Study on the preparation and properties of novel block copolymeric materials based on structurally modified organometallic as well as organic polyamides and polydimethylsiloxane

Abstract

Some novel ferrocene‐containing polyamide‐based block copolymer materials with telechelic polydimethylsiloxane oligomer and their organic analogues were prepared by solution‐phase polycondensation of ferrocene‐based organometallic and terephthaloyl‐ as well as isophthaloyl‐based organic acyl chlorides with a series of semi‐aromatic diamines having ether linkages together with variable aliphatic character. The corresponding polyamides of the synthesized materials, without polydimethylsiloxane segment, were also prepared for comparison of physicochemical properties. None of the synthesized organometallic and organic block copolymers along with their respective polyamides melted below 300 °C and their structural features were confirmed by their physical properties and spectroscopic studies. The weight‐average molecular weights and molecular parameters of all these materials were determined by the static laser light scattering technique. The materials were soluble in sulfuric acid and partially soluble in common organic solvents, and yet became readily soluble upon N‐trifluoroacetylation. The synthesized materials were further characterized by their water absorption characteristics, X‐ray diffraction studies and surface morphology (SEM and AFM) and thermal (DSC and TG) analyses, and their structure–property relationships were elucidated from these studies. The energies of pyrolysis for these materials were calculated by the Horowitz and Metzger method. © 2012 Society of Chemical Industry

Silicone containing copolymers: Synthesis, properties and applications

“…All copolymers displayed very high melting points above 300 °C. TEM and AFM studies confirmed the formation of multiphase morphologies (191).The same group also reported the synthesis of high molecular weight PDMS-polyamide segmented copolymers which also contained trichlorogermyl pendant groups by using one-pot solution polycondensation reactions (192). The copolymers obtained were characterized by spectroscopic (FTIR and NMR) techniques, SEM and DSC analyses.…”

“…The preparation and characterization of PDMS-amide segmented copolymers containing ferrocene groups was reported (191). Very high molecular weight copolymers with <M n > values in 4.3x10 6 to 7.8x10 6 g/mol were prepared in solution using terephthaloyl or isophthaloyl chlorides, aromatic diamine chain extenders and aminopropyl terminated PDMS oligomer with and <M n > value of 27,000 g/mol.…”

Amide-containing segmented copolymers

“…A number of PDMS-PA segmented copolymers were reported that included organometallic structural features. For example, two PDMS-PA copolymers containing pendent trichlorogermyl or ferrocene groups both exhibited good thermal and mechanical properties for use as protective coatings [122,123]. However, a majority of the research conducted on PDMS-PA copolymers included PDMS poly(aramid) (PDMS-PAr) segmented copolymers that Imai et al introduced in 1989 [124].…”

Effect of polydimethylsiloxane incorporation on the properties of polyimides synthesized from newly designed α,α'-bis(2-aminophenoxy)-p-xylene

“…SLLS measures light intensity as a function of scattering angle and solute concentration and the relationship between the light scattering from a dilute polymer solution and the weight-average molecular weight can be described by the Zimm formalism. This allows the determination of weightaverage molecular weight, radius of gyration and shape information of the solute [37]. The results revealed that copolyimide 6FDA-2APX-PDMS have higher molecular weight than corresponding polyimides (6FDA-2APX).…”