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- 저자 : ThuHien Nguyen (검색결과 3 건)
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Chi Thi Pham,Binh Tan Nguyen,Minh Tuyet Nguyen,ThuHien Nguyen,Cuong Ngoc Hoang,Nguyen Ngan Nguyen,이평찬,김진환,DongQuy Hoang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-
The behavior of rPUf (polyurethane foam derived from bis(2-hydroxyethyl) terephthalate (BHET)recovered from post-consumer poly(ethylene terephthalate)-PET bottles) and cPUf (polyurethane foambased on a commercial polyol) were evaluated by comprehensive characterizations, and their thermalstabilities,flammabilities, and physical properties were compared. Without using aflame retardant, rPUfpassed the UL-94HB standard, whereas cPUf burned rapidly to the holding clamp. Various formulationsof rPUf and cPUf with established eco-friendlyfire retardants (FRs), including triphenyl phosphate,aluminum diethylphosphinate, and aluminum trihydroxide, exhibited notably higherfire resistance. Thedifferences between the experimental and calculated densities showed the effectiveness of the foamingprocess. A larger difference indicated that the FR improved the foaming process more. The BHET structurecontains an aromatic moiety that strongly enhanced the compressive strength and protected the rPUf/FRsfrom biodegradation, as evidenced by sorption isotherm experiments. For that reason, the rPUf/FRs couldbe used as building materials, especially under high humidity conditions. These are the advantages ofBHET over the commercial polyol for PUf preparation. Chemical recycle of post-consumer PET bottles toproduce high performance PUf could be applied on an industrial scale and then it creates the sustainablerecycling industry.
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ThuHien Nguyen,DongQuy Hoang,김진환 한국고분자학회 2018 Macromolecular Research Vol.26 No.1
The fire behavior and thermal stability of unsaturated polyester prepared from recycled poly(ethylene terephthalate) (RUP) in the present of two phosphorus- nitrogen flame retardants (FRs) including ammonium polyphosphate (APP) and melamine polyphosphate (MPP) have been investigated. The effectiveness of FRs on the fire proofing of material was test by UL-94 vertical classification and limiting oxygen index (LOI). The obtained data showed that the fire retardancy and thermal stability were remarkably enhanced with addition of FRs. The best grade of UL-94V standard, V-0 ranking was attained as loading of 25 wt% of APP or 30 wt% of MPP. LOI significantly were enhanced from 20 to 36%. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Scanning electron microscope (SEM) were applied to determine the structure and morphology of char layers of RUP and RUP/FR mixtures. Thermogravimetric analysis (TGA) method was applied to investigate thermal stability of neat RUP, FRs, and RUP/FR and to evaluate kinetic parameters of the decomposition of RUP/FR. The mechanism of action of FRs, schemes for the possible decomposition mechanism RUP and FRs, and the cooperation of matrix and additives were also discussed.
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DongQuy Hoang,ThuHien Nguyen,Haiyan An,김진환 한국고분자학회 2016 Macromolecular Research Vol.24 No.6
In an attempt to suppress the flammability of unsaturated polyesters (RUP) derived from recycled poly(ethylene terephthalate) (PET) and investigate the relationship between flame retardant (FR) chemical structures and their flame retardancy, RUP was incorporated with four organo-phosphorus FRs; triphenyl phosphate (TPP), aluminum hydrogen phosphonate (AHP), diammonium hydrogen phosphate (DAP), and aluminum diethyl phosphinate (OP). The effects of adding FR with regard to the thermal stability of RUP/FR mixtures were investigated via thermogravimetric analysis (TGA). The chemical structure of FR and its mixtures with RUP were determined via FTIR and X-ray photoelectron spectroscopy (XPS). The morphology of the residual char was investigated using a field emission scanning electron microscope (FE-SEM). Flame retardancies were evaluated by a UL-94 vertical test and limiting oxygen index (LOI) measurements. The results indicated that the presence of FR significantly improved the flame retardancy and thermal stability of RUP. LOI values increased from 20 to 28 and V-0 ratings were obtained with an 8 wt% FR loading for DAP and with a 10 wt% FR loading for OP. In contrast, no ratings were recorded for the mixture containing 30 wt% of TPP or AHP. These findings clearly indicate that the efficiency of a phosphorus-based FR depends on the quantity of phosphorus elements within the FR itself, although interactions of the FR with the target polymer should also be accounted for when determining its effectiveness as a FR.
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