本文關(guān)鍵詞：多巴胺改性制備復(fù)合樹脂新型填料及其應(yīng)用研究　出處：《北京化工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 多巴胺 玻璃纖維 二氧化硅納米粒子 光固化樹脂 復(fù)合材料 界面粘結(jié)

【摘要】：生物粘附分子表面改性常常被引入到復(fù)合材料界面改性中。多巴胺是一種海洋粘附蛋白,富含兒茶酚基團(tuán),能粘附在性質(zhì)各異的基體表面,甚至包括聚四氟乙烯�；谶@種分子的表面改性技術(shù),能夠增強(qiáng)復(fù)合材料增強(qiáng)體和樹脂的界面強(qiáng)度,并且這種生物粘附劑在口腔濕潤環(huán)境下仍然具有良好的粘結(jié)作用。更重要的是,采用這種方法處理齒科修復(fù)材料,不會引起生物相容性方面的擔(dān)憂。因此,本論文采用多巴胺對玻璃纖維以及納米二氧化硅表面進(jìn)行處理,并與光固化樹脂復(fù)合,提高了有機(jī)-無機(jī)復(fù)合材料界面性能,獲得了高浸潤度纖維增強(qiáng)樹脂復(fù)合材料,可用于殘根殘冠的樁核治療修復(fù)。主要工作如下：(1)通過多巴胺氧化聚合改性和聚甲基丙烯酸甲酯(PMMA)吸附這兩種表面處理方法,制備了數(shù)種(多巴胺改性、PMMA包覆、多巴胺改性/PMMA包覆)玻璃纖維,通過XPS、Raman和SEM表征,證實(shí)了證明了目標(biāo)改性聚合物在玻璃纖維表面的包覆；以原始玻璃纖維為對照,制備了纖維增強(qiáng)光固化樹脂(Bis-GMA/TEGDMA)復(fù)合材料,通過“三點(diǎn)彎”測試、斷面形貌觀察、DMTA分析和拔出實(shí)驗(yàn),發(fā)現(xiàn)：改性纖維與樹脂基的界面粘結(jié)均優(yōu)于未處理的玻璃纖維,其中,經(jīng)多巴胺改性、然后又吸附PMMA的玻璃纖維增強(qiáng)光固化樹脂復(fù)合材料的界面性能最佳。解釋是,富含兒茶酚等官能團(tuán)的聚多巴胺與玻璃纖維以及PMMA層,通過螯合、氫鍵等作用粘附良好,而PMMA分子鏈與Bis-GMA/TEGDMA樹脂具有一定互溶性,樹脂經(jīng)光照固化后,可在界面處半互穿網(wǎng)絡(luò),形成良好的界面粘結(jié)。將兩種改性方法聯(lián)合應(yīng)用,可以獲得最大的界面粘結(jié)強(qiáng)度。(2)采用Stober法制備了二氧化硅納米粒子,并成功地用多巴胺氧化聚合進(jìn)行了包覆改性,基于多尺度多維度增強(qiáng)的思路,將多巴胺包覆的二氧化硅納米粒子預(yù)吸附到多巴胺改性玻璃纖維表面,然后一起作為光固化樹脂的增強(qiáng)體。發(fā)現(xiàn)：與單純多巴胺改性玻璃纖維增強(qiáng)復(fù)合材料比較,表面預(yù)吸附了二氧化硅納米粒子玻璃纖維增強(qiáng)的復(fù)合材料,經(jīng)DMTA測試Tg升高,證實(shí)其具有更好的界面粘結(jié)。原因是,在玻璃纖維表面的二氧化硅納米粒子,可能起到了“錨”的連接作用,更能限制分子鏈的運(yùn)動,提高界面粘結(jié)。本論文在樹脂基口腔修復(fù)復(fù)合材料研究中,引入多巴胺這種高效簡單的生物粘附分子表面處理方法,改善了增強(qiáng)體和樹脂之間的界面粘接力,提高了復(fù)合材料的力學(xué)性能。研究結(jié)果可為其他應(yīng)用的有機(jī)-無機(jī)復(fù)合材料界面改性提供參考。
[Abstract]:Surface modification of bioadhesive molecules is often introduced into the interfacial modification of composite materials. Dopamine is a kind of marine adhesion protein rich in catechol-group and can adhere to the matrix surface with different properties. Even PTFE. Surface modification techniques based on this molecule can enhance the interfacial strength of composite reinforcements and resins. And this kind of bioadhesive still has good adhesive effect in the moist environment of oral cavity. More importantly, using this method to deal with dental repair materials will not cause biocompatibility concern. In this paper, the surface of glass fiber and nano-silica was treated with dopamine, and the interface properties of organic-inorganic composites were improved. Fiber reinforced resin composites with high wettability were obtained. It can be used for the treatment of residual root and crown. The main work is as follows: 1) modified by dopamine oxidation polymerization and PMMA adsorption. Several kinds of glass fibers (dopamine modified PMMA and dopamine modified PMMA) were prepared and characterized by SEM and Raman spectra. It is proved that the coating of the target modified polymer on the glass fiber surface. The fiber reinforced light-cured resin Bis-GMA / TEGDMA composite was prepared by using the raw glass fiber as the control. The "three-point bending" test was carried out and the section morphology was observed. DMTA analysis and pull-out experiments showed that the interfacial bond between the modified fiber and the resin base was better than that of the untreated glass fiber, and the modified fiber was modified by dopamine. The interfacial properties of glass fiber reinforced light-cured resin composites adsorbed on PMMA are the best. The explanation is that polydopamine rich in catechol and other functional groups chelate with glass fiber and PMMA layer through chelation. Hydrogen bond adhesion is good, while PMMA molecular chain and Bis-GMA/TEGDMA resin have a certain mutual solubility, the resin can be cured by illumination, the semi-interpenetrating network at the interface can be obtained. When the two modification methods were combined, the maximum interfacial bond strength could be obtained. (2) silica nanoparticles were prepared by Stober method. The dopamine coated silica nanoparticles were preadsorbed on the surface of dopamine modified glass fiber based on the idea of multi-scale and multi-dimensional enhancement. It was found that compared with pure dopamine modified glass fiber reinforced composites, silica nanoparticles were preadsorbed on the surface of glass fiber reinforced composites. The increase of TG by DMTA test shows that it has better interfacial bond, because the silica nanoparticles on the surface of glass fiber may act as "anchor". In this paper, dopamine is introduced into the study of resin based dental repair composites, which is an efficient and simple biological adhesion molecular surface treatment method. The interfacial adhesion between reinforcements and resins was improved and the mechanical properties of composites were improved. The results can be used as reference for the interface modification of organic-inorganic composites.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332

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本文編號：1438159