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Novel D‐ and T‐functionalized Polysiloxane Matrices for Reactions in Interphases
Author(s) -
Lindner Ekkehard,
Salesch Thomas,
Hoehn Frank,
Mayer Hermann A.
Publication year - 1999
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(199912)625:12<2133::aid-zaac2133>3.0.co;2-7
Subject(s) - hydrosilylation , chemistry , monomer , silane , polymer , proton nmr , oxygen atom , polymer chemistry , crystallography , silicon , condensation , condensation reaction , stereochemistry , catalysis , organic chemistry , molecule , physics , thermodynamics
New hydrocarbon bridged co‐condensation agents of the type RSi(OMe) 2 (CH 2 ) z C 6 H 4 (CH 2 ) z (OMe) 2 SiR { 3[Ph(1,4‐C 3 D 0 ) 2 ] , z = 3, R = Me; 3[Ph(1,4‐C 3 T 0 ) 2 ] , z = 3, R = OMe; 4[Ph(1,4‐C 3 D 0 ) 2 ] , z = 4, R = Me} were synthesized by hydrosilylation of the corresponding α,ω‐dienes CH 2 =CH–(CH 2 ) z–2 –C 6 H 4 –(CH 2 ) z–2 –CH=CH 2 [z = 3 ( 1 ), 4 ( 2 )] with HSiR(OMe) 2 (R = Me, OMe). These silane monomers were sol‐gel processed, partially with MeSi(OMe) 3 ( T 0 ) to give the polysiloxanes 3 a , 3 b , 4 c , 3 d , 3 e , 4 f , and 3 ab (Table 1, Schemes 2 and 3); D = D type silicon atom (two oxygen neighbors), T = T type of silicon atom (three oxygen neighbors). The relative amounts of T and D silyl species and the degrees of condensation were determined by 29 Si and 13 C CP/MAS NMR spectroscopic investigations. 29 Si and 13 C CP/MAS NMR relaxation time studies ( T SiH , T CH , T 1ρH ), and 2 D WISE NMR experiments were applied to get knowledge about the polymer dynamics. For the first time protons of such polysiloxane systems were detected by 1 H SPE/MAS NMR measurements in suspension. Mobility studies were carried out in different solvents. Furthermore the swelling capacities of the polymers 3 a , 3 b , and 4 c in different solvents and the BET surface areas of all materials were investigated. SEM micrographs show the morphology of 3 a and 3 b .