Relationship of intrinsic viscosity to molecular weight for poly (1, 4-butylene adipate)

Zeng, Zuoxiang; Sun, Li; Yin, Na; Zhu, Wanyu

doi:10.1016/j.polymertesting.2009.09.006

Cited by 13 publications

(5 citation statements)

References 14 publications

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“…where [ ] is the intrinsic viscosity in dL/g, V is the viscosityaverage molecular weight, and and are viscometric constants for given solute-solvent system and temperature [33,34].…”

Section: Formation Of Nbma Prepolymers During Drumming and Its Effectmentioning

confidence: 99%

“…where is the efflux time of the solution and 0 is the efflux time of pure solvent [33]. Figure 1 shows the change of sp / with volume by volume concentration of poly(n-butyl methacrylate) (PnBMA) (2), which was measured by Ubbelohde viscometer at 25 ∘ C. It is obvious that sp / increases with drumming time, indicating the propagation of polymer chains.…”

Section: Formation Of Nbma Prepolymers During Drumming and Its Effectmentioning

confidence: 99%

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Modification of Leather Split by In Situ Polymerization of Acrylates

Zhou

Wang

et al. 2016

International Journal of Polymer Science

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Leather split, the byproduct of leather manufacture, possesses low utility value because it has loose weave of collagen fibers and weak mechanical strengths. Herein, a practical and convenient method for increasing strengths of leather split was developed by one-step in situ polymerization. The structures and properties of polyacrylate/leather split composites were systematically investigated. The results suggested the monomers with an α-methyl and a proper straight-chain ester group, such as nBMA, can effectively modify the leather split. For leather split with a thickness of 1.6 mm, the rational processes for preparation of polyacrylate/leather split composite are that monomer and split were stirred in a drum for 4 hours for full permeation and then the split was heated in anaerobic condition at 45°C for 30 min. The tensile strength, tear strength, and elongation at break of the optimized PnBMA/split composite were 18.72 MPa, 62.73 N/mm, and 46.02%, respectively. With these mechanical properties, the split after modification can be well used as leather for making shoes, bags, gloves, and clothing.

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“…where [ ] is the intrinsic viscosity in dL/g, V is the viscosityaverage molecular weight, and and are viscometric constants for given solute-solvent system and temperature [33,34].…”

Section: Formation Of Nbma Prepolymers During Drumming and Its Effectmentioning

confidence: 99%

Section: Formation Of Nbma Prepolymers During Drumming and Its Effectmentioning

confidence: 99%

Modification of Leather Split by In Situ Polymerization of Acrylates

Zhou

Wang

et al. 2016

International Journal of Polymer Science

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“…The effect of nanofillers on the molecular mass of samples was tested by viscosity method [ 30 ] and GPC method. [ 31 ] It could be seen from Table 2 that the number‐average molecular mass ( M n ), viscosity‐average molecular mass ( M v ) and weight‐average molecular mass ( M w ) of prepared pure PAA were 3.2 × 10 4 , 3.3 × 10 4 and 3.3 × 10 4 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Polyimide dielectric nanocomposites containing functional nanofillers based on multilayer structure: Design, preparation, and properties

Zhang

Lin

et al. 2022

Polymer Engineering & Sci

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Polyimide (PI) dielectric nanocomposites containing functional nanofillers based on layered structure (single-layer: BT@Al 2 O 3 @PI, double-layer: PI/B-T@Al 2 O 3 @PI, three-layer: PI/BT@Al 2 O 3 @PI/PI) were designed and prepared by using PI as matrix, barium titanate (BT)@alumina (Al 2 O 3 ) as nanofillers through in-situ polymerization compounding technology. FTIR tests indicated that PI and PI dielectric nanocomposites have been synthesized successfully.The molecular mass of BaTiO 3 @Al 2 O 3 @PAA oligomer was higher than that of pure PAA when BT and Al 2 O 3 nanofillers were incorporated simultaneously, as verified by GPC and intrinsic viscosity tests. XRD analysis showed that the addition of nanofillers destroyed the order of PI molecular structure and reduced the arrangement density of PI molecular chains. Both FESEM and HRTEM observations showed that the nanofillers were homogeneously dispersed in the PI matrix, contributing to the property improvements of PI dielectric nanocomposites. TGA results indicated that adding nanofillers improved the thermal stability and heat resistance of PI dielectric nanocomposites. The dielectric constant of PI/BT@Al 2 O 3 @PI double-layer nanocomposites was between the single-layer nanocomposites and pure PI. Due to the effective medium theory, the dielectric constant of three-layer PI/BT@Al 2 O 3 @PI/PI nanocomposites containing 5 wt% BT@Al 2 O 3 reached 5.43. This work can be expected to provide an effective strategy to fabricate PI dielectric nanocomposite films for energy storage applications. K E Y W O R D Sbarium titanate (BT), dielectric property, layered structure, polyimide (PI), thermal property | INTRODUCTIONRecently, the applications of high dielectric and high energy storage materials have attracted extensive attention. [1,2] Especially, with the rapid development of

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“…Many methods could be used to determine the molecular weight of various proteins, such as end-group analysis, H-NMR and viscometry. As a relatively simple method, viscometry is commonly applied and requiring easyto-use apparatus [25]. The potential changes of molecular weight of silk fibroins during the enzymatic processing were investigated with viscometry, and the relative viscosities of fibroin solutions were measured and shown in Figure 2.…”

Section: Effects Of Enzymatic Oxidation and Grafting Reaction On Molementioning

confidence: 99%

Enzymatic grafting of lactoferrin onto silk fibroins for antibacterial functionalization

et al. 2014

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Enzymatic oxidation of tyrosine side-chains in proteins could produce reactive o-quinones that might subsequently react with the primary amino groups of functional compounds, which provided a worthwhile reference for functionalization of fibrion materials. In the present work the potential for using tyrosinase to graft the bovine lactoferrin onto Bombyx mori silk fibroin was examined. Lactoferrin could adsorb onto silk fibers and covalently bind to the previous enzymatically oxidized fibroin surface. The enzyme-generated quinones in silk fibers also might cause self-crosslinking of fibroin peptides, which led to beneficial changes of silk properties. For the fabric treated with tyrosinase and lactoferrin slight improvements of dyeability and strength were obtained in comparison to the control. The combinedly treated fabric showed encouraging resistance to S. aureus and E. coli, the antibacterial activities reached to 87.0 % and 76.4 %, respectively. The durability of the antibacterial silk was noticeably higher than that of the sample treated with lactoferrin alone.

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Relationship of intrinsic viscosity to molecular weight for poly (1, 4-butylene adipate)

Cited by 13 publications

References 14 publications

Modification of Leather Split by In Situ Polymerization of Acrylates

Modification of Leather Split by In Situ Polymerization of Acrylates

Polyimide dielectric nanocomposites containing functional nanofillers based on multilayer structure: Design, preparation, and properties

Enzymatic grafting of lactoferrin onto silk fibroins for antibacterial functionalization

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