本文選題：同軸靜電紡絲技術(shù) + 核-殼納米纖維��； 參考：《東華大學(xué)》2017年碩士論文

【摘要】：氫鍵是一種比離子鍵、配位鍵等化學(xué)鍵弱的多的相互作用,但卻在改善聚合物相容性、提高復(fù)合物的穩(wěn)定性、顯著改善化合物的物理特性和結(jié)晶結(jié)構(gòu)等方面起著非常重要的作用。而氫鍵既可以在本體中形成,也可以在各種界面上形成。目前,氫鍵在界面上形成的主要研究是利用氫鍵做為層層自組裝技術(shù)的驅(qū)動(dòng)力制備界面氫鍵復(fù)合膜,但是關(guān)于在界面上形成氫鍵的復(fù)合纖維的文章卻鮮有報(bào)道。這主要是因?yàn)橹苽浣缑鏆滏I復(fù)合纖維操作困難,而且纖維尺寸不可控。同軸靜電紡絲為制備在界面上形成氫鍵的核-殼復(fù)合纖維提供了一個(gè)簡(jiǎn)單有效的方法。本文以聚環(huán)氧乙烷(PEO)作為氫鍵受體,聚丙烯酸(PAA)作為氫鍵供體,因?yàn)镻EO可與PAA可形成構(gòu)象較為伸展、流體力學(xué)體積較大PEO/PAA氫鍵復(fù)合物。首先,我們分別紡制了不同濃度,不同電壓下的PEO和PAA納米纖維膜,探究了聚合物溶液性質(zhì),紡絲工藝和環(huán)境對(duì)纖維形貌的影響,為制備核-殼納米纖維奠定一定的實(shí)驗(yàn)基礎(chǔ)。并通過(guò)SEM對(duì)纖維形貌進(jìn)行表征,DSC和纖維強(qiáng)力測(cè)試儀對(duì)纖維膜的熱力學(xué)性能和機(jī)械性能進(jìn)行表征。而FI-IR光譜則是為了測(cè)試?yán)w維膜中氫鍵的形成和強(qiáng)弱。PAA是一種具有良好機(jī)械性能,熱力學(xué)穩(wěn)定性能的聚電解質(zhì),其親水官能團(tuán)-COOH良好的化學(xué)活性,使PAA被廣泛用于高吸水性樹(shù)脂,污水中染料和金屬離子的吸附等方面。但PAA本身易溶于水,所以需要對(duì)PAA進(jìn)行交聯(lián),提高其在水中的穩(wěn)定性,本實(shí)驗(yàn)以EG作為交聯(lián)劑,H2SO4作為引發(fā)劑,并將紡制好的PAA納米纖維膜放在不同交聯(lián)溫度下進(jìn)行熱處理。探究了交聯(lián)劑的濃度,PAA紡絲液濃度和電壓對(duì)PAA納米纖維膜形態(tài)的影響及交聯(lián)溫度,交聯(lián)時(shí)間對(duì)PAA納米纖維交聯(lián)程度的影響。通過(guò)同軸靜電紡絲法分別制備了PEO-PAA和PEO-PAA/EG核-殼納米纖維。通過(guò)利用SEM對(duì)核-殼纖維的表面進(jìn)行表征,利用TEM對(duì)纖維的核-殼結(jié)構(gòu)進(jìn)行表征,制備出直徑均勻,核-殼結(jié)構(gòu)完善的同軸納米纖維。在實(shí)驗(yàn)過(guò)程中,不斷改變核給液速度,制備出不同界面面積的核-殼納米纖維,并通過(guò)FT-IR光譜對(duì)其進(jìn)行表征,驗(yàn)證了在核組分PEO和殼組分PAA界面上形成了氫鍵。此外,還對(duì)兩種核-殼納米纖維進(jìn)行熱交聯(lián),通過(guò)纖維強(qiáng)力測(cè)試儀對(duì)熱交聯(lián)前后的核-殼納米纖維膜的力學(xué)性能進(jìn)行表征。
[Abstract]:Hydrogen bond is a much weaker interaction than ionic bond, coordination bond and other chemical bond, but it improves the compatibility of polymer and the stability of complex.It plays an important role in improving the physical properties and crystal structure of the compounds.Hydrogen bonds can be formed both in the body and at various interfaces.At present, the main research on the formation of hydrogen bond on the interface is to use hydrogen bond as the driving force of the self-assembly technology to prepare the interface hydrogen bond composite film, but there are few reports on the formation of hydrogen bond composite fiber on the interface.This is mainly due to the preparation of interfacial hydrogen bond composite fiber difficult to operate, and the size of the fiber is not controllable.Coaxial electrostatic spinning provides a simple and effective method for the preparation of core-shell composite fibers with hydrogen bonding at the interface.In this paper, poly (ethylene oxide) (PEO) was used as hydrogen bond receptor and polyacrylic acid (PAA) as hydrogen bond donor, because PEO and PAA can form conformational extension and hydrodynamic bulk PEO/PAA hydrogen bond complex.Firstly, PEO and PAA nanofibers with different concentrations and different voltages were prepared, and the effects of polymer solution properties, spinning process and environment on the morphology of the fibers were investigated, which laid a certain experimental foundation for the preparation of core-shell nanofibers.The morphology of the fiber was characterized by SEM and the thermodynamic and mechanical properties of the film were characterized by fiber strength tester.The FI-IR spectrum is designed to test the formation of hydrogen bonds in fiber membrane and its strength. PAA is a kind of polyelectrolyte with good mechanical and thermodynamic stability. Its hydrophilic functional group -COOH has good chemical activity, which makes PAA widely used in superabsorbent resin.Adsorption of dyes and metal ions in sewage.However, PAA is easily soluble in water, so it is necessary to cross-link PAA to improve its stability in water. In this experiment, EG was used as crosslinking agent and H _ 2SO _ 4 as initiator, and the spun PAA nanofiber films were treated at different crosslinking temperatures.The effects of crosslinking agent concentration and voltage on the morphology of PAA nanofibers and the effects of crosslinking temperature and crosslinking time on the crosslinking degree of PAA nanofibers were investigated.PEO-PAA and PEO-PAA/EG core-shell nanofibers were prepared by coaxial electrostatic spinning.The core-shell nanofibers with uniform diameter and perfect core-shell structure were prepared by using SEM to characterize the core-shell fiber surface and TEM to characterize the core-shell structure.In the process of experiment, core-shell nanofibers with different interface areas were prepared by changing the rate of nucleation feeding, and characterized by FT-IR spectra. It was verified that hydrogen bonds were formed at the interface of nuclear component PEO and shell component PAA.In addition, two kinds of core-shell nanofibers were thermally crosslinked. The mechanical properties of core-shell nanofibers before and after thermal crosslinking were characterized by fiber strength tester.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TQ340.64;TB383.1

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