel using water as an additional in situ chain extender

RSC Advances ◽  
2014 ◽  
Vol 4 (46) ◽  
pp. 24095-24102 ◽  
Author(s):  
Chao Deng ◽  
Yulin Cui ◽  
Tingting Zhao ◽  
Mei Tan ◽  
He Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Modulus ◽  
Chain Extender ◽  
Compression Stress ◽  
Supramolecular Hydrogel ◽  
Elongation At Break

Polyurethane–urea supramolecular hydrogel with excellent mechanical and processible properties is developed. The mechanical properties including shear modulus, elongation at break, tensile strength and compression stress can be adjusted by altering the diisocyanate content.

Sign in / Sign up

Export Citation Format

Share Document