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首页> 外文期刊>Macromolecules >STUDY OF THE CORE-SHELL NANOPARTICLE FORMED THROUGH THE COIL-TO-GLOBULE TRANSITION OF POLY(N-ISOPROPYLACRYLAMIDE) GRAFTED WITH POLY(ETHYLENE OXIDE)
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STUDY OF THE CORE-SHELL NANOPARTICLE FORMED THROUGH THE COIL-TO-GLOBULE TRANSITION OF POLY(N-ISOPROPYLACRYLAMIDE) GRAFTED WITH POLY(ETHYLENE OXIDE)

机译：接枝聚环氧乙烷的聚（N-异丙烯酰基丙烯酰胺）的螺旋转变成球壳纳米粒子的研究

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A combination of static and dynamic laser light scattering (LLS) was used to study the ''coil-to-globule'' transition of poly(N-isopropylacrylamide) grafted with poly(ethylene oxide) (PNIPAM-g-PEO) in water. Two PNIPAM-g-PEO samples (M-w = 7.29 x 10(6) and 7.85 x 10(5) g/mol) were prepared by free radical copolymerization of N-isopropylacrylamide and poly(ethylene oxide) macromonomers end-capped with methacrylate (M-w = similar to 7000-8000) in water. At room temperature, PNIPAM-g-PEO in water exists as individual chains. When the temperaturte is higher than similar to 32 degrees C, the PNIPAM-g-PEO chain backbone undergoes the intrachain ''coil-to-globule'' transition and the interchain aggregation to form nanoparticles with a hydrophobic PNIPAM core and a soluble hydrophilic PEO shell. The nanoparticle size decreases as the average number of PEO chains grafted on the PNIPAM chain backbone increases. A lower copolymer concentration and a fast heating rate can also lead to smaller nanoparticles. With a proper control of the formation conditions, we were able to suppress the interchain aggregation to prepare and study a single chain core-shell nanostructure. [References: 23]
机译：静态和动态激光散射（LLS）的组合用于研究水中接枝聚环氧乙烷（PNIPAM-g-PEO）的聚（N-异丙基丙烯酰胺）的“线圈到球”过渡。通过N-异丙基丙烯酰胺和甲基丙烯酸酯封端的聚（环氧乙烷）大分子单体的自由基共聚制备两个PNIPAM-g-PEO样品（Mw = 7.29 x 10（6）和7.85 x 10（5）g / mol）。 Mw =类似于7000-8000的水。在室温下，水中的PNIPAM-g-PEO作为单个链存在。当温度高于类似于32°C的温度时，PNIPAM-g-PEO链主链会经历链内``线圈到球''过渡和链间聚集，形成具有疏水性PNIPAM核心和可溶性亲水性PEO的纳米粒子贝壳。随着接枝到PNIPAM链骨架上的PEO链的平均数目的增加，纳米粒子的尺寸减小。较低的共聚物浓度和较快的加热速率也可以导致较小的纳米颗粒。通过适当控制形成条件，我们能够抑制链间聚集，从而制备和研究单链核-壳纳米结构。 [参考：23]

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