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    Title: Preparation and characterization of polyurethane–gold nanocomposites prepared using encapsulated gold nanoparticles
    Other Titles: 利用包覆型金奈米粒子形成聚胺基甲酸酯-金奈米複合材料的製備與分析
    Authors: Chang, Chao-Ching;Chang, Chung-Hsueh
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Gold nanoparticle;Nanocomposite;Polyurethane;Poly(ester urethane)
    Date: 2010-07
    Issue Date: 2011-09-27 15:48:02 (UTC+8)
    Publisher: Chichester: John Wiley & Sons Ltd.
    Abstract: Gold nanoparticles (GNPs) have been widely studied due to their unique properties. Although many research groups have developed the synthesis of GNPs using various polymers as stabilizing or reducing agents, the effects of GNPs on the structures and properties of polymer matrices have been less reported. We propose a new design for the preparation of polyurethane–gold (PU–Au) nanocomposites. 11-Mercapto-1-undecanol-coated GNPs acted as the chain extenders and reacted with isocyanates to form covalent bonds between PU and GNPs. PU–Au nanocomposites were successfully synthesized, and the effects of multifunctional GNPs on the structures, morphology and properties of poly(ester urethane) were investigated. Scanning electron microscopy images suggested the GNPs can be dispersed uniformly in the PU matrix. Maltese-cross of spherical crystals was observed in the PU–Au nanocomposites, and the size of the crystals decreased with an increase in gold content. As the gold content increased, the thermal decomposition temperature and the temperature of the maximum decomposition rate increased. The glass transition temperature, crystal melting temperature and melting enthalpy of the soft segment also increased progressively. The results showed that multifunctional GNPs concentrated hard segments and resulted in an increase of heterogeneous nucleation, phase separation and elasticity.
    由於特殊的性質,金奈米粒子已開始被廣泛地研究。雖然許多研究團隊已發展使用多種高分子為保護劑或還原劑來合成金奈米粒子,金奈米粒子對於高分子結構與性質的影響卻很少被報導。我們提出一種新的設計來製備聚胺基甲酸酯-金奈米複合材料,以11-硫黃醇-1-十一醇包覆的金奈米粒子為鏈延長劑與異氰酸鹽反應,形成胺基甲酸酯與奈米金之間的共價鍵結。在這個研究中,成功地合成聚胺基甲酸酯-金奈米複合材料,並研究具多官能基的金奈米粒子對聚酯類聚胺基甲酸酯的結構、型態及性質的影響。掃描式電子顯微鏡的影像顯示金奈米粒子均勻地分散在聚胺基甲酸酯基材中。在複合材料中觀察到代表球晶的馬爾他十字,且晶粒隨著金奈米粒子的含量增加而變小。隨著複合材料中金含量的上升,聚胺基甲酸酯的熱烈解溫度與最大裂解速率溫度均上升,軟鏈段的玻璃轉移溫度、結晶熔化溫度與熔化熱焓量亦均逐漸地上升。動態機械分析結果顯示具多官能基的金奈米粒子能集中聚胺基甲酸酯的硬鏈段,而導致聚胺基甲酸酯異質性成核、軟硬鏈段相分離的程度,以及材料在室溫下彈性的增加。
    Relation: Polymer International 59(7), pp.910-916
    DOI: 10.1002/pi.2805
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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