Light refractive index modulation polymer, light refractive index modulation polymer composition and method of controlling refractive index
A technology of refractive index modulation and polymers, applied in the field of adjusting their refractive index, can solve the problems of complicated steps, impossible to increase the refractive index, and a lot of time
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Embodiment 1
[0118] (synthetic catalyst)
[0119] The catalyst for anionic coordination polymerization was synthesized in the following manner.
[0120] Into a 1-liter flask whose atmosphere has been replaced by argon, introduce 3.9616 g of SmI 2 and 330 mL tetrahydrofuran. Under stirring, 45.858 grams of potassium pentamethylcyclopentadienyl salts [(C 5 Me 5 )K]. The mixture was reacted at room temperature. Thereafter, THF was removed under reduced pressure, and toluene was added to the residual solid matter. The supernatant was recovered and vacuum-dried. Then, [(C 5 Me 5 ) 2 Sm(THF) 2 ) for recrystallization. 2.5g of the [(C 5 Me 5 ) 2 Sm(THF) 2 ] was dissolved in 60 mL of toluene. Thereto was added 2.2 mL of triethylaluminum. The mixture was reacted with stirring. The resulting precipitate was removed, followed by recrystallization to obtain (C 5 Me 5 ) 2 SmMe(THF).
[0121] (Synthetic PVMA)
[0122] 80 mL of well-dried and vented toluene was introduced into the ...
Embodiment 2
[0138] (Synthesis of random copolymers of VMA and another monomer)
[0139] Using the catalyst synthesized in Example 1, a random copolymer of vinyl methacrylate (VMA) and methyl methacrylate (MMA) was synthesized.
[0140] Introduce 50 mL of well-dried and vented toluene into the Schlenk tube from which water and air have been sufficiently removed. To which has been added with CaH 2 After drying, 7.5 mL (7.0 g; 62.4 mmol) of purified VMA and 7.5 mL (7.0 g; 70.1 mmol) of MMA were then distilled. After adjusting the internal temperature to -78 °C, 0.198 g (0.390 mmol) of (C 5 Me 5 ) 2 The resulting dilution of SmMe(THF) (as catalyst) was introduced into a Schienk tube to initiate polymerization. The catalyst was used in such an amount that the monomer / catalyst ratio was 160 (VMA) and 180 (MMA), and the theoretical molecular weight was set at about 36,000. The reaction mixture was reacted at a polymerization temperature of -78°C for 3 hours. Thereafter, methanol was added...
Embodiment 3
[0149] (Synthesis of random copolymers of VMA and another monomer)
[0150] In the same method as in Example 2, the synthesis of the copolymer was carried out, except that the monomer composition was changed so that it was composed of 10mL (83.2mmol) VMA and 2.8mL (16.64mmol) N', N'-dimethylamino Ethyl methacrylate (DMMA), and (C 5 Me 5 ) 2 The amount of SmMe(THF) and toluene was changed to 0.095 g (0.187 mmol) and 51 mL. Thus, a VMA / DMMA random copolymer is obtained.
[0151] The copolymerization ratio (mole percentage) of VMA / DMMA in the polymer is 83:17. The amount of polymer produced was 5.45 g (yield, 45.6% by weight). Its number average molecular weight (Mn) and weight average molecular weight (Mw) measured by GPC were 65,000 and 91,600, respectively, and its molecular weight distribution (Mw / Mn) was 1.41. In addition, according to 1 H-NMR spectroscopy determined that the percentage of radically polymerizable vinyl side chains remaining in the polymer was 100%...
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