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Emulsifier-Free Synthesis of Crosslinkable ABA Triblock Copolymer Nanoparticles via AGET ATRP
Chuanjie Cheng,Liang Shen,Quanlei Fu,Zhongbin Liu,Yongluo Qiao,Changqing Fu 한국고분자학회 2011 Macromolecular Research Vol.19 No.10
A crosslinkable ABA triblock copolymer was synthesized from allylic methacrylate (AMA) monomer using a poly(ethylene oxide)-based macromolecule as both an initiator and emulsifier. The “two-step” controlled/living radical polymerization can be conducted via activator generated by electron transfer (AGET) atom transfer radical polymerization (ATRP). Cheap and commercially available N,N-dimethyldodecylamine (DMDA) was found to be a good ligand for the AGET ATRP reaction. The linear ABA triblock copolymer that contains pendent allylic groups can undergo crosslinking under UV irradiation conditions, which indicates that the environmentally friendly method has potential applications in UV curing coatings and UV curing inks, etc..
Chuanjie Wang,Shaoxi Xue,Gang Chen,Peng Zhang 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.2
In micro-scaled plastic deformation, material strength and ductile fracture behaviors of thin sheet in tensionare quite different from those in macro-scale. In this study, uniaxial tensile tests of Monel 400 thin sheets withdifferent microstructures were carried out to investigate the plastic deformation size effect in micro-scale. Theexperimental results indicate that the flow stress and fracture strain departure from the traditional empirical formulawhen there are only fewer grains across the thickness. And the number of dimples on the fracture surface isgetting smaller with the decreasing ratio of specimen thickness to grain size. Then, a constitutive model basedon dislocation density considering the free surface effect in micro-scale is proposed to reveal the mechanism ofthe flow stress size effect. In addition, a model is proposed considering the surface roughening inducing thethickness nonuniform and the decrease of micro-voids resulting from the reduction of grain boundary densitywith the decreasing ratio of specimen thickness to grain size. The interactive effects of the surface rougheningand the decrease of micro-voids result in the earlier fracture in micro tension of the specimen with fewergrains across the thickness
Chuanjie Cheng,Xiongxiong Bai,Xu Zhang,Ming Chen,Qinghua Huang,Zhongyu Hu,Yuanming Tu 한국고분자학회 2014 Macromolecular Research Vol.22 No.12
An azido- and bromo-containing compound derived from naturally occurring ethyl cinnamate was usedsuccessfully to prepare block copolymers by a combination of ‘activator generated by electron transfer atom transferradical polymerization’ (AGET ATRP) and Huisgen “click” reactions in emulsion. First, azido-end poly(methyl methacrylate)and alkyne-end polystyrene were prepared under AGET ATRP conditions, then, poly(methyl methacrylate) blockpolystyrene (PMMA-b-PS) diblock copolymer was formed by Huisgen 1,3-dipolar cycloaddition. Finally, polystyreneblock poly(methyl methacrylate) block polystyrene (PS-b-PMMA-b-PS) triblock copolymer was synthesizedvia simultaneous AGET ATRP and click reactions, catalyzed by the same copper-based catalyst. The polymers werecharacterized by 1H nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC),which confirmed the successful synthesis of the corresponding polymers.
Duan, Chuanjie,Zhang, Shuhua The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.-
This work mainly focuses on determination of the fully plastic J-integral solutions for welded center cracked plates subjected to remote tension loading. Detailed three-dimensional elasticeplastic Finite Element Analyses (FEA) were implemented to compute the fully plastic J-integral along the crack front for a wide range of crack geometries, material properties and weld strength mismatch ratios for 900 cases. According to the database generated from FEA, Back-propagation Neural Network (BPNN) model was proposed to predict the values and distributions of fully plastic J-integral along crack front based on the variables used in FEA. The determination coefficient R2 is greater than 0.99, indicating the robustness and goodness of fit of the developed BPNN model. The network model can accurately and efficiently predict the elastic-plastic J-integral for weld centerline crack, which can be used to perform fracture analyses and safety assessment for welded center cracked plates with varying strength mismatch conditions under uniaxial loading.
