LANGMUIR MONOLAYERS OF AMPHIPHILIC COPOLYMERS OF ACRYLIC ACID

LANGMUIR MONOLAYERS OF AMPHIPHILIC COPOLYMERS OF ACRYLIC ACID AND STYRENE OBTAINED BY CONTROLLED RADICAL COPOLYMERIZATION Zotova O. S. , Zaytsev S. D. , Ludin D. V. , Kulikov E. E. , Dukova S. V. N. I. Lobachevsky Nizhniy Novgorod State University, Nizhniy Novgorod, Russia E-mail: oksana_zotova@myrambler. ru THE OBJECTS OF RESEARCH Amphiphilic copolymers of acrylic acid and styrene THE METHODS OF RESEARCH Studying of monolayers of copolymers PAA-PSt (statistic copolymer) PAA- PSt (gradiently copolymer) PAA- PSt (block-copolymer) PSt – PAA (block-copolymer) PAA- copolymer (block- gradiently copolymer) PSt - copolymer (block- gradiently copolymer) SINTHESIS AND CHARACTERISTICS OF THE POLYMERS Wetting • test liquids: H 2 O, CH 2 I 2; • leakage conditions; • Langmuir-Blodgett’s films on silicon Langmuir-Blodgett’s film scales KSVmini (Finland) with using the Wilhelmy plate: Conditionals of measurements: • solvents: CH 3 OH+CHCl 3 (1: 9); • polymers concentration- 0, 2 mg/ml; • subphase-H 2 O; • t=22ºC; • rate of compression: 10 mm/min; and quartz substrates; • the polar and dispersion components of the surface tension • were calculated by Rukenshteyn method Amphiphilc copolymers were synthesized by RAFT polymerization AA, St (initiator – AIBN (0. 005 mol/l, chain transfer agent – BDB, t=80°C) to 10% conversion with subsequent postpolymerization in the presence of monomers (St and AA). Copolymers PAA-PSt (statistic copolymer) F (АA) 0, 15 f (АA) 0, 34 Mw Mn Mw/Mn 246362 413156 1, 68 SURFACE PRESSURE-AREA ISOTHERMS PAA-PSt (statistic copolymer) Copolymers 0, 4 0, 55 144424 87665 PAA-PSt (gradiently copolymer) 0, 1 0, 24 42461 31058 PAA- PSt (gradiently copolymer) 0, 5 0, 61 39678 33456 1, 18 PAA- PSt (block-copolymer) 0, 15 0, 21 9425 7429 1, 268 PAA- PSt (block-copolymer) 0, 4 0, 36 PSt – PAA (block-copolymer) PAA- copolymer (block- gradiently copolymer) PSt - copolymer (block- gradiently copolymer) 0, 15 0, 4 0, 15 0, 63 0, 91 0, 44 22362 35869 41896 20683 30258 36541 1, 081 1, 19 1, 14 26078 24208 1, 077 0, 3 0, 5 24396 22510 1, 08 0, 15 0, 25 29503 27223 1, 084 0, 5 0, 48 47980 41243 1, 163 f (АA) Vspreading, mkl PAA-PSt (statistic copolymer) PAA-PSt (gradiently copolymer) PAA- PSt (block-copolymer) PSt – PAA (block-copolymer) PAA- copolymer (block- gradiently copolymer) PSt – copolymer (block- gradiently copolymer) PSt - copolymer (block- gradiently copolymer) 1, 36 F (АA) 0, 15 0, 4 0, 1 0, 5 0, 15 0, 4 0, 15 0, 34 0, 55 0, 24 0, 61 0, 21 0, 36 0, 63 0, 91 0, 44 80 80 100 150 100 100 m. H/m 35 48 43 39 48 47 38 34 51 А 2/molecule 11000 4800 1050 750 430 200 1100 870 470 0, 3 0, 5 80 46 600 0, 15 0, 25 100 50 600 0, 5 0, 48 80 40 1250 1, 65 π, A 0, SURFACE PROPERTIES Copolymers F (АA) f (АA) PAA-PSt (statistic copolymer) 0, 15 0, 34 CosƟ (H 2 O) 78, 7 PAA-PSt (statistic copolymer) PAA-PSt (gradiently copolymer) PAA- PSt (block-copolymer) PSt – PAA (block-copolymer) 0, 4 0, 55 70, 5 0, 15 0, 4 0, 24 0, 61 0, 21 0, 36 0, 63 0, 91 77, 55 79, 55 60, 6 56, 6 61, 9 56, 6 PAA- copolymer (block- gradiently copolymer) 0, 15 0, 44 88, 4 PAA- copolymer (block- gradiently copolymer) 0, 3 0, 5 79, 7 PSt - copolymer (block- gradiently copolymer) 0, 15 0, 25 0, 48 84, 36 81, 27 γsd 44. 4 1 41. 3 43. 4 42. 9 49. 7 48. 6 45. 4 43. 8 5 47. 7 5 44. 7 5 43. 1 42. 8 γsp γs 3. 2 47. 61 6. 96 48. 26 3. 75 3. 2 9. 2 11. 46 9. 8 13 47. 15 46. 1 58. 9 60. 06 55. 2 56. 87 1. 51 49. 26 2. 82 47. 57 1. 83 2. 7 44. 94 45. 47 CONCLUSION: In the course of this work amphiphilic copolymers of acryic acid with styrene were synthesized by controlled radical copolymerization and studied. REFERENCES: