Preparation and permeation characteristics of PVA/PEG/TEOS hybrid membranes

以聚乙烯醇(PVA)与聚乙二醇(PEG)共混,并与正硅酸乙酯(TEOS)进行交联反应制备杂化膜。FTIR证实杂化溶胶液发生交联反应形成共价键Si—O—C,WXRD观察表明加入TEOS改变了膜结晶度,加入PEG提高了PVA膜对乙醇/水溶液的渗透通量,但分离因子下降,随着TEOS的加入,膜的分离因子提高。在TEOS质量分数为10%时,杂化膜的分离因子达到最大。提高退火温度可以提高膜的分离因子,但通量下降。在100℃下退火12 h的杂化膜对乙醇质量分数为85%的乙醇/水溶液的分离性能最佳。Poly(vinyl alcohol)(PVA) was mixed with poly(ethylene glycol)(PEG) and then cross-linked by tetraethoxysilane (TEOS) to prepare organic-inorganic hybrid membranes.Fourier transform infrared spectroscopy(FTIR) proved that covalent bond Si—O—C was formed in the hybrid membranes.Wide-angle X-ray diffraction(WAXD) was used to observe the effect of TEOS and annealing on crystallinity.The hybrid membranes were tested in separation ethanol/water mixture by pervaporation.The effect of PEG,TEOS content and annealing temperature on the PVA hybrid membrane performance was discussed.The addition of PEG increased the PVA membrane flux,but its selectivity decreased.Water permselectivity increased with the addition of TEOS into the PVA/PEG membrane.The hybrid membrane exhibited the highest water permselectivity when TEOS mass fraction was 10%.Water permselectivity increased by increasing the annealing temperature,but permeation flux decreased at the same time.The hybrid membrane separation performance was best for pervaporation of water/ethanol(85%mass fraction of ethanol) mixture when annealing at 100 ℃ for 12 h.国家自然科学基金资助项目(50573063);; 高等学校博士点专项基金资助项目(20050384013

山路指示裝置

M527456TWN2E01F-009/608(2016.01);E01F-009/50(2016.01); E01F-009/608(2016.01)104219090[[abstract]]本創作係提供一種山路指示裝置。用於安置在視野被阻隔的大角度拐彎處，包括測距儀及指示器，所述測距儀包括第一測距儀和第二測距儀，所述指示器包括第一指示器和第二指示器，所述第一測距儀與第一指示器連接，第二測距儀與第二指示器連接；所述第一、第二測距儀分別位於左側與右側，所述第一指示器與第二測距儀同側、第二指示器與第一測距儀同側；所述指示器包括多個光源，當測距儀檢測到有車接近時所述光源開始發光，發光的光源的數目與檢測到的車距負相關。本創作能夠避免交通事故的發生，保障了駕駛員的生命財產安全。[[notice]]補正完