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首页> 美国卫生研究院文献>Polymers >Surface-Initiated Initiators for Continuous Activator Regeneration (SI ICAR) ATRP of MMA from 2266–tetramethylpiperidine–1–oxy (TEMPO) Oxidized Cellulose Nanofibers for the Preparations of PMMA Nanocomposites
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Surface-Initiated Initiators for Continuous Activator Regeneration (SI ICAR) ATRP of MMA from 2266–tetramethylpiperidine–1–oxy (TEMPO) Oxidized Cellulose Nanofibers for the Preparations of PMMA Nanocomposites

机译：用于2266-四甲基哌啶-1-氧基（TEMPO）氧化纤维素纳米纤维的MMA连续活化再生（SI ICAR）ATRP的表面引发剂用于制备PMMA纳米复合材料

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摘要

An effective method of oxidation from paper pulps via 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) compound to obtain TEMPO-oxidized cellulose nanofibers (TOCNs) was demonstrated. Following by acylation, TOCN having an atom transfer radical polymerization (ATRP) initiating site of bromoisobutyryl moiety (i.e., TOCN–Br) was successfully obtained. Through a facile and practical technique of surface-initiated initiators for continuous activator regeneration atom transfer radical polymerization (SI ICAR ATRP) of methyl methacrylate (MMA) from TOCN–Br, controllable grafting polymer chain lengths ( = ca. 10k–30k g/mol) with low polydispersity (PDI < 1.2) can be achieved to afford TOCN– –Poly(methyl methacrylate) (PMMA) nanomaterials. These modifications were monitored by Fourier-transform infrared spectroscopy (FT–IR), scanning electron microscopy (SEM), electron spectroscopy for chemical analysis (ESCA), and water contact angle analysis. Eventually, TOCN– –PMMA/PMMA composites were prepared using the solvent blending method. Compared to the pristine PMMA ( = 100 °C; tensile strength ( ) = 17.1 MPa), the composites possessed high transparency with enhanced thermal properties and high tensile strength ( = 110 °C and = 37.2 MPa in 1 wt% TOCN containing case) that were investigated by ultraviolet-visible spectroscopy (UV-Vis), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and tensile tests. We demonstrated that minor amounts of TOCN– –PMMA nanofillers can provide high efficacy in improving the mechanical and thermal properties of PMMA matrix.
机译：证明了一种有效的纸浆氧化方法，可通过2,2,6,6-四甲基哌啶-1-氧基（TEMPO）化合物获得TEMPO氧化的纤维素纳米纤维（TOCN）。酰化后，成功获得具有溴异丁酰基部分（即TOCN-Br）的原子转移自由基聚合（ATRP）起始位点的TOCN。通过一种简便实用的表面引发剂进行连续活化剂再生，从TOCN-Br进行甲基丙烯酸甲酯（MMA）的原子转移自由基聚合（SI ICAR ATRP），可控制的接枝聚合物链长（=约10k-30k g / mol ）可实现低多分散性（PDI <1.2）以提供TOCN- –聚（甲基丙烯酸甲酯）（PMMA）纳米材料。通过傅立叶变换红外光谱（FT-IR），扫描电子显微镜（SEM），化学分析电子光谱（ESCA）和水接触角分析来监测这些修饰。最终，使用溶剂共混方法制备了TOCN– –PMMA / PMMA复合材料。与原始PMMA（= 100°C;抗张强度（）= 17.1 MPa）相比，该复合材料具有较高的透明度，并具有增强的热性能和较高的抗张强度（在1 wt％含TOCN的情况下为110°C和= 37.2 MPa）通过紫外可见光谱（UV-Vis），热重分析（TGA），动态力学分析（DMA）和拉伸试验对这些材料进行了研究。我们证明了少量的TOCN––PMMA纳米填料可以在改善PMMA基体的机械性能和热性能方面提供很高的功效。

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