Characterization of polystyrene and polyisoprene by normal-phase temperature gradient interaction chromatography

Lee, Wonmok; Cho, Dong−Hyun; Chun, Byung Ok; Chang, Taihyun; Ree, Moonhor

doi:10.1016/s0021-9673(00)01163-8

Cited by 76 publications

(50 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, since the polymers 5 used in tyre treads may have a molecular weight of greater than 200,000, even detection of such functional groups becomes a near impossibility. In a single previous report 16 NP-TGIC was shown to be sensitive to the presence of polar end-groups on the polymers and the separation of polymers, not only in terms of molecular weight, but also in terms of functional groups was reported. In this report Chang et al used NP-TGIC for the analysis of hydroxyl chain-end functionalised polystyrene polymers (figure 1).…”

Section: Introductionmentioning

confidence: 98%

Normal-phase (temperature gradient) interaction chromatography – A powerful tool for the characterisation of high molecular weight chain-end functionalised polymers

Agostini

Oti

Keth

2015

European Polymer Journal

View full text Add to dashboard Cite

(2015) 'Normal-phase (temperature gradient) interaction chromatography A powerful tool for the characterisation of high molecular weight chain-end functionalised polymers.', European polymer journal., 73 . pp. 105-115. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. is all the more remarkable that complete (baseline) resolution can be achieved for two polymers with an identical molar mass (< 200,000 gmol -1 ), which differ only in that one sample is functionalised with a single primary alcohol group.

show abstract

Section: Introductionmentioning

confidence: 98%

Normal-phase (temperature gradient) interaction chromatography – A powerful tool for the characterisation of high molecular weight chain-end functionalised polymers

Agostini

Oti

Keth

2015

European Polymer Journal

View full text Add to dashboard Cite

show abstract

“…Therefore, over the past few years, the use of temperature as a variable controlling selectivity and separation speed has become more popular [1,2]. However, most of the studies on temperature effects have focused on the two classical chromatographic modes-reversed-phase liquid chromatography (RPLC) and normal phase liquid chromatography (NPLC) [3][4][5][6][7][8][9][10][11]. Work on the role of temperature on bare silica using reversed-phase solvents is beginning to appear.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on the chromatographic behavior of epirubicin and its analogues on high purity silica using reversed-phase solvents

DONG¹,

HUANGL²

2007

Chromatographia

View full text Add to dashboard Cite

The influence of temperature on the retention behavior of epirubicin and its analogues on high purity silica with reversed-phase solvents has been systematically investigated. It was found that temperature effects on retention are highly dependent on the type and concentration of organic modifier, as well as the pH of the mobile phase. In organic-rich mobile phases, the type of organic modifier plays an important role. With an aprotic solvent as modifier, retention times show anomalous increases with elevated temperature. At the same time, both efficiency and resolution are significantly improved but this is not the situation with a protic solvent as modifier. In addition, temperature shows different effects on retention time and selectivity when the pH is changed, and temperature-dependent selectivity reversal is found at higher pHs. In aqueousrich mobile phases, regardless of the nature of the organic solvent and pH, retention of solutes drops as temperature is raised. It seems that the effect of temperature on chromatographic behavior of the solutes on bare silica using mobile phases containing various organic modifiers or pHs, results from a number of different retention mechanisms.

show abstract

“…15,16 For example, it has been shown that the chemical composition differences of HPLC-fractionated polystyrene-b-polyisoprenes (PS-b-PIs) are as high as 9 wt %. 17 HPLC has been successfully applied to fractionate different BCPs such as polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA), 18 PS-b-PI, 17,19 and polystyreneb-poly-2-vinylpyridine. 20 In addition to separating BCPs in terms of the chemical composition difference, HPLC fractionation provides a unique opportunity to prepare BCP samples that have narrower chemical composition distributions than the mother BCP samples.…”

Section: Introductionmentioning

confidence: 99%

Chemical composition effects on the fracture of polystyrene‐block‐poly(methyl methacrylate)block copolymers

Kim

Han

Ryu

et al. 2006

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

The crazing and fracture behaviors of glassy-glassy block copolymers were investigated for polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymers that had similar overall molecular weights but different poly (methyl methacrylate) (PMMA) molar fractions. A liquid chromatography technique was applied to separate as-synthesized PS-b-PMMA [(1) weight-average molecular weight (M w ) ¼ 94,000 g/mol and PMMA molar fraction ¼ 0.35 and (2) M w ¼ 65,000 g/ mol and PMMA molar fraction ¼ 0.28] into three fractions with different chemical compositions. With a copper-grid technique, the fracture behaviors of 0.5-lm-thick PS-b-PMMA films were studied as a function of the applied strain. For the higher M w PS-b-PMMA samples, the median strains at crazing and fibril breakdown increased with an increase in the PMMA molar fraction from 0.24 to 0.46, corresponding to an increase in the chain entanglements in the PMMA domains. In contrast, for the lower M w samples, the two values were not significantly changed even when the PMMA molar fraction was varied from 0.16 to 0.35. M w of the minor component in PS-b-PMMA played a critical role in controlling the fracture behaviors of the block copolymers. Specifically, M w /M e of the minor component (where M e is the molecular weight between entanglements) had to be roughly larger than 2 for the block copolymers to sustain sufficient strains before fracture.

show abstract

Characterization of polystyrene and polyisoprene by normal-phase temperature gradient interaction chromatography

Cited by 76 publications

References 37 publications

Normal-phase (temperature gradient) interaction chromatography – A powerful tool for the characterisation of high molecular weight chain-end functionalised polymers

Normal-phase (temperature gradient) interaction chromatography – A powerful tool for the characterisation of high molecular weight chain-end functionalised polymers

Effect of temperature on the chromatographic behavior of epirubicin and its analogues on high purity silica using reversed-phase solvents

Chemical composition effects on the fracture of polystyrene‐block‐poly(methyl methacrylate)block copolymers

Contact Info

Product

Resources

About