牙线结构及热变性研究

Study on theStructure and Thermal Denaturation of Dental Floss

采用中红外(MIR)光谱(包括:一维MIR光谱、二阶导数MIR光谱、四阶导数MIR光谱及去卷积MIR光谱)开展了牙线结构研究。牙线结构的红外吸收模式主要包括:ν_(CH-牙线)、ν_(C=O-牙线)、ν_(C=C-牙线)、β_(CH2-牙线)、γ_(CH2-牙线)、β_(CH-牙线)和γ_(CH-牙线),其主要化学结构为聚对苯二甲酸乙二醇酯(PET)。采用一维变温中红外(TD-MIR)光谱进一步开展了温度变化对于牙线结构影响的研究。在293 K~393 K的温度范围内,随着测定温度的升高,牙线结构ν_(C=O-牙线-一维)、β_(CH-牙线-一维)和γ_(CH-牙线-一维)对应的红外吸收强度均发生明显改变,并进一步进行了相关机理的研究。研究拓展了MIR光谱及TD-MIR光谱在重要的纤维材料(牙线)结构及热变性的研究范围。

The structure of dental floss was studied by middle infrared(MIR)spectroscopy including one-dimensional MIR spectroscopy,second derivative MIR spectroscopy,fourth derivative MIR spectroscopy and deconvolution MIR spectroscopy.The infrared absorption modes of dental floss structure mainly included ν_(CH-dental floss),ν_(C=O-dental floss),ν_(C=C-dental floss),β_(CH2-dental floss),γ_(CH2-dental floss),β_(CH-dental floss) and γ_(CH-dental floss),its main chemical structure was polyethylene terephthalate(PET).The influence of temperature change on dental floss structure was further studied by using one-dimensional temperature-dependent middle infrared(TD-MIR)spectroscopy.In the temperature range of 293K~393K,with the increase of the measuring temperature,the infrared absorption intensities corresponding to the dental floss structure ν_(C=O-dental floss-one dimension),β_(CH-dental floss-one dimension)and γ_(CH-dental floss-one dimension)changed significantly,and the related mechanism was further studied.The research scope of MIR and TD-MIR spectroscopy in the structure and thermal denaturation of important fiber materials(dental floss)was expanded.