MALDI Mass Spectrometry for the Quantitative Determination of Polymer Molecular Mass Distribution

Guttman, Charles M.; Wallace, W.E.

doi:10.1002/9780470567234.ch8

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…The relative intensity of the h-CPS2k distribution is a factor of 3 smaller at the surface of the film than in the bulk. The surface concentration of d-LPS2k was quantified using a calibration curve (in Supporting Information) constructed using ratios of the peak area of d-LPS2k ( m / z 2407.4) to the sum of peak areas for h-CPS2k ( m / z 2349.4) and d-LPS2k for several standard bulk blends mixed with solvent and measured with conventional MALDI. The d-LPS2k surface concentration of the linear/cyclic blend film was 88.3 (±1.6) wt % even before annealing.…”

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confidence: 99%

Probing Surface Concentration of Cyclic/Linear Blend Films Using Surface Layer MALDI-TOF Mass Spectrometry

Wang

Agapov

et al. 2012

ACS Macro Lett.

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Surface layer matrix-assisted laser desorption ionization time-of-flight mass spectrometry (SL-MALDI-TOF MS) is a powerful new surface sensitive technique to quantify the surface concentration of multicomponent polymer films with enrichment of one component at the surface. Its capabilities are demonstrated for the novel case of a blend of cyclic polystyrene with linear polystyrene, in which we find the composition of linear chains enriched at the surface after annealing, contrary to the expectation of a self-consistent field theory. The probing depth was confirmed to be monomolecular, which for these short chains is less than 2 nm, even though material at a much greater depth is removed by the analysis.

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confidence: 99%

Probing Surface Concentration of Cyclic/Linear Blend Films Using Surface Layer MALDI-TOF Mass Spectrometry

Wang

Agapov

et al. 2012

ACS Macro Lett.

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“…Higher polydispersity ensures better processability. One explanation for this phenomenon is that shorter chains are more easily movable in the solution and serve as “lubricants” (plasticizers) when longer chains or their aggregates are moved [ 51 ]. Table 5 shows the different types of molar masses of the copolymer samples as well as the degree of polydispersity calculated from the distribution curve.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Corn Starch Derivatives and Their Application in Yarn Sizing

Kovačević

Schwarz

Đorđević³

et al. 2020

Polymers

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The use of synthesized natural starches for the sizing process in fabric production is primarily an environmental contribution. Synthesized corn starch is environmentally friendly and productive, showing good results in cotton yarn sizing. Acrylamide (AA) and 2-hydroxyethyl methacrylate (HEMA) were applied for the grafting process of corn starch, and the initiators azobisisobutyronitrile (AIBN), potassium persulfate (KPS), and benzoyl peroxide (BP) were chosen to form the grafted monomers more effectively. The application of synthesized corn starch has been confirmed, especially with the AIBIN initiator in the grafting process of HEMA onto starch. The FTIR analysis confirmed that new and efficient products for sizing cotton yarns based on natural raw material (corn) were developed. The research showed that the synthesized corn starch improved physical-mechanical yarn properties and abrasion resistance and reduced yarn surface hairiness. Ultrasonic desizing of yarn and the use of a lower size concentration led to better results than desizing by washing, and the Tegewa numbers confirmed that the desizing process was successful.

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“…By increasing the index of polydispersity, the presence of chain contents with lower molar weight values is greater, whose mobility is also greater (for example sample HS-AA-KPS). Shorter chains are easily movable in the solution and serves as a “lubricator” (plasticizers) during movement of a longer chain or their aggregates [40]. A variation of the monomer, but also of the initiator was carried out primarily because of the more efficient grafting of the monomer onto starch, but also because of the diversities related to shorter or longer lateral chains, and their looser or tighter packing.…”

Section: Resultsmentioning

confidence: 99%

Synthetized Potato Starch—A New Eco Sizing Agent for Cotton Yarns

Kovačević

Schwarz

Đorđević³

et al. 2019

Polymers

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The objective of this research was to verify the feasibility of the use of newly synthesized biopolymer materials for sizing cotton yarns based on the basic principles of chemical modification. Research included acid hydrolysis of potato starch up to controlled molar masses together with graft-polymerization and methacrylic acid onto hydrolyzed starch to improve hydrophilicity and solubility, to increase the capability of film forming, to increase adhesive potential and to avoid retrogradation phenomena. Research objectives were primarily focused on finding an appropriate, environmentally-friendly and productive sizing agent for cotton yarns via the analysis and systematization of a large number of synthesis methods in conjunction with the characterization and properties of graft-copolymers. The research results showed that potassium persulfate initiator was most efficient in grafting of methacrylic acid onto hydrolyzed starch, while azobisisobutyronitrile (AIBIN) initiator was most efficient in grafting of acrylic acid (AC). FTIR analysis confirmed that new and efficient products for sizing cotton yarns from synthetized potato starch were obtained. Research on rheological properties of copolymers shows a higher viscosity of grafted products indicating the good stability of potential starches. Ecological improvements have been established through high desizing degree as well as improvements in physical-mechanical properties of yarn, abrasion resistance and decrease in yarn surface hairiness were noticed. The use of new derivatives of potato starch, especially of hydrolyzed starch grafted with methacrylic acid (MAA), potassium persulfate (KPS) as initiator, was confirmed. Anova statistical analysis determined the influence of the entire sizing process on individual yarn parameters.

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MALDI Mass Spectrometry for the Quantitative Determination of Polymer Molecular Mass Distribution

Cited by 5 publications

References 31 publications

Probing Surface Concentration of Cyclic/Linear Blend Films Using Surface Layer MALDI-TOF Mass Spectrometry

Probing Surface Concentration of Cyclic/Linear Blend Films Using Surface Layer MALDI-TOF Mass Spectrometry

Synthesis of Corn Starch Derivatives and Their Application in Yarn Sizing

Synthetized Potato Starch—A New Eco Sizing Agent for Cotton Yarns

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