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首页> 外文会议>American Chemical Society >Fluorescence Studies of Cellulose Ethers Synthesis, Characterization, and Spectroscopic Properties of Labeled Polymers
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Fluorescence Studies of Cellulose Ethers Synthesis, Characterization, and Spectroscopic Properties of Labeled Polymers

机译：纤维素醚的荧光研究合成，表征和标记聚合物的光谱性能

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摘要

Examples are given of the use of pyrene-labeled polymers as models for the study of solution properties ofhydrophohically modified polymers acting as gelling agents or associative thick-eners in waterborne fluids. Labeled polymers were obtained from three commercial cellulose ethers: Tylose M-300 (hydroxy-ethylmethylcellulose), Methocel-50-F (hydroxypropylmethyl-cellulose), and Klucel-L (hydroxypropylcellulose). The poly-mers contain on average one to five pyrene groups per chain. Procedures for labeling, purification, and characterization of the polymers are described, Spectroscopic parameters such as pyrene excimer-to-monomer intensity ratios, absorption spec-tra, excitation spectra, and excited-state lifetimes are reported for solutions of the polymers in water and in an organic me-dium (dichloromethane-methanol). These parameters present evidence that in water pyrene groups form hydrophobic clus-ters that are destroyed at the temperature corresponding to the cloud point. These clusters form in samples that undergo heat-induced phase separation, such as pyrene-labeled hydroxypro-pylcellulose in water.
机译：实施例中给出的使用芘标记的聚合物作为模型溶液性质的研究的ofhydrophohically改性作为胶凝剂或水性流体缔厚eners聚合物。 ，甲基纤维素-50-F（羟丙基甲基纤维素），和的Klucel-L（羟丙基纤维素）的Tylose M-300（羟基乙基甲基）：从三个商业纤维素醚，得到标记的聚合物。聚聚物平均包含一个到每个链五个芘组。用于标记，纯化，并且被所述的聚合物的表征程序，光谱参数如芘受激准分子与单体强度比，吸收光谱，激发光谱和激发态寿命报道了在水中的聚合物的溶液和在有机ME-dium（二氯甲烷 - 甲醇）。这些参数存在的证据表明，在水中芘基团形成在对应于该浊点的温度破坏疏水性的CLU-TER值。这些集群形成在经历热诱导相分离的样品，例如在水芘标记hydroxypro-pylcellulose。

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