【作者】 滕金娟； 李仲晓； 蒲嘉陵；

【Author】 Jinjuan Teng;Zhongxiao Li;Jialing Pu;Lab of Printing and Packaging Material and Technology,Beijing Institute of Graphic Communication;

【机构】 北京印刷学院印刷包装材料与技术实验室；

【摘要】 聚合物纳米粒子是在十二烷基硫酸钠(SDS)的参与下,有苯乙烯(ST),丙烯腈(AN)及苯甲酸(ECBA)通过两阶段的乳液聚合过程制备而成的,且该聚合物纳米粒子内部包含有最大吸收峰值在830nm附近的近红外吸收染料(IR-830)。通过两阶段的聚合过程之后,转化率可达到96%或更高。用这种方法制备的乳液稳定,沉淀量极少。该聚合物纳米颗粒是通TEM,DLS,UV,DSC和TGA表征的。有包覆了830nm的红外染料的乳液和少量的其他助剂制备而成的薄涂层,如果在合适的温度下,例如100℃或更低一些的温度下干燥涂层,这种聚合物纳米粒子将在图层中保持原来的形状,并且可观察到其清晰的轮廓。然而,一经成影像的红外激光曝光(曝光的能量大约是200mJ/cm~2),包有IR-830的聚合物纳米粒子就很容易的熔融。结果,涂层中曝光的区域坚固的附着在基底上,而且耐水洗,但是没有曝光的区域会很容易被水洗掉。更多还原

【Abstract】 Polymer nano-particles containing near infrared absorbing dye(maximum absorption at about 830 nm) were prepared by a two-staged emulsion copolymerization of styrene(ST),acrylonitrile(AN) and benzoic acid in the presence of sodium dodecyl sulfate.After the two-staged polymerization process,the conversion rate can be increased to 96%or higher.The emulsion was stable and little precipitation was observed.The prepared polymer nano-particle was characterized with TEM,UV-Vis spectroscopy,DSC and TGA.Thin coatings were prepared with the IR830-containing emulsion and a small amount of other additives.The polymer nano-particles in the coating would keep the original structure and clear outline could be observed provided that the coating was dried at a proper temperature,such as at 100℃ or at a lower temperature.However,the infrared dye-containing polymer nano-particles would be readily fused under image-wise ER.laser exposure(exposure dose:200 mJ/ cm~2).As a result,the laser exposed areas of the coating firmly adhered to the substrate and showed enough resistance to water flushing,whereas the non-exposed areas were easy to develop.更多还原