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- 저자 : Ruiwei Guo (검색결과 4 건)
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Ruiwei Guo,Yifan Liu,Yao Zhang,Anjie Dong,Jianhua Zhang 한국고분자학회 2013 Macromolecular Research Vol.21 No.10
Surface coating with amphiphilic block copolymers containing a long hydrophobic anchor block in polar solvent often suffered from the damaging impact of micelles, often leading to a significant decrease in adsorption amount and packing density. In this study, a series of amphiphilic comb-shape block copolymers, poly[poly(ethylene glycol) methyl ether acrylate]-b-poly(styrene-co-N,N-dimethylacrylamide) (P(PEGMEA)-b-P(St-DMA)) were synthesized successfully by reversible addition-fragmentation chain transfer (RAFT) polymerization with fluorescencelabelled RAFT agent. The chain structure and chemical composition of copolymers were characterized by 1H NMR,FTIR and GPC. The surface self-assembled coating through physical adsorption of P(PEGMEA)-b-P(St-DMA) in ethanol on the surface of polyacrylonitrile (PAN) membrane was investigated by XPS, ATR-FTIR, SEM and water contact angle measurements. The antifouling properties of the modified membranes were evaluated using BSA as a model protein. It was found that the introduction of appropriate DMA (DMA/St in the range of about 0.1 to 0.2) into the hydrophobic segment can significantly increase the solubility of copolymers and alter their aggregation behaviors,alleviate the impact of micelles, increase adsorbed amount of copolymers, and thus can enhance the hydrophilicity and anti-fouling properties of membranes. Moreover, the stability analysis indicated that P(PEGMEA)-b-P(St-DMA) with appropriate DMA in the hydrophobic anchor block can form a relatively stable coating on the surface of PAN membrane. Consequently, the adjustment of the structure and composition of anchor segment may be a potential solution to the trade-off among solubility, adsorption amount and coating stability when amphiphilic block copolymers were used to surface modification by self-assembled coatings.
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Initiation Mechanisms of Styrene with Methyl Ethyl Ketone Peroxide- Cobalt System
Ruiwei Guo,Yaqi Wang,Yongtao Qi,Auke G Talma,Jianhua Zhang 한국고분자학회 2018 Macromolecular Research Vol.26 No.8
Unsaturated polyester resins (UPR) cured with styrene has been widely used in the various industrial fields. Methyl ethyl ketone peroxides (MEKP)-cobalt(II) system is the most common initiator for the curing of UPR. However, its initiation mechanisms currently remain elusive. In this study, the monomeric MEKP (MEKP-1) was firstly separated out from the commercial MEKP products, and then the radical initiation mechanisms of MEKP-1 catalyzed by cobalt isooctoate in the presence and absence of styrene were comparatively investigated by a combination of nitroxide radical trapping technique and HPLC-ESI/MS (high performance liquid chromatography- electrospray ionization/mass spectrometry). The amount of trapped products originated from methyl radical, ethyl radical and hydroxyl radical was significantly larger than that of trapped products from other radicals. These results indicated that methyl, ethyl and hydroxyl radicals were the dominant intermediate radicals formed in the initiation process of MEKP-cobalt(II) system, which would serve as the primary source to initiate styrene polymerization.
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Multi-Dimensional Selection Method of Port Logistics Location Based on Entropy Weight Method
Ruiwei Guo 한국정보처리학회 2023 Journal of information processing systems Vol.19 No.4
In order to effectively relieve the traffic pressure of the city, ensure the smooth flow of freight and promote thedevelopment of the logistics industry, the selection of appropriate port logistics location is the basis of givingfull play to the port logistics function. In order to better realize the selection of port logistics, this paper adoptsthe entropy weight method to set up a multi-dimensional evaluation index, and constructs the evaluation modelof port logistics location. Then through the actual case, from the environmental dimension and economiccompetition dimension to make choices and analysis. The results show that port d has the largest logisticscompetitiveness and the highest relative proximity among the three indicators of hinterland city economicactivity, hinterland economic structure, and port operation capacity of different port logistics locations, whichhas absolute advantages. It is hoped that the research results can provide a reference for the multi-dimensionalselection of port logistics site selections.
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Yang Xue,Xiaohua Li,Shixian Zhang,Ruiwei Guo 한국고분자학회 2021 Macromolecular Research Vol.29 No.7
Chain transfer reactions are important side reactions in the radical polymerization of acrylates. Discrimination between interchain and intrachain transfer is still a challenge for the study of interchain transfer. A prepolymer, poly(benzyl acrylate) with hydroxy terminals (HO-PBzA), was designed and used in the reversible addition-fragmentation chain transfer (RAFT) polymerization of BzA to measure the interchain transfer degree, with benzyl N-carbazole dithiocarbamate (BCBD) as the RAFT agent. Liquid chromatography at critical conditions was used to separate and measure interchain transfer products and then BzA interchain transfer constants (Ctr) at different temperatures determined without other kinetic parameters. Experimental results showed that experimental parameters in RAFT polymerization, except the high dosage of BCBD, had no significant effects on the measured Ctr, which showed good repeatability. The Ctr of benzyl acrylate at 100-120 °C was in the order of 1-2×10-4 and the activation energy of Ctr was at 31.1 kJ∙mol-1.
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