Packing mode and conformational transition of alkyl side chains in N-alkylated poly(p-benzamide) comb-like polymer

Shi, Haifeng; Zhao, Ying; Zhang, Xiuqin; Zhou, Yong; Xu, Yizhuang; Zhou, Surong; Wang, Dujin; Han, Charles C.; Xu, Duanfu

doi:10.1016/j.polymer.2004.07.005

Cited by 84 publications

(87 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the reported T m of PABA 17 (with a 97% degree of substituents), prepared by alkylation of poly(p-benzamide) with sodium hydride, was 3 1C, which was unexpectedly lower than that of n-hexadecane (T m ¼22 1C). 40 The authors attributed this reason to the difficult packing of PABA 17 because of the bulky phenylene groups. However, in our case, PABA 17 (with a 100% degree of substituents) melts at 31 1C, which indicates that only a 3% deficit in the introduction of alkyl side chains significantly decreases side-chain crystallinity for PABA 17 .…”

Section: Thermal Properties Of Pabasmentioning

confidence: 99%

“…The heat of fusion per monomeric unit of PABA 17 determined by DSC was À36.8 J g À1 , which is comparable with the reported value of comb polyamides. 40,41 X-ray scattering study of PABAs The packing mode of PABA n was investigated using WAXD measurements. Figure 5 depicts the WAXD patterns and profiles with a reciprocal lattice of PABA n polymers.…”

Section: Thermal Properties Of Pabasmentioning

confidence: 99%

See 1 more Smart Citation

Direct condensation polymerization of N-alkylated p-aminobenzoic acid and packing of rigid-rod main chains with flexible side chains

Shibasaki

Abe

Sato

et al. 2010

Polym J

View full text Add to dashboard Cite

Direct condensation polymerization of N-alkylated p-aminobenzoic acid, in which methyl, propyl, butyl, pentyl, heptyl, octyl and heptadecyl substituents were used as the alkyl group, was performed using hexachloroethane, triphenylphosphine and pyridine as condensation reagents. Pale-yellow N-alkylated poly(p-benzamide) (PABA n ) polymers, where n is the number of carbon atoms of the alkyl side chain, were obtained in 46-87% yields with an inherent viscosity of 0.06-0.65 per 100 ml g À1 (conc. H 2 SO 4 , 30 1C). The structures of PABA n were identified using infrared, nuclear magnetic resonance and elemental analysis. PABA n with long alkyl side chains (n43) showed good solubility in chloroform, as well as conc. H 2 SO 4 and m-cresol. The glass transition temperature (T g ) of PABA n measured by differential scanning calorimetry gradually decreased with an increase in the length of the alkyl group. The endothermic peak corresponding to melting was observed for PABA n with n¼3, 4, 5 and 17 on DSC profiles. The wide-angle powder X-ray scattering of the polymer samples indicated that PABA n polymers with n¼0, 1, 3, 4, 5 and 17 were crystalline polymers. X-ray scattering profiles showed PABA n with n¼3, 4 and 5 crystallized in an orthorhombic lattice, whereas PABA 1 crystallized in a monoclinic lattice. PABA 17 crystallized in hexagonal packing at the long side chain with an interplanar spacing of 4.2 Å .

show abstract

Section: Thermal Properties Of Pabasmentioning

confidence: 99%

Section: Thermal Properties Of Pabasmentioning

confidence: 99%

Direct condensation polymerization of N-alkylated p-aminobenzoic acid and packing of rigid-rod main chains with flexible side chains

Shibasaki

Abe

Sato

et al. 2010

Polym J

View full text Add to dashboard Cite

show abstract

“…9). In an experimental study, it was shown that the closed packing was hindered by the presence of the bulky side-chains [36]. This result indirectly supports that the backbone becomes more dominant when the number of the repeating units of PPP and PPy increased.…”

Section: Resultsmentioning

confidence: 80%

A QSPR Study on the Physical Properties of Substituted Polypyrroles and Poly(paraphenylenes)

Yıldırım

Aksoy

Tüzün

et al. 2011

Designed Monomers and Polymers

View full text Add to dashboard Cite

In this study, a quantitative structure-property relationship (QSPR) study is carried out to estimate the physical properties of substituted polypyrrole (PPy) and polyparaphenylene (PPP). The effects of the substituted side-chains composed of ε-caprolactone, ethylene and styrene oligomers on the glass transition temperature, cohesive energy and dielectric constant of PPy and PPP are studied and the results are analyzed in terms of backbone structure, the type and the length of the side-chains. It is shown that the T g of the polymers can be lowered upon substitution of flexible side-chains. The cohesive energy is higly dependent on the the strength of the non-bonded interactions and it is increased by incorporation of flexible side-chains. The dielectric constant of the polymers is found to be increased depending on the polarizability and the dipole moment density of the side-chains.

show abstract

“…Since the discovery that PP conducts electricity when doped with oxidizing or reducing agents [4], a great deal of research has gone into the study of this material and its derivatives [5][6][7]. The effect of side chain chemistry and side chain length on the planarity of PP backbones has been extensively investigated by various groups [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…One of the most common methods for the synthesis of polyarylenes [14] is the cross-coupling of aryl halides and aryl boronic acids (Suzuki coupling) [11] that has several advantages, such as simplicity of the procedure and insensitivity of the reaction to moisture. Furthermore, this coupling reaction can be applied to monomers carrying functional groups [15].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of polyphenylenes with PCL or/and PSt side chains

Nur

Yurteri

Cianga

et al. 2007

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

Packing mode and conformational transition of alkyl side chains in N-alkylated poly(p-benzamide) comb-like polymer

Cited by 84 publications

References 34 publications

Direct condensation polymerization of N-alkylated p-aminobenzoic acid and packing of rigid-rod main chains with flexible side chains

Direct condensation polymerization of N-alkylated p-aminobenzoic acid and packing of rigid-rod main chains with flexible side chains

A QSPR Study on the Physical Properties of Substituted Polypyrroles and Poly(paraphenylenes)

Pyrolysis of polyphenylenes with PCL or/and PSt side chains

Contact Info

Product

Resources

About