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1. Studies on thermal stability, dielectric and dynamic mechanical properties of functionalized kaolin reinforced epoxy composites | |||
Liu Xin,He Aixiao,Guo Jinshan | |||
Chemistry 02 March 2017 | |||
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Abstract: To improve the compatibility and dispersion stability of kaolin (K) in epoxy matrix, oligomeric epoxy was employed to modify K by a simple dry-method. After modification, epoxy resin was successfully grafted on the surface of K through chemical bonds, and the grafting rate was as high as 21.65 wt%. The contact angle of EP-K (101.28 ) was much higher than that of the pristine K (12.65 ). It was proved that the hydrophobic nature of organically modified K was improved significantly. Compared with the raw K, SEM demonstrated that the EP-K exhibited a homogeneous dispersion in organic solvent or in epoxy matrix. The EP-K /EP composites fabricated by solvent-free method possessed improved thermal stability and significant improvement on storage modulus. Due to the excellent insulation of K and the homogeneous dispersion, the dielectric constant of composites was lower than neat epoxy with the EP-K≤30 wt%. Compared with the non-modified K composite, the modification of K on permittivity of the composite was encouraged. However, all of the EP-K/EP composites still maintained a good insulating property. Hence the material developed in this work could be explored for a possible high performance and industrial application as microelectronic encapsulation material. | |||
TO cite this article:Liu Xin,He Aixiao,Guo Jinshan. Studies on thermal stability, dielectric and dynamic mechanical properties of functionalized kaolin reinforced epoxy composites[OL].[ 2 March 2017] http://en.paper.edu.cn/en_releasepaper/content/4720463 |
2. A high antibacterial N-halamine cotton fabric synthesized via mist polymerization | |||
Guangyan Luo,Guanghui Xi,Xiyi Wang,Dandan Qin,Yanyan Zhang,Feiya Fu,Xiangdong Liu | |||
Chemistry 31 May 2016 | |||
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Abstract:An N-halamine monomer, 3-methylallyloxy-5,5-dimethylhydantoin (MH) was synthesized by 5,5-dimethylhydantoin (DMH) and methacryloyl chloride. Antimicrobial coating of poly[1-methyl-1-(4,4-dimethyl-2,5-dioxoimidazolidin-carbonyl)ethylene] (PMH) were prepared on pristine cotton fabrics via a "mist polymerization" process using MH as monomer. The coating endowed the cotton fabric with effective antibacterial function and remarkable antibacterial durability. In the antibacterial tests, the bacteriostatic reduction rate against both Escherichia coli and Staphylococcus aureus is greater than 99.78%, and can be maintained over 99.00% even after 30 cycles washing. Compared with other antimicrobial technologies, mist polymerization offers advantages such as, achieving antimicrobial function by small consumption of monomer, forming coatings on single-side of the fabrics, and minimizing the damages on the original properties of cotton during the finishing process. It has potential applications in a wide variety of fields such as sportswear, socks, underwear, and medical textile. | |||
TO cite this article:Guangyan Luo,Guanghui Xi,Xiyi Wang, et al. A high antibacterial N-halamine cotton fabric synthesized via mist polymerization[OL].[31 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4689022 |
3. Self-Assembling of Single Comb-like Macromolecules on Surface and Their Application in Surface Hydrophobic Improvement | |||
JING Jing,ZHANG Yanwu | |||
Chemistry 25 March 2016 | |||