Duan, Chuanjie,Zhang, Shuhua The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1
This work mainly focuses on determination of the fully plastic J-integral solutions for welded center cracked plates subjected to remote tension loading. Detailed three-dimensional elasticeplastic Finite Element Analyses (FEA) were implemented to compute the fully plastic J-integral along the crack front for a wide range of crack geometries, material properties and weld strength mismatch ratios for 900 cases. According to the database generated from FEA, Back-propagation Neural Network (BPNN) model was proposed to predict the values and distributions of fully plastic J-integral along crack front based on the variables used in FEA. The determination coefficient R2 is greater than 0.99, indicating the robustness and goodness of fit of the developed BPNN model. The network model can accurately and efficiently predict the elastic-plastic J-integral for weld centerline crack, which can be used to perform fracture analyses and safety assessment for welded center cracked plates with varying strength mismatch conditions under uniaxial loading.
Large-scale microwave-assisted ring-opening polymerization of e-caprolactone
Qi Xu,Chuanjie Zhang,Shaojun Cai,Lijian Liu,Ping Zhu 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.5
To probe into the industrialization possibility of microwave-assisted ring-opening polymerization (ROP)of e-caprolactone (e-CL), it was performed with monomer mass from 750 to 2450 g using a self-designed industrial microwave oven (6000W) catalyzed by stannous octanoate (Sn(Oct)2) (M/Cat = 1000). The large-scale ROP of e-CL proceeded smoothly at various microwave power levels (850, 1700, and 2550 W)and produced poly(e-caprolactone) (PCL) with weight-average molar mass (Mw) from 66,000 to 12,2000 g/mol within 40 min in a yield over 93%. The structure of PCL was characterized by 1H and 13C NMR, FT-IR, DSC and WAXD. We propose that the microwave ROP of e-CL is a potential technology to prepare PCL commercially. 2010 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
Effect of Heat Treatments on Microstructures and Tensile Properties of Cu–3 wt%Ag–0.5 wt%Zr Alloy
Gang Chen,ChuanJie Wang,Ying Zhang,Cen Yi,Peng Zhang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.2
The microstructures and tensile properties of Cu–3 wt%Ag–0.5 wt%Zr alloy sheets under different aging treatments areinvestigated in this research. As one kind of precipitate, Ag nanoparticles with coherent orientation relationship with matrixprecipitate. However, after the peak-age point, most of Ag nanoparticles grow into short rod shape with the interface translatingto semi-coherent, which leads to the lower strength of over-aging sample. The yield strength is estimated by consideringsolid solute, grain boundary and precipitation strengthening mechanisms. The result shows that the Ag precipitates providethe main strengthening role. Then a constitutive equation representing the evolution of dislocation density with plastic strainis built by considering work-hardening behavior coming from shearable and non-shearable precipitates which is mainly theparticles containing Zr. The flow stress contributed by shearable particle hardening is higher than that of non-shearable one. Due to the coarsening of grain boundary precipitates and low rate of damage accumulation of these non-shearable particles,the micro-cracks nucleate easily at grain boundary which leads to intergranular fracture.
Eco-friendly Polypyrrole-coated Cocozelle Composites for Supercapacitor Application
Hui Ji,Chuanjie Zhang,Weida Rao,Bin Guo,Lingling Fan,Zikui Bai,Haifeng Bao,Jie Xu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
Cocozelle is essentially consisted of hemicellulose and lignin with a hierarchically porous structure. Herein,cocozelle slices after freeze-drying were employed as green substrates to support the growth of polypyrrole (PPy) via a facileoxidative polymerization approach. The cocozelle surface was densely covered with sheet-like PPy due to the hydrogenbonding between PPy and cocozelle. The PPy/cocozelle composites could be facilely utilized as supercapacitor electrodes,which showed a high specific capacitance of 1108 F g-1 with an energy density of 70.5 Wh kg-1 and a power density of398 W kg-1 at a charge/discharge current density of 0.8 mA cm-2 as well as desirable cycling life with a capacitance retentionrate of 76.9 % after 1000 cycles. Moreover, 95.3 % of the initial specific capacitance obtained at 0.2 mA cm-2 could bereached as the current density increased to 1.6 mA cm-2. These results demonstrate that cocozelle could be used as a superioralternative biomass-derived substrate for the developments of eco-friendly and renewable energy storage devices.