由于纤维素具有热稳定性差、化学稳定性差、易吸水、易受菌虫和微生物侵害等缺点,有必要对其进行化学改性处理。本文简述了原子转移自由基聚合(atom transfer radical polymerization,ATRP)方法在纤维素表面改性方面的应用情况及最新研...由于纤维素具有热稳定性差、化学稳定性差、易吸水、易受菌虫和微生物侵害等缺点,有必要对其进行化学改性处理。本文简述了原子转移自由基聚合(atom transfer radical polymerization,ATRP)方法在纤维素表面改性方面的应用情况及最新研究进展。综述了利用ATRP方法对纤维素表面进行改性的方法,利用ATRP方法在纤维素表面接枝不同功能性单体,赋予纤维素表面疏水性、抗菌性和刺激-响应性等多种功能性的研究概况及利用ATRP方法对天然纤维表面进行表面疏水、抗菌等功能改性以及在改善复合材料中纤维与基体间界面相容性方面的应用。最后,还介绍了ARGET ATRP(activators regenerated by electron transfer ATRP)方法由于具有大量减少铜用量,允许少量空气存在而且改性后纤维素易清洗等优点,有利于在纤维素改性工业中的推广应用。展开更多
Atom transfer radical polymerization of styrene initiated by α,α dibromotoluene and catalyzed by copper (I) bromide/2,2′ bipyridine was carried out.The produced polymers had narrow molecular weight distributions an...Atom transfer radical polymerization of styrene initiated by α,α dibromotoluene and catalyzed by copper (I) bromide/2,2′ bipyridine was carried out.The produced polymers had narrow molecular weight distributions and controlled molecular weights that were proportional to monomer conversion.In order to show that α,α dibromotoluene is a bifunctional initiator for atom transfer radical polymerization of styrene,polymerization of styrene using a mixture of 1 phenyl ethyl bromide and α,α dibromotoluene initiators was also carried out.The GPC trace of obtained polystyrene exhibited bimodal distribution.The peak appearing at lower elution time corresponds to polymer from α,α dibromotoluene and the other one corresponds to polymer from 1 phenyl ethyl bromide.The ratio of peak molecular weight of the polymer from α,α dibromotoluene to that from 1 phenyl ethyl bromide was found to be close to two,confirming that the polymer from α,α dibromotoluene grows from both ends of the polymer chain.Furthermore,the ratio of the two peak surface area changed with the molar ratio of α,α dibromotoluene to 1 phenyl ethyl bromide.展开更多
文摘由于纤维素具有热稳定性差、化学稳定性差、易吸水、易受菌虫和微生物侵害等缺点,有必要对其进行化学改性处理。本文简述了原子转移自由基聚合(atom transfer radical polymerization,ATRP)方法在纤维素表面改性方面的应用情况及最新研究进展。综述了利用ATRP方法对纤维素表面进行改性的方法,利用ATRP方法在纤维素表面接枝不同功能性单体,赋予纤维素表面疏水性、抗菌性和刺激-响应性等多种功能性的研究概况及利用ATRP方法对天然纤维表面进行表面疏水、抗菌等功能改性以及在改善复合材料中纤维与基体间界面相容性方面的应用。最后,还介绍了ARGET ATRP(activators regenerated by electron transfer ATRP)方法由于具有大量减少铜用量,允许少量空气存在而且改性后纤维素易清洗等优点,有利于在纤维素改性工业中的推广应用。
文摘Atom transfer radical polymerization of styrene initiated by α,α dibromotoluene and catalyzed by copper (I) bromide/2,2′ bipyridine was carried out.The produced polymers had narrow molecular weight distributions and controlled molecular weights that were proportional to monomer conversion.In order to show that α,α dibromotoluene is a bifunctional initiator for atom transfer radical polymerization of styrene,polymerization of styrene using a mixture of 1 phenyl ethyl bromide and α,α dibromotoluene initiators was also carried out.The GPC trace of obtained polystyrene exhibited bimodal distribution.The peak appearing at lower elution time corresponds to polymer from α,α dibromotoluene and the other one corresponds to polymer from 1 phenyl ethyl bromide.The ratio of peak molecular weight of the polymer from α,α dibromotoluene to that from 1 phenyl ethyl bromide was found to be close to two,confirming that the polymer from α,α dibromotoluene grows from both ends of the polymer chain.Furthermore,the ratio of the two peak surface area changed with the molar ratio of α,α dibromotoluene to 1 phenyl ethyl bromide.
