THE INVESTIGATION OF PLASMA TREATMENT AND GRAFT POLYMERIZATION OF THERMOSENSITIVE POLYMER HYDROGEL AND FUNCTION PROPERTIES

• Main Authors: Tsui-Shan Hung, 洪翠禪
• Other Authors: Ko-Shao Chen
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/48110455314467972551

博士 === 大同大學 === 材料工程學系(所) === 99 === The investigation divided into three sessions. At first thin film deposition and surface modification used plasma treatment. Hexamethyldisilazane (HMDSZ) and isopropanol (IPA) plasma deposited thin film on polystyrene (PS) and discussed the cell attachment. In addition surface modification polymeric used atmospheric pressure plasma to increase the hydrophilicity is also attempted. The second session polymerization reversible thermosensitive polymer used UV graft polymerization and application on energy-saving material, analyzed the light resistance. The last session preparation thermosensitive gold nano particles based surface modification theory combination of plasma surface activation, self-assembled monolayesrs (SAMs) and UV graft polymerization technology First of all, used cold plasma deposition poly lactic acid-like and organic silicon-like thin film on PS and analyzed the cell attachment. After IPA plasma treated the hydrophilicity increase on PS, cell culture of fibroblast, Caco2 and melanocyte, the cell attachment not inferior to commercial tissue culture polystyrene (TCPS). Additionally, surface modification is one of the functions of plasma treatment. The traditional plasma technology works under vacuum system, atmospheric pressure plasma without vacuum equipment, compared to traditional plasma have absolute advantage in the system at the cost of the equipment. As thermoplastic urethane (TPU), PS and polyester fabric with stability, but its surface is hydrophobic and low surface energy, difficult to do coating and limiting its application. So take use of helium gas with low breakdown voltage and work with oxygen atmospheric pressure plasma surface modification change the treatment time, gas ratio and power for different plasma, observed the hydrophilic change of TPU and polyester fabric and to explore the best parameters. After atmospheric pressure plasma treatment, the water contact angle of TPU changes from 94° to 50° and PE fabric changes from 128° to 64°. The ESCA results demonstrated oxygen percentage of TPU raised from 13.66％ to 31.54% and scanning electron microscopy (SEM) were used for characterize the surface morphology. The second session of the study, the electricity consumption is too much in air conditioner so that the power source is wasted in livelihood (such as building and transportation). For the purpose to save energy and to reduce the electricity consumption in air conditioner, must began to reduce the heat energy from outside in to increase the efficiency of air conditioner. Therefore, if a thermochromism material to cut off a large of heat when the sunshine, should fit the aim in comfortable and save energy. the investigate of thermochromism reversible smart polymer poly N-isopropylacrylamide (PNIPAAm), to develop the smart sandwich like plywood could be heat reflection and get in the light. To resist the superheat rays from outside in when the high temperature, enable the bright from outdoor to enter in low temperature. The result showed the thickness of thermochromism for 2mm the energy saving ratio is 0.55. Gold nano particles are widely used in surface plasmon (SPR) resonance studies. SPR technology has become a leading technology in the field of real-time observation of biomolecular interactions. But there are expensive and easily to aggregate when keep for long time of gold nano particles. So the technology of prepare thermosensitive gold nano particles by plasma modification and UV graft polymerization has been developed in this study. The thermosensitive gold nano particle could settle to the bottom in the liquid when raise the temperature and the thermosensitive gold nano particle could be recycle. Gold nano particles (Nano-Au) were reduced by trisodium citrate combined with hydrogen tetrachloroaurate (Ⅲ) tetrahydrate (chloroauric acid) and modified with 11-mercaptoundecanoic acid (MUA) by the self-assembled monolayesrs (SAMs). The surface graft polymerization of N-isopropylacrylamide (NIPAAm) was carried out by two steps, using O2 plasma pretreatment of the surface on MUA SAM modified Nano-Au to form the peroxide groups on Nano-Au (MUA), and then subsequently using UV light to induce grafting thermosensitive polymer. The thermosensitive gold nano particles were wine-red and could settle to the bottom in the liquid which heating to 40℃ and maintain 15 min. The thermosensitive gold nano particles were characterized with UV-vis. The surface plasmon resonance is clearly visible as a peak in the in 520 nm of thermosensitive gold nano particles settle to the bottom in the liquid and the upper solution not showed any peak. The investigated the frequency shift of the gold film electrode of a quartz crystal microbalances (QCM) made by steps of applying self-assembling monolayer (SAM), plasma treatment and UV-induced graft polymerization on the surface. The frequency decrease 13687±81 Hz.