Temperature-Dependent Dynamic Mechanical Analysis−Fourier Transform Infrared Study of a Poly(ester urethane) Copolymer

Wang, Haochuan; Aubuchon, Steven R.; Thompson, Darla Graff; Osborn, Jill C.; Marsh, Anderson L.; Nichols, William R.; Schoonover, Jon R.; Palmer, Richard A.

doi:10.1021/ma012135a

Cited by 32 publications

(14 citation statements)

References 18 publications

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“…This was further confirmed by the FT‐IR analysis [see Fig. (c,d)] that the neutral polymer exhibited strong β‐sheet hydrogen bonding whereas the cationic polymer lack hydrogen bonding in their

{NH}_{3}^{+} X^{-}

amine salt …”

Section: Self‐assembly Of Neutral and Cationic Polyestersmentioning

confidence: 60%

“…The peak belongs to –NH(COO(CH 3 ) 3 ) proton at 1.41 ppm completely disappeared on deprotection without changing the polymer backbone. The FT‐IR spectra of P‐12 showed –NH stretching vibration band at ν =3350 cm −1 with respected to –NH bond involved in the hydrogen bonding interaction Similarly, the –C = O stretching vibration band at ν =1722 cm −1 was observed for hydrogen bonding interaction [see Fig. (c)].…”

Section: Self‐assembly Of Neutral and Cationic Polyestersmentioning

confidence: 99%

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Melt polycondensation approach for reduction degradable helical polyester based on l‐cystine

Anantharaj

Jayakannan

2016

J. Polym. Sci. Part A: Polym. Chem.

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Melt polycondensation approach is developed for new classes of reduction responsive disulfide containing functional polyesters based on l‐cystine amino acid resources under solvent free process. l‐Cystine was converted into multi‐functional ester‐urethane monomer and subjected to thermoselective transesterification at 120 °C with commercial diols in the presence of Ti(OBu)4 to produce polyesters with urethane side chains. The polymers were produced in moderate to high molecular weights and the polymers were found to be thermally stable up to 250 °C. The β‐sheet hydrogen bonding interaction among the side chain urethane unit facilitated the self‐assembly of the polyester into amyloid‐like fibrils. The deprotection of urethane unit into amine functionality modified the polymers into water soluble cationic polyester spherical nanoparticles. The reduction degradation of disulfide bond was studied using DTT as a reducing agent and the high molecular weight polymers chains were found be chopped into low molecular weight oligomers. The cytotoxicity of cationic disulfide nanoparticle was studied in MCF‐7 cells and they were found to be biocompatible and non‐toxic to cells upto 50 μg/mL. The custom designed reduction degradable and highly biocompatible disulfide polyesters from l‐cystine are useful for futuristic biomedical applications. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 2864–2875

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{NH}_{3}^{+} X^{-}

amine salt …”

Section: Self‐assembly Of Neutral and Cationic Polyestersmentioning

confidence: 60%

Section: Self‐assembly Of Neutral and Cationic Polyestersmentioning

confidence: 99%

Melt polycondensation approach for reduction degradable helical polyester based on l‐cystine

Anantharaj

Jayakannan

2016

J. Polym. Sci. Part A: Polym. Chem.

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show abstract

“…Subtraction of the data measured from the two polarizations provides the in-phase and quadrature dichroic difference spectra. The validity of this approach has been verified by Wang et al [35] who demonstrated that the PEM method and the polarizer method for DIRLD measurements yield equivalent results.…”

Section: Spectrometermentioning

confidence: 86%

“…Peak ''shifts'' such as this can give rise to bipolar bands [35,36]. But it is hard to tell if this is the likely origin of the negative band 1726 cm À1 observed in Fig.…”

Section: Origins Of New Features In Dynamic 2d-ir Spectramentioning

confidence: 99%

Concerning the spectral resolution enhancement of dynamic 2D-IR

Huang

Chen

2009

Vibrational Spectroscopy

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“…Two dynamic measurements were conducted: one with the wire grid linear polarizer in a parallel orientation (relative to the strain direction) and one with the polarizer in a perpendicular orientation. Subtraction of the data measured from the two polarizations provides the dynamic infrared linear dichroism (DIRLD) spectra, as obtained by the photoelastic modulator method 22. From the DIRLD spectra, information regarding the reorientation of functional groups may be obtained, which is beyond the scope of this publication.…”

Section: Methodsmentioning

confidence: 99%

Viscoelastic behavior and submolecular level dynamic heterogeneity of hydrogen‐bonded polymer blends probed by dynamic FTIR spectroscopy

Huang

Liu

Sun

et al. 2009

J of Applied Polymer Sci

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Viscoelastic behavior and submolecular (functional group) level dynamic heterogeneity of hydrogen-bonded poly(vinyl phenol)/poly(methyl acrylate) (PVPh/PMA) blends were investigated by using dynamic FTIR spectroscopy. It has been found that the viscoelastic behaviors of the blends, measured by the dynamic (inphase and quadrature) spectra of both ''free'' and hydrogen-bonded carbonyl groups are dependent on the compositions, i.e., the T g of the blends, and the degree of hydrogen bonding between the two components. In all the blends studied, elastic response of the hydrogen-bonded carbonyl groups to the applied strain has been found. The free carbonyl groups respond differently to the applied strain in these blends. Essentially, elastic response of the free carbonyl groups to the applied strain is observed in blends with both a high T g and a higher fraction ($ 40%) of intermolecular hydrogen bonding between PVPh and PMA, and the submolecular level dynamic heterogeneity is suppressed. The free carbonyl group has a viscous component to its response, in blends having a lower fraction ($ 20%) of hydrogen bonds, even at temperatures well below the thermal T g of the blends, suggesting that there is a degree of submolecular level dynamic heterogeneity in these blends. Almost entirely viscous response of the free carbonyl group is found in blends whose T g is close to room temperature and fraction of PVPh/PMA hydrogen bonds is very low. The results reported here suggest that dynamic FTIR has considerable potential for studying specific interactions and viscoelastic behaviors in hydrogen-bonded polymer blends on submolecular level.

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Temperature-Dependent Dynamic Mechanical Analysis−Fourier Transform Infrared Study of a Poly(ester urethane) Copolymer

Cited by 32 publications

References 18 publications

Melt polycondensation approach for reduction degradable helical polyester based on l‐cystine

Melt polycondensation approach for reduction degradable helical polyester based on l‐cystine

Concerning the spectral resolution enhancement of dynamic 2D-IR

Viscoelastic behavior and submolecular level dynamic heterogeneity of hydrogen‐bonded polymer blends probed by dynamic FTIR spectroscopy

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