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Abstract:The self-assembling of single macromolecule is superior to that of multi macromolecules in enhancing functionalities due to stability of structure and insensitivity of assembling to concentration. Herein, multi-branched comb-like functional macromolecules are prepared through "grafting from" strategy via combination of ROMP and RAFT living polymerization in which back-bones are synthesized by living ROMP of norbornene derivative anchored with RAFT agent and branched chains are grafted by subsequent RAFT polymerization of hydrophilic 4-vinylpridine and hydrophobic tert-butyl acrylate. The molecular weights of these comb-like functional macromolecules are so great that they can self-assembly into arrays similar to the strcture of lotus leaf cuticle on solid surface in the form of single molecule. The comb-like macromolecules with hydrophilic poly(4-vinylpridine) branches are more effective to improve surface hydrophobicity because of the stronger interaction between substrate and poly(4-vinylpridine) branches. Self-assembling of single macromolecules on surface provides a potential feasible method to modify surface hydrophobic property. | |||
TO cite this article:JING Jing,ZHANG Yanwu. Self-Assembling of Single Comb-like Macromolecules on Surface and Their Application in Surface Hydrophobic Improvement[OL].[25 March 2016] http://en.paper.edu.cn/en_releasepaper/content/4682047 |
4. UV-curing bio-based resin from itaconic acid | |||
Zhou Zhaoxi,Cai Chenting,Liu Yongrui,Guo Jinshan | |||
Chemistry 24 March 2016 | |||
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Abstract:A biological based resin has been synthesized by the esterification reaction between itaconic acid (IA) and glycidyl methacrylate (GMA). IA-GMA resin was synthesized in a one-step reaction without emission, use of solvents or post-treatment. IA-GMA resin, with a certain viscosity at room temperature (15000mPa.s), is a mixture, and it was confirmed by FT-IR, 1H-NMR and ESI-ION TRAP MS. Both UV cured IA-GMA and thermo cured IA-GMA was confirmed by TGA and DMA, respectively. The properties of the UV cured co-IA-GMA, after being copolymerized with2, 2, 3, 4, 4, 4-Hexafluorobutyl acrylate (F-6), 1,1'-[(1-methyl-1,2-ethanediyl)bis[oxy (methyl-2,1-ethanediyl)]] ester (TPGDA) andTrimethylolpropanetrimethacrylate (TMPTA), was further studied. The results indicated that curing reactivity of IA-GMA resin is decided by steric effect and comonomers with different functionality lead to different mechanical property of IA-GMA copolymers. Thus, more renewable IA-GMA copolymer with satisfactory properties can be design and synthesised following this guidance. IA-GMA resin has great potential to be wildly used as UV curable resin instead of petroleum-based UV curing pre-polymer, such as epoxy acrylate. | |||
TO cite this article:Zhou Zhaoxi,Cai Chenting,Liu Yongrui, et al. UV-curing bio-based resin from itaconic acid[OL].[24 March 2016] http://en.paper.edu.cn/en_releasepaper/content/4681948 |
5. Unsaturated macrophotoinitiators with double bonds in side-chain: synthesis and photopolymerization behaviors | |||
Liu Yongrui,Ma Zhengfeng,Zhou Zhaoxi,Guo Jinshan | |||
Chemistry 07 March 2016 | |||
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Abstract:A series of unsaturated macrophotoinitiators (MPIs) with different contents of double bonds in side-chain were synthesized. Firstly, polymerizable photoinitiator monomer 2959-AA was synthesized through an esterification reaction between Irgacure 2959 (2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone) and acrylic acid (AA); Secondly, macrophotoinitiator P-1 was prepared via a copolymerization with acrylic monomers and 2959-AA; Finally, unsaturated macrophotoinitiators P-2, P-3, P-4 and P-5 were obtained by introducing double bonds into macrophotoinitiator P-1 with TMI (3-isopropenyl-2, 2-dimethyl-benyl-isocyanate). Base on the different proportion of TMI and macrophotoinitiator P-1, the series of products MPIs have different contents of double bonds. The photopolymerization behavior of 1, 6-hexanediol diacrylate (HDDA) was initiated using MPIs was studied with a photo-DSC test. The UV-cured films were studied by DMA. Results showed that all initiators had good performance in photopolymerization, and with the increase of the double bonds contents in MPIs, the glass transition temperature and storage modulus E'rubb of the films were increased. | |||
