Three kinds of spirooxazine compounds (SP1~SP3) that have photochromic properties were designed and synthesized.They contain similar groups(CH2)n Br with different numbers of carbon.Compounds SP1~SP3-hPMMA were prepared by respectively reacting compounds SP1

SP2 and SP3

containing reactive CBr bond

with polymethyl methacrylate (PMMA) of different hydrolysis ratios.The structures of these target compounds were characterized by 1H-NMR and IR tests.The photochromic properties and factors that influence photochromic properties of the SP1~SP3 and SP1~SP3-PMMA were investigated.The influences of hydrochloric acid concentration and PMMA of different hydrolysis ratios on photochromic properties and thermal stability of target compounds were studied.The results show that compound SP3 with a longer carbon chain has better photochromic properties and thermal stability than compounds SP1 and SP3.Moreover

the fading rate of SP-hPMMA is obviously lower than that of SP.With the increase of hydrochloric acid amount

SP-5%hPMMA maximum absorption and fading time increase.HCl further enhances the thermal stability of SP-hPMMA.Especially

SP3~9%hPMMA has the best photochromic properties and thermal stability in comparision with the others.Properties of films of SP-PMMA were also studied.Above all

it is expected that SP-9%hPMMA will be applied in the field of polymer photochromic materials.