Grafting parameters and surface free energy components of photosensitive poly(methacrylated spiropyran) brushes

Mutluturk E., ÇAYKARA T.

JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY, cilt.59, sa.4, ss.307-314, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 59 Sayı: 4
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1080/10601325.2022.2033124
  • Dergi Adı: JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Biotechnology Research Abstracts, CAB Abstracts, Chimica, Communication Abstracts, Compendex, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.307-314
  • Anahtar Kelimeler: Spiropyran, surface free energy, polymer brush, smart materials, surface characterization, POLYMER BRUSHES, SILICON-WAFER, LIQUID MOTION, PHOTOCONTROL, MORPHOLOGY, FLAT
  • Gazi Üniversitesi Adresli: Evet

Özet

Poly(methacrylated spiropyran) (P(MMASP)) brushes on silicon wafers were synthesized using the interface-mediated RAFT polymerization of methacrylated spiropyran (MMASP) monomers to determine their grafting density and surface free energy changes during photoinitiation. The grafting parameters of P(MMASP) layers such as the grafting density (sigma), the radius of gyration (R-g) and average distance between polymer chains (D) were calculated. It is found that 1.25 P(MMASP) chains covered per nm(2) area of wafers, and the distance between chains was 1.0 nm which is smaller than doubled R-g, 1.1 nm. Thus, P(MMASP) chains overlapped each other and forced themselves to stretch away from the interface. We evaluated the surface free energy components of P(MMASP) brushes during photo initiation. Van Oss-Good method was used to calculate the surface free energy components of brushes. It is found that spiropyran (SP)-merocyanine (MC) system significantly influenced the surface energy components of P(MMASP) brushes. The electron acceptor and electron donor surface free energies of SP and MC form of P(MMASP) brushes were found as gamma(+)(s) =0.47 mJ m(-2),gamma(-)(s) =1.15 mJ m(-2) and gamma(+)(s) =0.85 mJ m(-2) gamma(-)(s) =10.25 mJ m(-2), respectively. It is concluded that MC form of P(MMASP) brushes possess high base character; whereas, SP forms have low base character.