TO cite this article:Liu Yongrui,Ma Zhengfeng,Zhou Zhaoxi, et al. Unsaturated macrophotoinitiators with double bonds in side-chain: synthesis and photopolymerization behaviors[OL].[ 7 March 2016] http://en.paper.edu.cn/en_releasepaper/content/4680231 |
6. Thermoresponsive Dendronized Polypeptides Showing Switchable Recognition to Catechols | |||
YAN Jiatao,LIU Kun,LI Wen,SHI Huang,ZHANG Afang | |||
Chemistry 29 December 2015 | |||
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Abstract:A new class of thermoresponsive dendronized polypeptides was prepared through highly efficient oxime ligation between oxyamino-substituted polylysines and aldehyde-cored oligoethylene glycol (OEG) dendrons. Their secondary structures and thermoresponsive behavior were investigated. Due to the dendritic structures and stable oxime linkage, these OEG-based dendronized polypeptides exhibited fast and fully reversible phase transitions in neutrally aqueous solutions, and their phase transition temperatures can be controlled around physiological temperatures. The effect of OEG dendronization on secondary structures of polypeptides were examined to check their prominent dendritic shielding effect, steric hindrance, and thermally-driven phase transitions. To further extend the functions and potential applications of these stimuli-responsive dendronized polypeptides, phenylboronic acid moieties were introduced to achieve the corresponding dendronized copolymers, which were utilized to specifically recognize catechol-containing compounds such as alizarin red S or dopamine. These copolypeptides showed a significant enhancement to bind to catechols when comparing to monomeric phenylboronic acid. Furthermore, this enhanced binding can be switched surprisingly by thermally driven phase transitions or through addition of competitive catechols, which makes this class of dendronized polypeptides as unique scaffolds for selective and reversible recognition of catechols. | |||
TO cite this article:YAN Jiatao,LIU Kun,LI Wen, et al. Thermoresponsive Dendronized Polypeptides Showing Switchable Recognition to Catechols[OL].[29 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4674169 |
7. Synthesis of water-dispersible cylindrical polymer/TiO2 hybrid nanoparticles | |||
CHEN Shuai,WANG Fangyingkai,YUAN Kang,XIAO Jie,DU Jianzhong | |||
Chemistry 19 November 2015 | |||
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Abstract:The preparation of water-soluble cylindricalpolymer/TiO2 hybrid nanoparticles is an important technical challenge. In this paper we synthesized a functional triblock copolymer, poly(ethylene oxide)-block-poly[2-(dimethylamino)ethyl methacrylate]-block-polystyrene (PEO-b-PDMA-b-PS) by one-pot atom transfer radical polymerization (ATRP). The PEO-b-PDMA-b-PS triblock copolymer can self-assemble into functional polymeric cylinders in ethanol/THF mixture, with hydrophilic PEO block as the outer coronas, the functional PDMA block as the middle shell and the hydrophobic PS as the core. The cylinders have been further used for mediation of sol-gel reactions of tetrabutyl titanate (TBT) to prepare water-dispersible cylindrical polymer/TiO2 hybrid nanoparticles by the self-catalysis of PDMA shell. Our method provide a new insight for synthesizing water-dispersible polymer/TiO2 hybrid nanoparticles. | |||
TO cite this article:CHEN Shuai,WANG Fangyingkai,YUAN Kang, et al. Synthesis of water-dispersible cylindrical polymer/TiO2 hybrid nanoparticles[OL].[19 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4663809 |
8. Elastin-Based Comb-Like Polymers with Sharp Phase Transitions and Their Tunable Thermoresponsiveness via Dynamic Covalent Chemistry | |||
Bo Jie,Zhong Xing,Li Wen,Zhang Afang | |||
Chemistry 15 November 2015 | |||
