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Cuong Manh Vu,Quang-Vu Bach 한국고분자학회 2020 Macromolecular Research Vol.28 No.9
In this work, the effects of 9,10-dihydro-9-oxa-10-phosphaphenanthrene- 10-oxide (DOPO) grafted epoxidized soybean oil (ESO-G-DOPO) on mechanical properties and flame retardant of rice husk silica filled epoxy based composite were investigated detail. The silica was extracted from rice husk before using as reinforcement for epoxy resin. While the epoxidized soybean oil (ESO) was synthesized from soybean oil via epoxidation processing prior to react with 9,10-dihydro-9-oxa- 10-phosphaphenanthrene-10-oxide (DOPO) to form ESO-G-DOPO. The Fourier transform infrared spectroscopy and nuclear magnetic resonance were used to confirm the chemical structure of silica, ESO and ESO-G-DOPO. The content of rice husk silica was also kept at constant of 20 wt.% while the content of ESO-G-DOPO was varying in range from 0 to 15 wt.% according to epoxy weight. The experimental results indicated that the presence of ESO-G-DOPO help to enhance the fracture energy, tensile strength, flexural strength up to 111.36, 67.26, and 87.79 %, respectively in comparison with virgin sample. Especially, the results of cone calorimeter testing, limiting oxygen index indicated that the flammability of epoxy resin was extremely reduced with presence of ESO-G-DOPO. A mechanism of flame retardant was also proposed to answer for the question how ESO-G-DOPO acted in a flame.
Cuong Manh Vu,Quang-Vu Bach,Huong Thi Vu,Dinh Duc Nguyen,Bui Xuan Kien,장순웅 한국고분자학회 2020 Macromolecular Research Vol.28 No.1
This paper presents an effective method for enhancing both the mode I (GIC) and mode II (GIIC) interlaminar fracture toughness of carbon fiber reinforced epoxy resin (CFRE). For precursor materials, silk fibroin nanofibers (nSF) and rice husk silica were prepared from sustainable resources. Nanocomposite samples were prepared using various loading ratios of the silica and nSF in epoxy resin (EP). Mechanical stirring and sonication techniques were used to prepare homogenous mixtures of silica and nSF in epoxy resin. Non-isothermal differential scanning calorimetry and the Kissinger equation were used to examine and calculate the cure kinetics and activation energy (Ea) of EP and the composite samples. The CFRE sample with hybrid fillers of nSF and silica at the ratio 0.2/20 (wt%/wt%) exhibited the highest GIC, and improved upon the mode-I and mode-II toughness of the pure-resin sample by 36.08% and 30.06%, respectively. Study of the fracture surfaces indicated that adding nSF and silica as fillers increases the energy required to fracture the CFRE.
Cuong Manh Vu,Dinh Duc Nguyen,Le Hoang Sinh,최형진,Tien Duc Pham 한국고분자학회 2018 Macromolecular Research Vol.26 No.1
The waste produced by bamboo stick production processing was collected from a Vietnamese craft village and used as a source of microfibril cellulose (MFC) for a filler of unsaturated polyester (UP) resin based composites in this study. A mixture of MFC in UP was obtained by directly introducing the bamboo pulp into UP resin followed by a grinding process using a ball-grinding machine. A master batch method was also adopted for composite preparation, in which a high-content solution of MFC in UP resin was first fabricated and then diluted to prepare another solution with the desired content. Morphology and mechanical characteristics of UP resin based composites were investigated. Effect of different methods of preparation, such as hand lay-up and vacuum bagging methods, on the mechanical properties of glass fiber reinforced UP resin composites was also examined, showing that the tensile strength of composite materials with 0.3 wt% MFC was increased by 10.24% (for the hand lay-up method) and 19.62% (for the vacuum bagging method) when compared with the pristine composite material. The flexural strength increased from 192.40 MPa to 208.63 MPa and the impact strength increased by 19.6% from 158.28 kJ/m2 to 186.84 kJ /m2 for the hand lay-up method.
To Dao Cuong,Hoang Thi Ngoc Anh,Tran Thu Huong,Pham Ngoc Khanh,Vu Thi Ha,Tran Manh Hung,김영호,Nguyen Manh Cuong 한국생약학회 2019 Natural Product Sciences Vol.25 No.4
Soluble epoxide hydrolases (sEH) are enzymes present in all living organisms, metabolize epoxy fatty acids to 1,2-diols. sEH in the metabolism of polyunsaturated fatty acids plays a key role in inflammation. In addition, the endogenous lipid mediators in cardiovascular disease are also broken down to diols by the action of sEH that enhanced cardiovascular protection. In this study, sEH inhibitory guided fractionation led to the isolation of five phenolic compounds trans-resveratrol (1), trans-piceatannol (2), sulfuretin (3), (+)-balanophonin (4), and cassigarol E (5) from the ethanol extract of the seeds of Passiflora edulis Sims cultivated in Vietnam. The chemical structures of isolated compounds were determined by the interpretation of NMR spectral data, mass spectra, and comparison with data from the literature. The soluble epoxide hydrolase (sEH) inhibitory activity of isolated compounds was evaluated. Among them, trans-piceatannol (2) showed the most potent inhibitory activity on sEH with an IC50 value of 3.4 mM. This study marks the first time that sulfuretin (3) was isolated from Passiflora edulis as well as (+)-balanophonin (4), and cassigarol E (5) were isolated from Passiflora genus.
