A5069688346- Polymer crystallization and properties
- biodegradable polymer synthesis and properties
- Polymer Nanocomposites and Properties
- Epoxy Resin Curing Processes
- Synthesis and properties of polymers
- Polymer composites and self-healing
- Injection Molding Process and Properties
- Natural Fiber Reinforced Composites
- Fiber-reinforced polymer composites
- Microplastics and Plastic Pollution
- Conducting polymers and applications
- Photopolymerization techniques and applications
- Material Properties and Processing
- Advanced Sensor and Energy Harvesting Materials
- Multicomponent Synthesis of Heterocycles
- Organoboron and organosilicon chemistry
- Mesoporous Materials and Catalysis
- Dendrimers and Hyperbranched Polymers
- Organometallic Complex Synthesis and Catalysis
- Carbon dioxide utilization in catalysis
- Mineralogy and Gemology Studies
- Luminescence and Fluorescent Materials
- Silicone and Siloxane Chemistry
- Microwave-Assisted Synthesis and Applications
- Supramolecular Self-Assembly in Materials
Hebei University
2014-2024
Baoding University
2020
Beijing University of Chemical Technology
2004-2007
In the present study, we propose and develop a flexible pressure sensor based on piezoresistive effect of multilayer graphene films polyester textile. The response results from deformation conductive network structure changes in resistance. Here, show that can achieve sensitivity value 0.012 kPa − 1 , measurement range be as high 800 kPa, time reach to 50 ms. Subsequently, stable in-shoe wireless plantar system is developed dynamic distribution acquired real-time. Overall, textile has...
This paper describes the development of a graphene-based dry flexible electrocardiography (ECG) electrode and portable wireless ECG measurement system. First, graphene films on polyethylene terephthalate (PET) substrates were used to construct electrode. Then, textile was synthesized for fabrication wearable monitoring The structure electrical properties electrodes evaluated using Raman spectroscopy, scanning electron microscopy (SEM), alternating current impedance spectroscopy. signals then...
The liquid crystalline phase behavior and sol-gel transition in halloysite nanotubes (HNTs) aqueous dispersions have been investigated by applying polarized optical microscopy (POM), macroscopic observation, rheometer, small-angle X-ray scattering, scanning electron microscopy, transmission microscopy. starts to form at the HNT concentration of 1 wt %, a full forms 25 % as observed POM observation. Rheological measurements indicate typical shear flow for with concentrations above 20 further...
Abstract Stereoselective polymerization of polar vinyl monomers has been a long‐standing challenge because the employed transition‐metal catalysts are easily poisoned by groups monomers. In this contribution, series β ‐diketiminato rare‐earth metal complexes 1 – 5 (L 1–5 Ln(CH 2 SiMe 3 ) (THF) n , Ln=Gd–Lu, Y, and Sc) were successfully synthesized. combination with Al i Bu [Ph C][B(C 6 F 4 ], c (Tb)– g (Tm) exhibited high activities excellent isoselectivities for ortho ‐methoxystyrene ( o...
Abstract The crystal morphology and nonisothermal crystallization kinetics of short carbon fiber/poly(trimethylene terephthalate) (SCF/PTT) composites were investigated by polarized optical microscopy (POM) differential scanning calorimetry (DSC). micrographs suggest that the more content SCF in composites, smaller size spherulites is. Moreover, addition can lead to forming banded composites. Avrami equation modified Jeziorny, Ozawa theory method developed Mo used, respectively, fit primary...
Abstract The melting, crystallization behaviors, and nonisothermal kinetics of the ternary blends composed poly(ethylene terephthalate), poly(trimethylene terephthalate) (PTT) poly(buthylene (PBT) were studied with differential scanning calorimeter (DSC). PBT content in all was settled invariably to be one‐third, which improved melt‐crystallization temperature blends. All blend compositions amorphous state miscible as evidenced by a single, composition‐dependent glass transition ( T g )...
Abstract The isothermal crystallization and subsequent melting behavior of poly(trimethylene terephthalate) (PTT) composites filled with nano‐CaCO 3 were investigated at designated temperatures differential scanning calorimetry. Avrami equation was used to fit the crystallization. exponents determined be 2–3 for neat PTT PTT/CaCO composites. particles , acting as nucleating agents in composites, accelerated rate, half‐time decreasing or growth rate constant (involving both nucleation...
A series of poly(trimethylene terephthalate)- b -poly(tetramethylene glycol) (PTT-PTMEG) copolymers were synthesized by two-step melt-polycondensation. The characterized using Fourier transform infrared spectroscopy (FTIR), 1 H NMR spectroscopy, rheometer, differential scanning calorimetry (DSC), polarized optical microscopy (POM), thermal gravimetric analysis (TGA), and mechanical properties. results suggest that increasing the flexible PTMEG contents from 0% to 60 wt%, show decreased glass...
ABSTRACT Four siloxane‐containing benzoxazine monomers and telechelic oligomers were synthesized from 1,3‐bis(3‐aminopropyl)‐1,1,3,3‐tetramethyldisiloxane, α,ω‐bis(3‐aminopropyl)polydimethylsiloxane, phenol, o ‐allylphenol, formaldehyde. The length of the siloxane segment affects polymerization reaction oligomers. dynamic mechanical properties corresponding polybenzoxazines depend primarily on structure phenol segment. exhibit one‐way dual‐shape memory behavior in response to changes...
A siloxane-containing diphenol is synthesized from 1,1,3,3-tetramethyldisiloxane and o-allylphenol, followed by the Mannich condensation with aniline, methylamine, formaldehyde yielding two benzoxazines. The onset polymerization temperature of aniline-based benzoxazine higher than that methylamine counterpart. dynamic mechanical properties polybenzoxazines depend on structure starting primary amines. Both exhibit one-way dual-shape memory behavior in response to changes temperature, they...
Abstract The isothermal crystallization and crystal morphology of poly(trimethylene terephthalate) (PTT)/poly (ethylene 2,6‐naphthalate) (PEN) blends were investigated with differential scanning calorimetry polarized optical microscopy. commonly used Avrami equation was to fit the primary stage crystallization. exponents evaluated be in range 3.0–3.3 for subsequent melting endotherms after showed multiple peaks. activation energies 20 or 40% PTT −48.3 −60.9 kJ/mol, respectively, as...