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Abstract: Comb-like polymethacrylates carrying two branched elastin-like polypeptides (ELPs) composed of pentapeptide VPGVG (V = valine, P = proline and G = glycine) in each repeat unit were synthesized. The densely attached peptide chains affords these polymers sharp thermally-induced phase transition behavior within a narrow temperature range, and their phase transition temperatures can be varied with molecular weights, solution pH and salt concentrations. By virtue of these polymers containing amine-terminated ELP side chains, oligoethylene glycol (OEG)-based dendrons cored with aldehyde groups were attached to the polymers through Schiff-base reaction, forming a novel class of dynamic covalent thermoresponsive polymers. Interestingly, thermally-induced phase transitions of the dynamic covalent polymers could enhance the Schiff-base reaction, leading to LCST decrease of the polymers. Furthermore, storage conditions (below or above the freezing point) for the aqueous solutions of the dynamic covalent polymers surprisingly show influence on the OEG dendron coverages along the polymer side chains, which could easily tune the phase transition temperatures of the polymers between that dominated by ELPs and that dominated by OEG. | |||
TO cite this article:Bo Jie,Zhong Xing,Li Wen, et al. Elastin-Based Comb-Like Polymers with Sharp Phase Transitions and Their Tunable Thermoresponsiveness via Dynamic Covalent Chemistry[OL].[15 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4661401 |
9. Copolymer-Nanoparticles Mixture Confined in a Cylindrical Pore | |||
HAN Yu-Fang,PAN Jun-Xing,ZHANG Jin-Jun,WANG Bao-Feng,SUN Min-Na,GUO Yu-qi,WU Hai-shun | |||
Chemistry 14 April 2015 | |||
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Abstract:We have investigated the effect of nanoparticles(NPs) on diblock copolymer morphology under cylindrical confinement using Cell Dynamics Simulation. The nanoparticles are selective to the copolymer blocks, being repulsive to one block and attractive to the other. In comparison to the phase diagram in bulk of cylindrical confinement, more ordering structures are formed after adding nanoparticles. With the wetting strength and concentration of NPs increasing , the structures of block copolymers transform from disorder to order morphology. The effect of NPs wetting strength and concentration in different nanopore have been studied in detail. By developing a phase diagram to system morphology,we can meticulous know the phase morphology evolution. | |||
TO cite this article:HAN Yu-Fang,PAN Jun-Xing,ZHANG Jin-Jun, et al. Copolymer-Nanoparticles Mixture Confined in a Cylindrical Pore[OL].[14 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4638529 |
10. Cylindrically confined assembly of diblock copolymer under oscillatory shear flow | |||
GUO Yuqi,ZHANG Jinjun,WANG Baofeng,WU Haishun,SUN Minna,PAN Junxing | |||
Chemistry 20 March 2015 | |||
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Abstract:Manipulating the self-assembly nanostructures with combined different control measures is emerging as a promising route for numerous applications to generate templates and scaffolds for the nanostructured materials. Here, the two different control measures are the cylindrical confinement and oscillatory shear flow. We have studied the phase behavior of diblock copolymer confined in nanopore under oscillatory shear by considering the different $D/L_0$ and different shears via Cell Dynamics Simulation. Under different $D/L_0$ the system occurs different morphology evolution and phase transition with the change of amplitude and frequency. Also, it exists novel morphologies that we expect to obtain. For each $D/L_0$, we have constructed phase diagram of different forms with the change of amplitude and frequency and analyzed carefully the cause why the phase transition occurs. We have found that although the morphologies is different in different $D/L_0$, the cause of the phase transition is roughly the same. These results can guide experimentalist an easy method to create the ordered, defect-free nanostructured materials through the combined control measures of the cylindrical confinement and oscillatory shear flow. | |||
TO cite this article:GUO Yuqi,ZHANG Jinjun,WANG Baofeng, et al. Cylindrically confined assembly of diblock copolymer under oscillatory shear flow[OL].[20 March 2015] http://en.paper.edu.cn/en_releasepaper/content/4634399 |
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