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A Bottom-Up Synthesis of Vinyl-Cellulose Nanosheets and Their Nanocomposite Hydrogels with Enhanced Strength
Biomacromolecules ( IF 5.5 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1021/acs.biomac.7b01224 Jianquan Wang 1, 2 , Jiabao Niu 1 , Toshiki Sawada 2 , Ziqiang Shao 1 , Takeshi Serizawa 2
Biomacromolecules ( IF 5.5 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1021/acs.biomac.7b01224 Jianquan Wang 1, 2 , Jiabao Niu 1 , Toshiki Sawada 2 , Ziqiang Shao 1 , Takeshi Serizawa 2
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Extracted nanocellulose from natural resources commonly requires modification before it is used as an effective nanofiller. In the present study, through an enzymatic polymerization of α-d-glucose 1-phosphate from the primer 2-(glucosyloxy)ethyl methacrylate (GEMA), a novel type of two-dimensional methacrylate-containing cellulose nanosheets (CNS) with a thickness of about 6 nm, named as GEMA-CNS, was directly synthesized under a mild condition by a “bottom-up” method. The structure and morphology of GEMA-CNS were characterized by 1H-nuclear magnetic resonance (NMR), matrix-assisted laser desorption/ionization time-of-flight mass spectra (MALDI-TOF MS), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and atomic force microscopy (AFM). Afterward, the obtained GEMA-CNS was covalently incorporated into poly(ethylene glycol) matrix through thiol–ene Michael addition, fabricating a series of GEMA-CNS-based nanocomposite hydrogels. The addition of GEMA-CNS effectively improved the mechanical strength and altered the internal network structures of hydrogels; additionally, the swelling/biodegradation behaviors of gels in phosphate buffer saline (pH 7.4) at 37 °C were affected to some degree. This species of property-tunable hydrogels with GEMA-CNS dosage demonstrates potential applications in tissue engineering. The current presentation opens a new road for direct enzymatic preparation of reactive nanocellulose and its novel applications in nanocomposite materials.
中文翻译：
自底向上合成乙烯基纤维素纳米片及其强度增强的纳米复合水凝胶
从自然资源中提取的纳米纤维素通常需要进行修饰，才能用作有效的纳米填料。在本研究中，通过从底漆2-（葡糖氧基）甲基丙烯酸乙酯（GEMA）酶促聚合α - d-葡萄糖1-磷酸，一种新型的具有一定厚度的二维含甲基丙烯酸的纤维素纳米片（CNS）通过“自下而上”的方法在温和条件下直接合成了约6 nm的GEMA-CNS。GEMA-CNS的结构和形态由1表征H核磁共振（NMR），基质辅助激光解吸/电离飞行时间质谱（MALDI-TOF MS），傅里叶变换红外（FTIR）光谱，X射线衍射（XRD），透射电子显微镜（ TEM和原子力显微镜（AFM）。然后，将获得的GEMA-CNS通过硫醇-烯迈克尔加成共价结合到聚乙二醇中，从而制造出一系列基于GEMA-CNS的纳米复合水凝胶。GEMA-CNS的添加有效地提高了机械强度，并改变了水凝胶的内部网络结构；此外，凝胶在37°C的磷酸盐缓冲盐水（pH 7.4）中的溶胀/生物降解行为受到一定程度的影响。具有GEMA-CNS剂量的这种性质可调的水凝胶证明了在组织工程中的潜在应用。
更新日期：2017-11-05
中文翻译：
自底向上合成乙烯基纤维素纳米片及其强度增强的纳米复合水凝胶
从自然资源中提取的纳米纤维素通常需要进行修饰，才能用作有效的纳米填料。在本研究中，通过从底漆2-（葡糖氧基）甲基丙烯酸乙酯（GEMA）酶促聚合α - d-葡萄糖1-磷酸，一种新型的具有一定厚度的二维含甲基丙烯酸的纤维素纳米片（CNS）通过“自下而上”的方法在温和条件下直接合成了约6 nm的GEMA-CNS。GEMA-CNS的结构和形态由1表征H核磁共振（NMR），基质辅助激光解吸/电离飞行时间质谱（MALDI-TOF MS），傅里叶变换红外（FTIR）光谱，X射线衍射（XRD），透射电子显微镜（ TEM和原子力显微镜（AFM）。然后，将获得的GEMA-CNS通过硫醇-烯迈克尔加成共价结合到聚乙二醇中，从而制造出一系列基于GEMA-CNS的纳米复合水凝胶。GEMA-CNS的添加有效地提高了机械强度，并改变了水凝胶的内部网络结构；此外，凝胶在37°C的磷酸盐缓冲盐水（pH 7.4）中的溶胀/生物降解行为受到一定程度的影响。具有GEMA-CNS剂量的这种性质可调的水凝胶证明了在组织工程中的潜在应用。
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