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首页> 外文学位 >Polymers for Novel Applications: I. Hydrogel Implants for Post-Lumpectomy Patients and II. Cellulose Nanofibrous Composite Membrane for Heavy Metal Adsorption.
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Polymers for Novel Applications: I. Hydrogel Implants for Post-Lumpectomy Patients and II. Cellulose Nanofibrous Composite Membrane for Heavy Metal Adsorption.

机译：用于新型应用的聚合物：I.乳房切除术后患者的水凝胶植入物和II。用于重金属吸附的纤维素纳米纤维复合膜。

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摘要

I. Breast cancer patients who have followed the lumpectomy procedure to take out the infected tissue will leave an empty space in their breasts. The aim of this study is to design and synthesize a novel Pluronics-based hydrogel that is radiation resistant, osmotic pressure balanced, radiological imaging friendly, while temporarily replicating the physical and mechanical properties of the native breast tissue. In order to produce a photo-cross-linkable hydrogel, Pluronics F127 was chemically modified from copolymer Poloxamer 407, by using diacrylates. The modified hydrogel, to our knowledge, is non-toxic and biocompatible to the human body. Furthermore, it can act as a scaffold to regenerate natural tissue in the presence of growth factors. In the process, the hydrogel will be designed to degrade slowly in order to accommodate the regenerated tissue as well as to maintain the shape of the breast. Therefore, this new hydrogel will be an innovative approach for breast reconstruction applications.;II. The heavy metal pollution problem is an environmental concern in developing and developed countries. The current study is designed for a novel microfiltration membrane consisting of cellulose nanofibers (CNF) and amino-modified cellulose nanofibers (mCNF), infused in an electrospun polyacrylonitrile (PAN) scaffold on a non-woven polyethylene terephthalate (PET) support, which can effectively remove a range of heavy metals from water. The high porosity, large surface area per unit volume and dense charges of the nanoscale-web structure can provide the resultant micro-filtration membrane with an ability to remove 159mg Pb (II) per gram CNF (0.766 mmol/g) and 71mg Cr (VI) per gram mCNF(1.36 mmol/g) by static adsorption. For dynamic adsorption, the CNF composite membrane is able to remove 259 mg/g (1.25 mmol/g) Pb (II), while the mCNF composite membrane is able to remove 100 mg/g (1.92 mmol/g) Cr (VI). Furthermore, the composite membrane can be recycled by utilizing a desorption cycle, which can remove 100 % of the adsorbed metal ions from the membrane. Therefore, a low cost, safe and effective pathway for heavy metal ion removal has been developed.
机译：I.进行了肿块切除术以切除受感染组织的乳腺癌患者将在乳房中留下一个空白处。这项研究的目的是设计和合成一种新型的基于Pluronics的水凝胶，该水凝胶具有抗辐射，渗透压平衡，放射成像友好的特点，同时可以临时复制天然乳腺组织的物理和机械特性。为了生产可光交联的水凝胶，通过使用二丙烯酸酯从共聚物泊洛沙姆407对Pluronics F127进行了化学改性。据我们所知，改性水凝胶对人体无毒且生物相容。此外，它可以作为支架在生长因子存在下再生天然组织。在此过程中，水凝胶将被设计为缓慢降解，以适应再生的组织并保持乳房的形状。因此，这种新的水凝胶将是用于乳房再造应用的创新方法。重金属污染问题是发展中国家和发达国家关注的环境问题。当前的研究是针对由纤维素纳米纤维（CNF）和氨基改性纤维素纳米纤维（mCNF）组成的新型微滤膜而设计的，该膜被注入到静电纺聚丙烯腈（PAN）支架中，该支架在无纺聚对苯二甲酸乙二醇酯（PET）支撑物上可以有效地从水中去除多种重金属。纳米级网状结构的高孔隙率，大单位面积表面积和密集电荷可为所得的微滤膜提供每克CNF（0.766 mmol / g）和71mg Cr（ VI）/每克mCNF（1.36 mmol / g）的静态吸附。对于动态吸附，CNF复合膜能够去除259 mg / g（1.25 mmol / g）的Pb（II），而mCNF复合膜能够去除100 mg / g（1.92 mmol / g）的Cr（VI） 。此外，可以通过利用解吸循环来回收复合膜，该解吸循环可以从膜上去除100％的吸附金属离子。因此，已经开发了用于重金属离子去除的低成本，安全和有效的途径。

著录项

  • 作者

    Guan, Si Hui.;

  • 作者单位

    State University of New York at Stony Brook.;

  • 授予单位 State University of New York at Stony Brook.;
  • 学科 Chemistry Inorganic.;Engineering Chemical.;Chemistry Polymer.
  • 学位 M.S.
  • 年度 2012
  • 页码 77 p.
  • 总页数 77
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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