Comparison of Properties of Silicon-containing Poly(amide-imide)s

Sava, Ion; Brumă, Maria; Schulz, Burkhard; Köpnick, Thomas

doi:10.1177/0954008305044162

Cited by 11 publications

(13 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1). All acid dichlorides obtained decompose when they are distilled over 80 ºC (2)(3)(4)(5) approximately. For this reason, characterization and polymerization were developed from the crude portion.…”

Section: Resultsmentioning

confidence: 99%

“…The mixture was hydrolyzed with 30 mL of 5% HCl solution. The organic layer was separated, washed several times with water and dried with anhydrous MgSO 4 -Bis(4-carboxyphenyl)R 1 R 2 silane and bis(4-carboxyphenyl)R 1 R 2 germane…”

Section: Synthesis and Characterization Of Acid Dichlorides And Theirmentioning

confidence: 99%

“…The bis(p-tolyl) derivatives were oxidized to the bis(4-carboxyphenyl) derivatives according to the following procedure: bis(p-tolyl) derivative (1.0 g) was mixed with 60 mL of pyridine and 40 mL of water and refluxed at 80 C. 10 g of KMnO 4 were added in portions. The MnO 2 was filtered and the diacid was precipitated with HCl (c), washed and dried.…”

Section: Synthesis and Characterization Of Acid Dichlorides And Theirmentioning

confidence: 99%

“…The introduction of silane links such as -SiR 1 R 2 -in the main chain, improve the solubility and increase the glass transition temperature in front of wholly aromatic polymers. M. Bruma has described several kinds of Si-containing condensation polymers with different functional groups and studied their properties [2][3][4][5][6]. Also, the lower electronegativity of the Si atom with respect to the C one would imply an increase of the thermal stability due to an ionic character of the C-Si bond when compared with the C-C ones, in spite of the similar bond energy dissociation of both bond [2,7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Poly(amide) oligomers with silarylene and/or germarylene units – synthesis, characterization and thermal studies

et al. 2009

View full text Add to dashboard Cite

Ten poly(amide) oligomers were prepared from four acid dichlorides and two full-aromatic diamines, the latter containing silicon or germanium in their structure. The polymers, which contain Et/Me, Et/Et and n Bu/ n Bu combinations on heteroatom of the acid dichloride moiety, were characterized by spectroscopic techniques, including 29 Si NMR. The yields obtained and the nh values established were low, indicating the low molecular weight nature of the polymers. Thermal stability was also evaluated by TG and DSC techniques. When a methyl group was replaced by a Et, the T g of the poly(amides) (PAs) was increased in accordance with the gain in the flexibility of the chain. However and in general terms, the PAs with n Bu groups show the inverse effect. Probably, the possibility of an effective interaction between these side chains affects negatively the flexibility of the main chain. On the other hand, PAs that contain single silicon in their structure show lower T g values than the Ge-containing PAs. For the other heteroatom combinations, similar results were obtained. This fact does not agree with the lower size of silicon atom which should increase the molecular rigidity and therefore their T g values. Probably, the influence of the side groups is decisive in hindering the chain rotation. The thermal degradation temperature (TDT) changed in agreement with the packing factor of the chains which was depending on the size of substitute groups. So, when Et group was replaced by n Bu as lateral group, lower TDT were recovered. With respect to the heteroatoms used in the main chain, the TDT values do not show a clear tendency.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Synthesis and Characterization Of Acid Dichlorides And Theirmentioning

confidence: 99%

Section: Synthesis and Characterization Of Acid Dichlorides And Theirmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Poly(amide) oligomers with silarylene and/or germarylene units – synthesis, characterization and thermal studies

et al. 2009

View full text Add to dashboard Cite

show abstract

“…On the other hand, poly(imide-amides) are alternative materials, which offer the thermal stability of the poly(imides) and the solubility and processability of the poly(amides) (6)(7)(8).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Thermal Studies of Wholly Aromatic Poly(imide-Amides) Containing Si and/or Ge in the Main Chain

Tagle

Terraza

Ortiz

et al. 2011

J. Chil. Chem. Soc.

View full text Add to dashboard Cite

Poly(imide-amides) (PIAs) containing the heteroatoms Si and/or Ge in the main chain were obtained from diacids, which were synthesized from trimellitic anhydride and the diamines bis(4-aminophenyl)diphenylsilane or bis(4-aminophenyl)diphenylgermane. With the same diamines the polymers containing the heteroatoms Si and Ge in the main chain were obtained. Polymers were soluble in aprotic polar solvents and characterized by IR and 1 H, 13C and 29Si NMR spectroscopy, and the results were in agreement with the proposed structures. Low inherent viscosity values (h inh ) (0.04 -0.12 dL/g) were obtained, indicating the presence of oligomeric species. The Tg values were obtained by differential scanning calorimetry (DSC), and the results did not show a relation with the nature of the heteroatoms, in the sense that the polymers with Si should have higher Tg values than those with Ge due to the lower volume of the former atom. Also, the low values of h inh associated to low molecular weight species, have important influence on Tg values. The thermal decomposition temperatures were obtained by dynamic thermogravimetry. These analyses showed that the highest thermal decomposition temperature (TDT) values were obtained for PIA-II and PIA-III with Si and Ge in the repeating unit, and the lowest TDT values with two Si atoms in the unit.

show abstract

Poly(urethanes) containing silarylene and/or germarylene units

Terraza

Tagle

Leiva

et al. 2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

A series of 10 poly(urethanes) were synthesized by solution polymerization from bis(chloroformates) and aromatic diamines, containing both silicon or germanium as central atom. So, the polymers prepared contain two silicon atoms or two germanium atoms exclusively or combinations of both. Me, Et, and Ph groups were bonded to the central atoms according to the nature of the monomers employed. Poly(urethanes) were characterized by FTIR, 1 H, 13 C, and 29 Si NMR spectroscopy and the results agreed with the proposed structures. Additionally, intrinsic viscosity values were established in DMSO solutions and thermal analyses were developed. In all cases, thermostable oligomers were obtained, which showed a degradation process beginning at $240-2608C. Polymers showed a thermal dependence with the nature of the heteroatom employed. Thus, in general, when germanium was used as central atom, the thermal stability was higher than the polymers containing silicon which agrees with the lower polarity and higher energy of the CÀ ÀGe bond in comparison with the CÀ ÀSi one.

show abstract

Comparison of Properties of Silicon-containing Poly(amide-imide)s

Cited by 11 publications

References 18 publications

Poly(amide) oligomers with silarylene and/or germarylene units – synthesis, characterization and thermal studies

Poly(amide) oligomers with silarylene and/or germarylene units – synthesis, characterization and thermal studies

Synthesis, Characterization and Thermal Studies of Wholly Aromatic Poly(imide-Amides) Containing Si and/or Ge in the Main Chain

Poly(urethanes) containing silarylene and/or germarylene units

Contact Info

Product

Resources

About