A5101465348- Chemical Thermodynamics and Molecular Structure
- Energetic Materials and Combustion
- biodegradable polymer synthesis and properties
- Thermal and Kinetic Analysis
- Carbon dioxide utilization in catalysis
- Polymer composites and self-healing
- Advanced Polymer Synthesis and Characterization
- Meat and Animal Product Quality
- Proteins in Food Systems
- Surfactants and Colloidal Systems
- Enhanced Oil Recovery Techniques
- Petroleum Processing and Analysis
- Groundwater flow and contamination studies
- Organometallic Complex Synthesis and Catalysis
- Advanced battery technologies research
- Electrospun Nanofibers in Biomedical Applications
- Ionic liquids properties and applications
- Rocket and propulsion systems research
- Chemical Synthesis and Reactions
- Electrocatalysts for Energy Conversion
- Protein Hydrolysis and Bioactive Peptides
- Chemical Reactions and Mechanisms
- Marine Biology and Environmental Chemistry
- Chemical and Physical Properties in Aqueous Solutions
- Microencapsulation and Drying Processes
Northeast Agricultural University
2023-2024
Tongji University
2021-2024
University of Jinan
2024
Nanjing University of Science and Technology
2021-2024
Jilin University
2022-2023
Shaanxi Normal University
2007-2016
Wuhan University of Technology
2013
National University of Singapore
2009-2012
Beijing Institute of Technology
2011
Xiaomi (China)
2006
Novel biodegradable star poly(ester−urethanes) containing three-arm poly(ε-caprolactone) (PCL) as switching segment were prepared shape-memory polymers (SMPs) with temperature (Ts) around body temperature. PCL-triols molecular weight (Mn) of 2700−4200 g/mol and Tm 45−47 °C synthesized in 55−67% yield by Novozym 435-catalyzed ring-opening polymerization ε-caprolactone glycerol initiator, their structures confirmed 1H 13C NMR analysis. Reaction the methylene diphenyl 4,4′-diisocyanate...
Polyurethanes are widely used polymeric materials, but they rarely biorenewable and degradable. Although some previously reported bio-based polyurethanes exhibit good thermal mechanical properties, their bio-content is usually low, resulting from the only replacement of diol monomer instead whole diol/diisocyanate pairs. In addition, traditional often difficult to degrade, leading environmental issues. To address these issues, we propose a solution by sourcing both diols isocyanates...
Based on the data of remote sensing images from Landsat in 1995 and 2015, this paper used principal component analysis (PCA) method to determine weights four ecological indexes (greenness, dryness, wetness heat), then selected a evaluation model based index (RSEI) monitor analyze environment quality Weinan City 2015. The results showed that mean values RSEI increased 0.489 0.556 during 1995-2015, which indicated qua-lity had been improved. improved area was mainly distributed central its...
Elastic shape-memory polymers as self-expendable polymeric drug-eluting stents are developed for the first time, with good mechanical properties, fast self-expansion, and sustained drug release. Novel star block co-polymer PCTOPDs containing hyperbranched poly(ε-caprolactone) (PCL) switching segment poly(2-oxepane-1,5-dione) (POPD) hard were synthesized in high yield characterized by NMR, GPC, DSC, tensile test cyclic thermomechanical test. PCTOPD 15–27 wt% POPD (PCTOPD-15–27) found to be...
The precise synthesis of multifunctional block copolymers with tailored architectures remains a pivotal challenge in polymer chemistry, particularly when balancing chemoselectivity and stereoselectivity within single catalytic system. To address...
Enzyme-catalyzed polycondensation for the synthesis of block copolymers was reported first time. Thermoplastic copolyesters containing poly[(R)-3-hydroxybutyrate] (PHB) and poly[(R)-3-hydroxyoctanoate] (PHO) blocks were enzymatically prepared by one- or two-step lipase-catalyzed polycondensation. Novozym 435-catalyzed reaction PHB-diol (Mn 3100 g/mol, GPC), PHO-diol 3200 divinyl adipate gave poly(HB-co-HO) 9800 GPC) with randomly arranged in 55% yield. In polycondensations, afforded 73% PHB...
Tishchenko reaction represents a highly atom-efficient method for synthesizing esters via aldehydes disproportionation, which holds significant promise in sustainable chemistry polymerizing biorenewable dialdehydes into polyesters. However, previous polymerization attempts merely yielded oligomers with very low molecular weights due to intramolecular cyclization. To address this important challenge, we propose an efficient approach leverage catalytic steric hindrance achieve higher weights....
A method for estimating critical temperature (T b) of thermal explosion energetic materials was derived from Semenov's [9 Semenov , N. 1958 . On Some Problems Chemical Kinetics and Reactivity Moscow : Ind AN SSSR [Google Scholar]] theory the nonisothermal kinetic equation based on Berthelot's expression using reasonable hypotheses. The final formula is which simple. We can easily obtain onset ei) DSC curves, value T e0 values b then calculate b. result obtained with this coincides completely...
The self-accelerating decomposition temperature (TSADT), critical of thermal explosion (Tb), adiabatic time to (tTIad), 50% drop height impact sensitivity (H50), hot spot initiation caused by (Tcr,hotspot), safety degree (Sd), ambient (Tacr), and probability (PTE) the gun propellant composed triethyleneglycol dinitrate (TEGDN), nitroglycerin (NG), nitrocellulose (NC) were studied. results evaluation on obtained: (1) T00 = 433.4 K, TSADT Te0 441.1 Tb Tbp0 468.4 K; (2) when Ek 205.3 × 103 J...
Novozym 435-catalyzed ring-opening polymerization (ROP) of trimethylene carbonate (TMC) with telechelic hydroxylated poly[(R)-3-hydroxybutyrate] [PHB-diol; Mn = 3000 g/mol (GPC)] as initiator gave di-block poly(HB-co-TMC) different weight percents the blocks and 4400–8700 (GPC) in 54–89% yield, being first enzymatic preparation block poly(ester-co-carbonate). The generality novel method was demonstrated by ROP TMC poly(ε-caprolactone)-diol [PCL-diol; 4200 to give A–B–A...
An easily accessible and cost-effective catalytic system, TU/PPNCl, was developed to produce sequence-controlled multiblock polyesters by self-switchable polymerization from a monomer mixture of epoxides, anhydrides, cyclic esters.