UV-curable hyperbranched polyurethane (UV-HBPU) containing carboxyl groups was synthesized from isophorone diisocyanate (IPDI), diethanolamine (DEOA), polyethylene glycol (PEG-400), hydroxyethyl acrylate (HEA...UV-curable hyperbranched polyurethane (UV-HBPU) containing carboxyl groups was synthesized from isophorone diisocyanate (IPDI), diethanolamine (DEOA), polyethylene glycol (PEG-400), hydroxyethyl acrylate (HEA), and 2,2-his (hydroxymethyl) propionic acid (DMPA). The UV-HBPU was used as a negative-type photoresist for a printed circuit board (PCB). Fourier-transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1HNMR) spectroscopy of UV-HBPUs indicated that the synthesis was successful. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) showed that the thermal stability of the UV-HBPUs decreased as the HEA content increased. The polymer exhibited excellent photoresist properties, and the resolution of circuits based on this negative-type photoresist reached 10 μm.展开更多
Skin aging is a process most often attributed to UV<span><span><span style="font-family:" minion="" pro="" capt","serif";"=""><span styl...Skin aging is a process most often attributed to UV<span><span><span style="font-family:" minion="" pro="" capt","serif";"=""><span style="font-family:Verdana;"> </span></span></span></span><span><span><span style="font-family:" minion="" pro="" capt","serif";"=""><span></span></span></span></span><span><span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">[1]</span></span></span><span><span><span style="font-family:" color:#943634;"=""></span></span></span><span><span></span></span><span></span><span><span><span></span></span></span><span><span></span></span><span></span><span><span></span></span><span><span><span style="font-family:" color:red;"=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">and</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> also to the use of creams and other cosmetic products low in antioxidant compounds </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">[2]</span></span></span><span><span><span style="font-family:;" "=""></span></span></span><span><span></span></span><span></span><span><span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">. Photochemically stable pepo Cucurbita oil can be used as an exogenous cosmetic supplement due to its high antioxidant content. Incorporated in an agar, media containing a synthetic melanin solution with added pumpkin oil are subjected to UV light, the aging thus modeled is followed by the measurement of photoresistance values correlated with chemical and spectrophotometric analyses. This study confirms that pumpkin oil is highly effective in protecting the skin, especially the most sensitive skins such as babies’ skin </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">[3]</span></span></span><span><span><span style="font-family:;" "=""></span></span></span><span><span></span></span><span></span><span><span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> by reinforcing the action of melanin </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">and</span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;"> also that of albinos without melanin. Indeed its SPF (<b>Significant Sun Protection Factor</b>) index estimated during this work is very consistent,</span><i><span style="font-family:Verdana;"> i.e.</span></i><span style="font-family:Verdana;"> more than 22% of UVB (<b>280</span></span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:Verdana;">315 nm</b>) radiations are suppressed.展开更多
In this paper,we report the study of the process of fabricating a multi-layermetal micro-structure using UV-LIGA overlay technology,includingmask fabrication,substrate treatment,and UV-LIGA overlay processes.To solve ...In this paper,we report the study of the process of fabricating a multi-layermetal micro-structure using UV-LIGA overlay technology,includingmask fabrication,substrate treatment,and UV-LIGA overlay processes.To solve the process problems in the masking procedure,the swelling problemof the first layer of SU-8 thick photoresist was studied experimentally.The 5μmline-width compensation and closed 20μmand 30μmisolation strips were designed and fabricated around the micro-structure pattern.The pore problemin the Ni micro-electroforming layer was analyzed and the electroforming parameters were improved.The pH value of the electroforming solution should be controlled between 3.8 and 4.4 and the current density should be below 3 A/dm^2.To solve the problems of high inner stress and incomplete development of the micro-cylinder hole array with a diameter of 30μm,the lithography process was optimized.The pre-baking temperature was increased via gradient heating and rose every 5℃ from 65℃ to 85℃ and then remained at 85℃ for 50 min–1 h.In addition,the full contact exposure was used.Finally,a multi-layer metal micro-structure with high precision and good quality of microelectroforming layer was fabricated using UV-LIGA overlay technology.展开更多
