Raman spectra of extended‐chain syndiotactic poly(vinyl chloride)

Koenig, Jack L.; Druesedow, D.

doi:10.1002/pol.1969.160070608

Cited by 16 publications

(7 citation statements)

References 5 publications

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“…5 The Raman spectra of normal and urea-complex PVC were studied by Koenig and Druesedow. 6 The results are in support of the infrared studies and are utilized in this paper also.…”

supporting

confidence: 85%

Normal-Coordinate Analysis of Poly(vinyl chloride) and Deuterated Analogs

Tasumi

Shimanouchi

1971

Polym J

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“…5 The Raman spectra of normal and urea-complex PVC were studied by Koenig and Druesedow. 6 The results are in support of the infrared studies and are utilized in this paper also.…”

supporting

confidence: 85%

Normal-Coordinate Analysis of Poly(vinyl chloride) and Deuterated Analogs

Tasumi

Shimanouchi

1971

Polym J

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“…The first reported Raman spectrum of syndiotactic poly(vinyl chloride) was determined by Koenig and Druesedow in 1969. 1 The observed results in Raman agreed well with previous normal coordinate analysis2 for infrared assignments. Sensitivity of the PVC sam-…”

supporting

confidence: 90%

A Note on Fractionation of Polymers by Thin Layer Chromatography

Inagaki¹,

Kamiyama²,

Yagi³

1971

Macromolecules

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Notes 133 polymer crystallization kinetics, giving results similar to conventional methods. No diluent effects1 23were noted, probably because the decane was mixed with the polymer in extremely small amounts and for an insignificant portion of the total crystallization time. Furthermore, crystallinity measurements using different probe molecules and column conditions gave essentially the same crystallinity for a given polymer sample.7 One useful feature of the method is that retention times may be measured easily to high precision. However, very accurate temperature control and carrier gas flow control are necessary to exploit the method's inherent sensitivity to small changes in crystallinity. Another advantage of this method is that very thin layers of polymer may be studied. (For this work the average coating thickness was less than 10-3 cm, assuming that all the glass surface was covered.) The effects of high surface-to-volume ratios and of different types of support surfaces on the rate of polymer crystallization are thus readily measurable.

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“…The major feature in this spectrum is the broad profile above 1425 cm −1 , due to the unresolved CH 2 scissoring vibration doublet in PVC, a major material component of the bag. 31 Additional bands in the spectrum in Fig. 2B (a) at ~1040, 1580 and 1600 cm −1 have been attributed to the phthalate plasticizer in PVC blood bags 24 Figure 2B (b) is the spectrum of a blood-filled segment acquired using conventional settings, i.e.…”

Section: Resultsmentioning

confidence: 99%

Non-invasive analysis of stored red blood cells using diffuse resonance Raman spectroscopy

Gautam

Patel

et al. 2018

Analyst

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A method to acquire the Raman spectra of sub-surface components using diffusely focused radiation in a microscope sampling configuration is described. This procedure generates Raman scattering at various sample depths by producing a converging beam at the back aperture of the objective lens. This method requires illumination of the sample with a defocused laser, while simultaneously increasing the number of CCD pixels that are binned along the spatial axis of the detector. We applied this diffuse sampling method to the analysis of stored red blood cells (RBCs). During storage, biochemical changes to RBCs occur (the "storage lesion"). However, there are no existing non-invasive methods to assess this. We evaluated the instrumental parameters needed to maximize the diffusely scattered signal, including pixel binning, slit width, and bandwidth. We demonstrated the effectiveness of this diffuse resonance Raman spectroscopy (DRRS) method by detecting RBCs through a blood bag segment (1 mm wall thickness). We directly compared the DRRS method to the more common stand-off Raman spectroscopy (SORS) method using both 633 nm and 785 nm excitation. Time-dependent DRRS spectra were used in a multivariate model for classification of RBCs in polymer segments by storage age. Young (6-8 day) RBCs were differentiated from old (35-40) RBCs with 100% sensitivity and 98.5% selectivity. These data indicated that DRRS is a promising, non-invasive technique for acquiring the spectra of sub-surface components, and is particularly applicable when the underlying sample can be resonantly enhanced.

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Raman spectra of extended‐chain syndiotactic poly(vinyl chloride)

Cited by 16 publications

References 5 publications

Normal-Coordinate Analysis of Poly(vinyl chloride) and Deuterated Analogs

Normal-Coordinate Analysis of Poly(vinyl chloride) and Deuterated Analogs

A Note on Fractionation of Polymers by Thin Layer Chromatography

Non-invasive analysis of stored red blood cells using diffuse resonance Raman spectroscopy

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