Polymer dispersed organic photochromic compounds and properties of thin films
|School||Huazhong University of Science and Technology|
|Course||Polymer Chemistry and Physics|
|Keywords||Photochromic film Polymer dispersion PMMA PS Spiropyran Pyrazolone DOP|
Film-forming method using the solution , respectively, of 8 - nitro-1 ', 3' , 3' - trimethyl- spiro indoline benzopyran (SP) and 1,3 - diphenyl-4 - m-chlorophenyl sub- methyl-5 - pyrazolone ketal N (4) - methyl - thiosemicarbazide (DP3ClBP-MTSC) dispersed in poly (methyl methacrylate) (PMMA) or polystyrene (PS) to prepare the polymerization dispersed organic photochromic compound thin film , the use of n-octyl phthalate (DOP) as a plasticizer, a light response speed control of film . The thermal properties of the films , mechanical properties and photochromic properties. The results showed that : SP-PMMA and SP-PMMA-DOP photochromic film and the heat is faster than achromatic SP-PS , and SP-PS-DOP photochromic film and thermal decoloring rate. Plasticizer DOP effectively improve the photochromic film and the thermal decoloring rate. Polymer-dispersed spiropyran photochromic film glass transition temperature of the polymer matrix than the glass transition temperature decreased, added DOP, the glass transition temperature is further reduced. SP-PMMA and SP-PMMA-DOP of tensile strength and elongation at break greater than SP-PS , and SP-PS-DOP of tensile strength and elongation at break . Hand [DP3ClBP-MTSC]-PMMA and [DP3ClBP-MTSC]-PMMA-DOP photochromic film DP3ClBP-MTSC rates than their photochromic rate decreased 60 to 100-fold lower rate of heat achromatic 8-10 times . Plasticizer DOP can be improved photochromic film and thermal decoloring rate. DP3ClBP-MTSC content of 10 %, the glass transition temperature is above the polymer glass transition temperature of the substrate ; when DP3ClBP-MTSC content to 30 %, the glass transition temperature is below the polymer glass transition temperature of the substrate .