Highly Reliable BaTiO 3 ‐Polyphenylene Oxide Nanocomposite Dielectrics via Cold Sintering

2021 ◽  
Vol 8 (18) ◽  
pp. 2100963
Author(s):  
Takao Sada ◽  
Kosuke Tsuji ◽  
Arnaud Ndayishimiye ◽  
Zhongming Fan ◽  
Yoshihiro Fujioka ◽  
...  
Keyword(s):  
Polyphenylene Oxide

scholarly journals Improved Processing and Properties for Polyphenylene Oxide Modified by Diallyl Orthophthalate Prepolymer

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2016
Author(s):  
Honghua Wang ◽  
Qilin Mei ◽  
Yujie Ding ◽  
Zhixiong Huang ◽  
Minxian Shi
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Phase Separation ◽  
Dilution Effect ◽  
Gradual Decrease ◽  
Gel Point ◽  
Dynamic Mode ◽  
Curing Process ◽  
Scanning Calorimetry ◽  
Polyphenylene Oxide

Diallyl orthophthalate (DAOP) prepolymer was investigated as a reactive plasticizer to improve the processability of thermoplastics. The rheology of blends of DAOP prepolymer initiated by 2,3-dimethyl-2,3-diphenylbutane (DMDPB) and polyphenylene oxide (PPO) was monitored during the curing process, and their thermal properties and morphology in separated phases were also studied. Differential scanning calorimetry (DSC) results showed that the cure degree of the reactively plasticized DAOP prepolymer was reduced with increasing PPO due to the dilution effect. The increasing amount of the DAOP prepolymer led to a gradual decrease in the viscosity of the blends and the rheology behavior was consistent with the chemical gelation of DAOP prepolymer in blends. This indicated that the addition of the DAOP prepolymer effectively improved processability. The phase separation occurring during curing of the blend and the transition from the static to dynamic mode significantly influences the development of the morphology of the blend corresponding to limited evolution of the conversion around the gel point.

Effect of Triaryl Phosphate, Zinc and Zinc Borate on Fire Properties of High Impact Polystyrene and High Impact Polystyrene-Polyphenylene Oxide Blend (Modified-Polyphenylene Oxide

1994 ◽  
Vol 12 (6) ◽  
pp. 529-550 ◽  
Author(s):  
Ramazan Benrashid ◽  
Gordon L. Nelson ◽  
Donald J. Ferm
Keyword(s):  
Flame Retardancy ◽  
High Impact ◽  
Zinc Borate ◽  
Polyphenylene Oxide ◽  
High Impact Polystyrene ◽  
Smoke Generation ◽  
Flame Retarded ◽  
Rate Of Heat Release ◽  
Fire Properties ◽  
Phase Activity

Samples of m-PPO (virgin and flame retarded) and high impact polystyrene blended with zinc and zinc borate (2ZnO·3B2O3·3.5H 2O), were pre pared. The effect of triaryl phosphate on the flame retardancy of PPO-HIPS in conjunction with zinc and zinc borate was studied. For polystyrene zinc borate shows some reduction in smoke generation. Zinc, however does not show any effect on smoke generation for high impact polystyrene. Triphenyl phosphate shows minimal flame retardancy in HIPS which is not enhanced by zinc. Addition of zinc gives an increase in oxygen index for FR m-PPO, whereas zinc borate decreases the OI values. Zinc borate may sequester triaryl phos phate and thus eliminate its vapor phase activity. Zinc borate shows a signifi cant reduction in smoke generation and rate of heat release for m-PPO.

Flame-Retardant Performance of Polystyrene Enhanced by Polyphenylene Oxide and Intumescent Flame Retardant

2014 ◽  
Vol 53 (4) ◽  
pp. 395-402 ◽  
Author(s):  
Hong Yan ◽  
Bo Dong ◽  
Xiangxiang Du ◽  
Senyuan Ma ◽  
Liqiao Wei ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Intumescent Flame Retardant ◽  
Polyphenylene Oxide

Fracture Properties of Glass Filled Polyphenylene Oxide Composites

1968 ◽  
Vol 2 (3) ◽  
pp. 266-283 ◽  
Author(s):  
A. Wambach ◽  
K. Trachte ◽  
A. Dibenedetto
Keyword(s):  
Fracture Properties ◽  
Polyphenylene Oxide ◽  
Oxide Composites

scholarly journals Utilising polyphenylene oxide for high exposure solar UVA dosimetry

2008 ◽  
Vol 8 (10) ◽  
pp. 2759-2762 ◽  
Author(s):  
D. J. Turnbull ◽  
P. W. Schouten
Keyword(s):  
Thin Film ◽  
Solar Spectrum ◽  
Combined System ◽  
High Exposure ◽  
Optical Absorbance ◽  
Preliminary Results ◽  
Polyphenylene Oxide ◽  
Film Form ◽  
Uncertainty Level ◽  
Uva Radiation

Abstract. A personal UV dosimeter that can quantitatively assess high exposure solar UVA exposures has been developed. The chemical polyphenylene oxide has been previously reported on its ability to measure high UVB exposures. This current research has found that polyphenylene oxide, cast in thin film form, is responsive to both the UVA and UVB parts of the solar spectrum. Further to this, the UVB wavelengths were filtered out with the use of mylar. This combined system responded to the UVA wavelengths only and underwent a change in optical absorbance as a result of UVA exposure. Preliminary results indicate that this UVA dosimeter saturates steadily when exposed to sunlight and can measure exposures of more than 20 MJ/m2 of solar UVA radiation with an uncertainty level of no more than ±5%.

Interlaminar Fracture in Carbon Fiber/Thermoplastic Composites

1989 ◽  
Vol 170 ◽  
Author(s):  
J. A. Hinkley ◽  
W. D. Bascom ◽  
R. E. Allred
Keyword(s):  
Fracture Toughness ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
High Strain ◽  
Thermoplastic Composites ◽  
Plasma Modification ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Polyphenylene Oxide ◽  
Commercial Carbon

AbstractThe surfaces of commercial carbon fibers are generally chemically cleaned or oxidized and then coated with an oligomeric sizing to optimize their adhesion to epoxy matrix resins. Evidence from fractography, from embedded fiber testing and from fracture energies suggests that these standard treatments are relatively ineffective for thermoplastic matrices. This evidence is reviewed and model thermoplastic composites (polyphenylene oxide/high strain carbon fibers) are used to demonstrate how differences in adhesion can lead to a two-fold change in interlaminar fracture toughness.The potential for improved adhesion via plasma modification of fiber surfaces is discussed. Finally, a surprising case of fiber-catalyzed resin degradation is described.

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