Synthesis of Y-shaped amphiphilic copolymers by macromolecular azo coupling reaction

Wang, Jilei; Zhou, Yuqi; Wang, Xiaogong; He, Yaning

doi:10.1039/c4ra14926b

Cited by 29 publications

(29 citation statements)

References 41 publications

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“…[1][2][3] Bifunctional diglycidyl ester of bisphenol A (DGEBA) based epoxy resins, are often utilized for semiconductor encapsulation in EE applications. [5][6][7][8][9][10][11][12][13][14][15][16][17] Generally, phosphorous containing flame retardants (P-FRs) are always regarded as one of the best choices to reduce flammability of epoxy resin since lots of halogenated flame retardants (H-FRs) are forbidden owing to their serious hazards for environment and human. Nevertheless, the intrinsic flammability of DGEBA/DDS is one of challenges for their products.…”

Section: Introductionmentioning

confidence: 99%

Impact of halogen-free flame retardant with varied phosphorus chemical surrounding on the properties of diglycidyl ether of bisphenol-A type epoxy resin: synthesis, fire behaviour, flame-retardant mechanism and mechanical properties

et al. 2016

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This work aimed to investigate the effect of two types of phosphorus-containing flame retardants (P-FRs) with different chemical surroundings (phenylphosphonate-based (PO-Ph) and phenylphosphoric-based (PO-OPh)) on the flameretardant efficiency for diglycidyl ester of bisphenol-A type epoxy (EP) resin. The two series of P-FRs which were named as FPx and FPOx (x=1, 2 and 3), respectively, showed reactivity with epoxy group that was examined by differential scanning calorimetric (DSC) and variable temperatures FTIR spectrum (VT-FTIR). A comparative study between the FPx and FPOx (x=1, 2 and 3) contaning flame-retardamt epoxy was carried out via investigating their flammability, thermal stability and mechanical properties. The most significant difference on flame retardancy between them was that FPx (x=1, 2 and 3) endowed EP with V-0 rating in UL 94 test at 5 wt% loading, while FPOx (x=1, 2 and 3) showed no rating at such loading. Importantly, it is found that there was almost 10 times difference in the flame-retardant efficiency for epoxy resin between FPx and FPOx, though they had similar chemically molecular structures. Moreover, TGA-FTIR and TGA-MS coupling techniques (TGA, thermalgravimetric analysis; MS, mass spectroscopy) were employed to study the thermal decomposition of FP1 and FPO1; the impacts of FP1 and FPO1 on the thermal decomposition of EP were studied by TGA-FTIR as well. Furthermore, an online temperature detection experiment was designed to collect the temperatures by thermocouple and infrared thermometers, respectively in the UL 94 test. Based on the above results, the flame-retardant mechanisms of FP1 and FPO1 in EP were discussed. In addition, the impact of P-FRs on mechanical properties of EP was studied by means of tensile test and dynamic mechanical analysis .

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Section: Introductionmentioning

confidence: 99%

Impact of halogen-free flame retardant with varied phosphorus chemical surrounding on the properties of diglycidyl ether of bisphenol-A type epoxy resin: synthesis, fire behaviour, flame-retardant mechanism and mechanical properties

et al. 2016

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“…27 A very feasible way to prepare colloidal particle is through the self-assembly of amphiphilic polymers in selected solvents, which can be potentially used in drug delivery systems, nanoreactors, photonic bandgap (PBG) crystals and others. [28][29][30][31][32][33][34][35][36][37][38][39][40] In recent years, the effort to produce nonspherical colloids from spherical colloids has aroused significant interest, which can be potential used in photonic band gap (PBG) crystals and others.…”

Section: Introductionmentioning

confidence: 99%

Fast Photoinduced Large Deformation of Colloidal Spheres from a Novel 4-arm Azobenzene Compound

Wang

Zhou

et al. 2015

ACS Appl. Mater. Interfaces

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A novel 4-arm shaped amphiphilic azobenzene compound was synthesized. The tetraphenylethylene (TPE) core precursor was prepared and further modified by azo coupling reaction at the four peripheral groups. Colloidal spheres could be directly prepared by self-assembly of the prepared amphiphilic azobenzene compound in selective solvents (THF/H2O), which were characterized by using transmission electron microscopy. The colloid diameters could be controlled by adjusting the initial compound concentration and water-adding rate in the preparation processes. By irradiation with visible linearly polarized LED light (450 nm), fast photoinduced deformation of the colloidal spheres along the polarization direction was observed. A very large deformation degree (l/d > 4) could be easily obtained.

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“…In addition, resulting from the high efficiency of the azocoupling reaction, azo polymers containing different pushpull azo chromophores can be easily obtained [43][44][45][46]. As a result, the relationship between the structure and the dielectric properties of the azo polymers can be systematically investigated.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Azo Polymers: Effect of the Push-Pull Azo Chromophores

Zhang

Wen

Zhang

et al. 2018

International Journal of Polymer Science

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The relationship between the structure and the dielectric properties of the azo polymers was studied. Four azo polymers were synthesized through the azo-coupling reaction between the same precursor (PAZ) and diazonium salts of 4-aminobenzoic acid ethyl ester, 4-aminobenzonitrile, 4-nitroaniline, and 2-amino-5-nitrothiazole, respectively. The precursor and azo polymers were characterized by 1 H NMR, FT-IR, UV-vis, GPC, and DSC. The dielectric constant and dielectric loss of the samples were measured in the frequency range of 100 Hz-200 kHz. Due to the existence of the azo chromophores, the dielectric constant of the azo polymers increases compared with that of the precursor. In addition, the dielectric constant of the azo polymers increases with the increase of the polarity of the azo chromophores. A random copolymer (PAZ-NT-PAZ) composed of the azo polymer PAZ-NT and the precursor PAZ was also prepared to investigate the content of the azo chromophores on the dielectric properties of the azo polymers. It showed that the dielectric constant increases with the increase of the azo chromophores. The results show that the dielectric constant of this kind of azo polymers can be controlled by changing the structures and contents of azo chromophores during the preparation process.

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Synthesis of Y-shaped amphiphilic copolymers by macromolecular azo coupling reaction

Cited by 29 publications

References 41 publications

Impact of halogen-free flame retardant with varied phosphorus chemical surrounding on the properties of diglycidyl ether of bisphenol-A type epoxy resin: synthesis, fire behaviour, flame-retardant mechanism and mechanical properties

Impact of halogen-free flame retardant with varied phosphorus chemical surrounding on the properties of diglycidyl ether of bisphenol-A type epoxy resin: synthesis, fire behaviour, flame-retardant mechanism and mechanical properties

Fast Photoinduced Large Deformation of Colloidal Spheres from a Novel 4-arm Azobenzene Compound

Dielectric Properties of Azo Polymers: Effect of the Push-Pull Azo Chromophores

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