利用合成的碱溶性光敏树脂配制成光致抗蚀剂,对固化速率、碱溶性、涂膜表面干燥性、显影和脱膜等进行了研究。结果表明:树脂含量大于70%时,涂膜具有较好的表面干燥性、显影性和脱膜性能;光引发剂含量为5%左右,固化速率较高;50℃超声波下...利用合成的碱溶性光敏树脂配制成光致抗蚀剂,对固化速率、碱溶性、涂膜表面干燥性、显影和脱膜等进行了研究。结果表明:树脂含量大于70%时,涂膜具有较好的表面干燥性、显影性和脱膜性能;光引发剂含量为5%左右,固化速率较高;50℃超声波下用3%Na2CO3显影2 m in,图象清晰度较高。展开更多
基金Funded by the National Natural Science Foundation of China(Nos.51203063,51103064)
文摘UV-curable hyperbranched polyurethane (UV-HBPU) containing carboxyl groups was synthesized from isophorone diisocyanate (IPDI), diethanolamine (DEOA), polyethylene glycol (PEG-400), hydroxyethyl acrylate (HEA), and 2,2-his (hydroxymethyl) propionic acid (DMPA). The UV-HBPU was used as a negative-type photoresist for a printed circuit board (PCB). Fourier-transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1HNMR) spectroscopy of UV-HBPUs indicated that the synthesis was successful. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) showed that the thermal stability of the UV-HBPUs decreased as the HEA content increased. The polymer exhibited excellent photoresist properties, and the resolution of circuits based on this negative-type photoresist reached 10 μm.
文摘Skin aging is a process most often attributed to UV<span><span><span style="font-family:" minion="" pro="" capt","serif";"=""><span style="font-family:Verdana;"> </span></span></span></span><span><span><span style="font-family:" minion="" pro="" capt","serif";"=""><span></span></span></span></span><span><span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">[1]</span></span></span><span><span><span style="font-family:" color:#943634;"=""></span></span></span><span><span></span></span><span></span><span><span><span></span></span></span><span><span></span></span><span></span><span><span></span></span><span><span><span style="font-family:" color:red;"=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">and</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> also to the use of creams and other cosmetic products low in antioxidant compounds </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">[2]</span></span></span><span><span><span style="font-family:;" "=""></span></span></span><span><span></span></span><span></span><span><span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">. Photochemically stable pepo Cucurbita oil can be used as an exogenous cosmetic supplement due to its high antioxidant content. Incorporated in an agar, media containing a synthetic melanin solution with added pumpkin oil are subjected to UV light, the aging thus modeled is followed by the measurement of photoresistance values correlated with chemical and spectrophotometric analyses. This study confirms that pumpkin oil is highly effective in protecting the skin, especially the most sensitive skins such as babies’ skin </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">[3]</span></span></span><span><span><span style="font-family:;" "=""></span></span></span><span><span></span></span><span></span><span><span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> by reinforcing the action of melanin </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">and</span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;"> also that of albinos without melanin. Indeed its SPF (<b>Significant Sun Protection Factor</b>) index estimated during this work is very consistent,</span><i><span style="font-family:Verdana;"> i.e.</span></i><span style="font-family:Verdana;"> more than 22% of UVB (<b>280</span></span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:Verdana;">315 nm</b>) radiations are suppressed.
文摘In this paper,we report the study of the process of fabricating a multi-layermetal micro-structure using UV-LIGA overlay technology,includingmask fabrication,substrate treatment,and UV-LIGA overlay processes.To solve the process problems in the masking procedure,the swelling problemof the first layer of SU-8 thick photoresist was studied experimentally.The 5μmline-width compensation and closed 20μmand 30μmisolation strips were designed and fabricated around the micro-structure pattern.The pore problemin the Ni micro-electroforming layer was analyzed and the electroforming parameters were improved.The pH value of the electroforming solution should be controlled between 3.8 and 4.4 and the current density should be below 3 A/dm^2.To solve the problems of high inner stress and incomplete development of the micro-cylinder hole array with a diameter of 30μm,the lithography process was optimized.The pre-baking temperature was increased via gradient heating and rose every 5℃ from 65℃ to 85℃ and then remained at 85℃ for 50 min–1 h.In addition,the full contact exposure was used.Finally,a multi-layer metal micro-structure with high precision and good quality of microelectroforming layer was fabricated using UV-LIGA overlay technology.
基金Supported by NSF of China (No 60473133No 10575097)+1 种基金the ' Hundred Talented' Projects from ACS,the 973 Project (No 2006CB303102)the SRFDP (No 20060358050),and the 111 Projects