Tobacco Control Policies in Vietnam: Review on MPOWER Implementation Progress and Challenges
Hoang, Van Minh,Tran, Thu Ngan,Vu, Quynh Mai,Nguyen, Thi Tuyet My,Le, Hong Chung,Vu, Duy Kien,Tran, Tuan Anh,Nguyen, Bao Ngoc,Vu, Van Giap,Nguyen, Manh Cuong,Pham, Duc Manh,Kim, Bao Giang Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
In Vietnam, the WHO Framework Convention on Tobacco Control (WHO FCTC) took effect in March 2005 while MPOWER has been implemented since 2008. This paper describes the progress and challenges of implementation of the MPOWER package in Vietnam. We can report that, in term of monitoring, Vietnam is very active in the Global Tobacco Surveillance System, completing two rounds of the Global Adult Tobacco Survey (GATS) and three rounds of the Global Youth Tobacco Survey (GYTS). To protect people from tobacco smoke, Vietnam has issued and enforced a law requiring comprehensive smoking bans at workplaces and public places since 2013. Tobacco advertising and promotion are also prohibited with the exception of points of sale displays of tobacco products. Violations come in the form of promotion girls, corporate social responsibility activities from tobacco manufacturers and packages displayed by retail vendors. Vietnam is one of the 77 countries that require pictorial health warnings to be printed on cigarette packages to warn about the danger of tobacco and the warnings have been implemented effectively. Cigarette tax is 70% of factory price which is equal to less than 45% of retail price and much lower than the recommendation of WHO. However, Vietnam is one of the very few countries that require manufacturers and importers to make "compulsory contributions" at 1-2% of the factory price of cigarettes sold in Vietnam for the establishment of a Tobacco Control Fund (TCF). The TCF is being operated well. In 2015, 67 units of 63 provinces/cities, 22 ministries and political-social organizations and 6 hospitals received funding from TCF to implement a wide range of tobacco control activities. Cessation services have been starting with a a toll-free quit-line but need to be further strengthened. In conclusion, Vietnam has constantly put efforts into the tobacco control field with high commitment from the government, scientists and activists. Though several remarkable achievements have been gained, many challenges remain. To overcome those challenges, implementation strategies that take into account the contextual factors and social determinants of tobacco use in Vietnam are needed.
유리섬유강화 에폭시 레진 복합체의 기계적, 유전체 특성에 미치는첨가제 함유 에폭시 영향
최형진(Hyoung Jim Choi),Cuong Manh Vu,Liem Thanh Nguyen,Thai Viet Ngryen 한국고분자학회 2014 폴리머 Vol.38 No.6
Three different types of additives, thiokol, epoxidized natural rubber (ENR) and epoxidized linseed oil (ELO),were dispersed in an epoxy matrix before being used in glass fiber (GF) composites, and their effects on the mechanicaland dielectric properties of epoxy resin and glass fiber reinforced epoxy composites (GF/EP) were examined. The additionof each of 7 phr ENR, 9 phr ELO and 5 phr thiokol into the epoxy resin increased the fracture toughness significantlyby 56.9, 43.1, and 80.0%, respectively, compared to the unmodified resin. The mode I interlaminar fracture toughnessof the GF/EP at propagation was also improved by 26.9, 18.3 and 32.7% when each of 7 phr ENR, 9 phr ELO, and 5 phrthiokol, respectively, was dispersed in the epoxy matrix. Scanning electron microscopy showed that the additives reducedcrack growth in the GF/EP, whereas their dielectric measurements showed that all these additives had no additional effecton the real permittivity and loss factor of the GF/EP.
Tai, Bui Huu,Huyen, Vu Thi,Huong, Tran Thu,Nhiem, Nguyen Xuan,Choi, Eun-Mi,Kim, Jeong Ah,Long, Pham Quoc,Cuong, Nguyen Manh,Kim, Young Ho The Pharmaceutical Society of Japan 2010 Chemical & pharmaceutical bulletin Vol.58 No.4
<P>The new pyrano-pyrone, (+)-8-epi-9-deoxygoniopypyrone (1) and (+)-9-deoxygoniopypyrone (2) were isolated from a chloroform extract of <I>Goniothalamus tamirensis</I> leaves. Their absolute stereostructures were discussed and confirmed by using infrared (IR), Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), one (1D) and two-dimensional (2D) nuclear magnetic resonance (NMR) spectra, Mosher's method, and comparison with the known compounds leiocapin A (3), deoxygoniopypyrone A (4), and (−)-8-epi-9-deoxygoniopypyrone (5). At concentrations of 2.67 μ<SMALL>M</SMALL>, compounds 1 and 2 significantly increased the growth of osteoblastic MC3T3-E1 cells and caused a significant elevation of collagen content, alkaline phosphatase activity, and nodule mineralization in the cells (<I>p</I><0.05). Our data suggest that the enhancement of osteoblast function by 1 and 2 may result in the prevention of osteoporosis.</P>