Diacetylene polymerization in self-assembled monolayers: influence of the odd/even nature of the methylene spacer

Menzel, Henning; Horstmann, Sandra; Mowery, Mark D.; Cai, Mei; Evans, Christine

doi:10.1016/s0032-3861(00)00148-8

Cited by 61 publications

(84 citation statements)

References 47 publications

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“…This result sensibly differs from that obtained for the same polydiacetylene self-assembled onto sputtered gold layer, where the values of 2928 and 2855 cm À1 were measured for the corresponding stretching modes [9]. In the literature on PDA SAMs, the shift of these vibrations towards higher wavenumbers was associated to the presence of gauche defects in the chain conformation [10]. Gauche defects were found to be necessary to assure the polymer blue-phase formation, in that they are able to transfer away from the backbone the strain created by the hybridization changes in the polymerization process [11].…”

Section: Ft-ir Characterization Of Ds9-aunpscontrasting

confidence: 85%

Spectroscopical investigation on colloidal suspensions of diacetylene-capped gold nanoparticles

Alloisio

Demartini

Cuniberti

et al. 2008

Vibrational Spectroscopy

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Section: Ft-ir Characterization Of Ds9-aunpscontrasting

confidence: 85%

Spectroscopical investigation on colloidal suspensions of diacetylene-capped gold nanoparticles

Alloisio

Demartini

Cuniberti

et al. 2008

Vibrational Spectroscopy

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“…As reported previously, the appearance of elevated features is evidence of photopolymerization of PCDA. As noted above, red phase PDA and blue phase PDA are the two main phases reported . The difference between these two is the ability of the red phase to emit fluorescence upon excitation.…”

Section: Resultsmentioning

confidence: 81%

Insight into diacetylene photopolymerization in Langmuir‐Blodgett films using simultaneous AFM and fluorescence microscopy imaging

Araghi

Paige

2017

Surface & Interface Analysis

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A phase‐separated monolayer film comprised of a mixture of 10, 12‐pentacosadiynoic acid (PCDA) with perfluorotetradecanoic acid (PF; CF3(CF2)12COOH) has been characterized using a microscope that is capable of simultaneous atomic force microscope (AFM) imaging and fluorescence imaging. Design criteria for this instrument are described, as well as its application to investigating the mixed film systems. The product of PCDA photopolymerization has two phases, a red phase with strong fluorescence and a blue phase with no fluorescence. With the help of the dual AFM‐fluorescence microscope, it was found that both the red and the blue phase polymers were produced in the same sample from photoillumination, and the relative quantities of the different phases were quantified. Further, the importance of intrinsic mechanical stress in the films is discussed in terms of its influence on selectivity towards the red polymer phase.

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“…44 When the PDA is mixed with another polymer with flexible chains such as PEO and PU, the packing of rigid PDA chains and hence the formation crystal structure is likely interrupted, resulting in fair mechanical performance of the mixture such as the PEO-PDA and PU-PDA composite fibers. The high tensile strength and Young's modulus suggest that the PDA macromolecular chains are rigid.…”

Section: Afm Analysismentioning

confidence: 99%

Study on microstructure and mechanical properties of polydiacetylene composite biosensors

Hassan

Gentry‐Weeks

Reynolds

et al. 2019

J of Applied Polymer Sci

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10,12-Pentacosadiynoic acid (PCDA) monomers were mixed with polyurethane (PU) or poly(ethylene oxide) (PEO) and the mixtures were electrospun to obtain composite nanofibers that were then photopolymerized via ultraviolet radiation, resulting polydiacetylene (PDA) in the nanofibers. The PDA demonstrated color-changing properties in the presence of Escherichia coli, which exhibited potential for developing flexible colorimetric biosensors for medical textiles. Phase separation was found in the PEO-PDA fibers, resulting in amorphous PEO accumulation at the fiber surface. In contrast, the PU-PDA fibers demonstrated a homogeneous microstructure throughout the fibers. Tensile test results suggested a molecular orientation in the PU-PDA fibers that significantly improved the mechanical properties of the fibers. The presence of PDA in the matrix polymer reduced the overall strength and breaking elongation of both composite nanofibers in comparison to 100% PEO and PU fibers. A single PU-PDA fiber showed significantly higher stiffness and modulus than a single PEO-PDA fiber. Force-distance curve analysis suggested that the PU-PDA fibers exhibited an elastic deformation. In a comparison, the PEO-PDA fibers were brittle and showed low modulus. The results of structural and mechanical properties suggest that the PU-PDA nanofibers are a promising composite for developing nonadherent, durable, and flexible colorimetric biosensors used in medical textiles.

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Diacetylene polymerization in self-assembled monolayers: influence of the odd/even nature of the methylene spacer

Cited by 61 publications

References 47 publications

Spectroscopical investigation on colloidal suspensions of diacetylene-capped gold nanoparticles

Spectroscopical investigation on colloidal suspensions of diacetylene-capped gold nanoparticles

Insight into diacetylene photopolymerization in Langmuir‐Blodgett films using simultaneous AFM and fluorescence microscopy imaging

Study on microstructure and mechanical properties of polydiacetylene composite biosensors

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