本文選題：甲基乙烯基硅橡膠　切入點：真空紫外　出處：《華南理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本論文采用高能量的真空紫外燈輻照甲基乙烯基硅橡膠表面,在其表面產(chǎn)生反應(yīng)性位點,通過化學(xué)接枝或紫外光接枝反應(yīng)分別將殼聚糖或其衍生物、磺銨兩性離子以共價鍵形式接枝于硅橡膠表面,從而改善硅橡膠表面的親水性,并研究改性后的硅橡膠表面的抗細(xì)菌粘附性能。研究發(fā)現(xiàn):(1)采用172nm Xe2*真空紫外燈輻照硅橡膠200s后,水在硅橡膠表面的接觸角由102.5°變?yōu)楣柘鹉z表面完全浸潤,親水性得到很大改善,在自然環(huán)境中放置120h后硅橡膠表面的水接觸角變?yōu)?4.3°,親水性表面轉(zhuǎn)變?yōu)槭杷?(2)采用苯甲醛與殼聚糖反應(yīng)保護(hù)殼聚糖C2上的-NH2并脫去,使C6上的-OH發(fā)生親核取代反應(yīng)接枝季銨鹽側(cè)鏈,可以合成水溶性并保留C2上活潑基團(tuán)-NH2的季銨化殼聚糖;利用殼聚糖或其衍生物上的氨基與活化后的硅橡膠表面的硅醇反應(yīng),通過化學(xué)鍵成功地將殼聚糖或其衍生物接枝在硅橡膠表面,接枝后的硅橡膠表面與水的接觸角分別為67.2°和54.8°,在自然環(huán)境放置168h后接觸角仍只有81.8°和69.7°,具有較長久的親水性保持性;(3)通過1,3-丙磺酸內(nèi)酯(PS)與N-(3-二甲氨基丙基)甲基丙烯酰胺(DMAPMA)的親核取代反應(yīng)成功合成含有雙鍵的磺基甜菜堿型兩性離子;采用紫外光接枝反應(yīng)在硅橡膠表面成功接枝磺銨兩性離子,當(dāng)兩性離子單體濃度為8wt%、光引發(fā)劑濃度為4wt%及紫外光固化時間為20min時,硅橡膠表面接枝兩性離子效果最好,其表面接觸角為38.5°,親水性得到明顯改善,并且在自然環(huán)境中放置168h后只有66.9°,具有較好的親水性保持性;(4)將表面分別接枝殼聚糖衍生物、磺銨兩性離子的硅橡膠樣片分別與大腸桿菌和金黃色葡萄球菌接觸培養(yǎng)24h,改性后的硅橡膠樣片表面細(xì)菌粘附數(shù)量明顯減少,表現(xiàn)出良好的抗細(xì)菌粘附性能,并且改性后硅橡膠表面抗金黃色葡萄球菌的粘附性能要優(yōu)于大腸桿菌。
[Abstract]:In this paper, high energy vacuum ultraviolet lamp was used to irradiate the surface of methyl vinyl silicone rubber, and reactive sites were generated on the surface of methyl vinyl silicone rubber. Chitosan or its derivatives were chemically grafted or UV grafted, respectively. The amphoteric ion of ammonium sulfonate grafted on the surface of silicone rubber in the form of covalent bond, thus improving the hydrophilicity of the surface of silicone rubber. The bacteriological adhesion of modified silicone rubber surface was also studied. It was found that the contact angle of water on the surface of silicone rubber changed from 102.5 擄to complete infiltration of water on the surface of silicone rubber after irradiation with 172nm Xe2 * vacuum ultraviolet lamp for 200s. The hydrophilicity was greatly improved, the contact angle of water on the surface of silicone rubber was 94.3 擄after being placed in natural environment for 120 h, and the hydrophilic surface changed to hydrophobicity.) benzaldehyde reacted with chitosan to protect -NH _ 2 from removing -NH _ 2 on chitosan C2, and the hydrophilic contact angle became 94.3 擄, and the hydrophilic surface changed to hydrophobicity. The nucleophilic substitution reaction of -OH on C _ 6 was carried out to graft quaternary ammonium salt side chain, which could be used to synthesize water-soluble quaternary ammonium chitosan with active group -NH _ 2 on C _ 2. The amino groups on chitosan or its derivatives were used to react with silica alcohol on the surface of activated silicone rubber. The chitosan or its derivatives were successfully grafted onto the surface of silicone rubber by chemical bonds. The contact angles between the surface of grafted silicone rubber and water were 67.2 擄and 54.8 擄respectively. The contact angles were 81.8 擄and 69.7 擄after being placed in natural environment for 168 h. The nucleophilic substitution reaction of methacrylamide (DMAPMA) was used to synthesize the amphoteric ions containing double bonds of sulfobetaine. The amphoteric ion was successfully grafted on the surface of silicone rubber by UV grafting reaction. When the concentration of amphoteric monomer was 8 wt, the concentration of photoinitiator was 4wt% and the UV curing time was 20min, the effect of grafting amphoteric ion on the surface of silicone rubber was the best. The surface contact angle is 38.5 擄, the hydrophilicity is improved obviously, and only 66.9 擄after being placed in the natural environment for 168 h. The surface is grafted with chitosan derivatives respectively. The surface bacterial adhesion of the modified silicone rubber sample was significantly reduced and showed good anti-bacterial adhesion, when it was incubated with Escherichia coli and Staphylococcus aureus for 24 hours, respectively. The adhesion of modified silicone rubber to Staphylococcus aureus was superior to that of Escherichia coli.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB306

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