Read Anywhere and on Any Device!

Subscribe to Read | $0.00

Join today and start reading your favorite books for Free!

Create Free Account

Quick and Easy Sign Up!

It takes less then 1 minute to sign up, then you can enjoy Unlimited eBooks.

Sign Up Browse

Popular Genres

Read Anywhere and on Any Device!

  • Download on iOS
  • Download on Android
  • Download on iOS

Rapid, controllable and environmentally benign fabrication of thermoplastic nanofibers and applications.

Rapid, controllable and environmentally benign fabrication of thermoplastic nanofibers and applications.

Dong Wang
0/5 ( ratings)
Read Download
In situ fibrillar and lamellar hybrid morphology was found in various immiscible polymer blends prepared by melt ram extrusion of cellulose acetate butyrate /Thermoplastics at a weight ratio of 80 to 20. The formation process was analyzed and proposed. The presence of the elongational flow field determines the formation of the fibrils, and the improvement of the mixing efficiency can significantly reduce the dimensions of formed fibrils into the submicro- or nano-scale.;With above results, continuous and uniform yarns of thermoplastic nanofibers were prepared via direct melt twin-screw extrusion, providing better mixing efficiency of immiscible blends of thermoplastic polymers with cellulose acetate butyrate , and subsequent extraction removal of CAB matrix. The thermoplastics which can be made into nanofibers include polyesters, polyolefins, thermoplastic polyurethane and functional copolymers, such as PE-co-GMA (Poly), PVA-co-PE (Poly). Ratios of thermoplastics to sacrificial CAB matrix, melt viscosity, and interfacial tensions affect formation of the nanofibers. Moreover, the crystal structures of isotactic polypropylene nanofiber prepared were characterized with DSC and WAXD.;To further demonstrate the size and shape controllability of the thermoplastic nanomaterials, polyethylene materials were selected and prepared into micro- or submicrospheres or nanofibers with different diameters and shapes by varying the composition ratio and modifying the interface properties via melt blending or extrusion of cellulose acetate butyrate /LDPE melt blends and subsequent removal of the CAB. The surface structures of the LDPE micro- or submicrospheres and nanofibers were analyzed using SEM, FTIR-ATR spectroscopy, DSC and torque rheometer.;The biotechnological applications of the thermoplastic nanofibers are also exploited. Poly nanofibers with abundant active epoxy groups on surfaces were fabricated through above technique. The prepared PE-co-GMA nanofibers were aminated by reacting the epoxy groups with 1,3-diaminopropane. The resulting aminated PE-co-GMA nanofibers were subsequently biotinylated and then successfully applied to immobilize streptavidin-horseradish peroxidase conjugate via specific, strong and rapid binding of biotin and streptavidin. The high activity, efficiency, sensitivity as well as good reusability of the streptavidin-HRP immobilized PE-co-GMA nanofibers demonstrated that PE-co-GMA nanofibers could be a promising candidate as solid support materials for potential biosensor applications.
Language
English
Pages
157
Format
NOOKstudy eTextbook
Publisher
ProQuest LLC
Release
May 11, 2022
ISBN
0549666095
ISBN 13
9780549666097

Rapid, controllable and environmentally benign fabrication of thermoplastic nanofibers and applications.

Dong Wang
0/5 ( ratings)
Read Download
In situ fibrillar and lamellar hybrid morphology was found in various immiscible polymer blends prepared by melt ram extrusion of cellulose acetate butyrate /Thermoplastics at a weight ratio of 80 to 20. The formation process was analyzed and proposed. The presence of the elongational flow field determines the formation of the fibrils, and the improvement of the mixing efficiency can significantly reduce the dimensions of formed fibrils into the submicro- or nano-scale.;With above results, continuous and uniform yarns of thermoplastic nanofibers were prepared via direct melt twin-screw extrusion, providing better mixing efficiency of immiscible blends of thermoplastic polymers with cellulose acetate butyrate , and subsequent extraction removal of CAB matrix. The thermoplastics which can be made into nanofibers include polyesters, polyolefins, thermoplastic polyurethane and functional copolymers, such as PE-co-GMA (Poly), PVA-co-PE (Poly). Ratios of thermoplastics to sacrificial CAB matrix, melt viscosity, and interfacial tensions affect formation of the nanofibers. Moreover, the crystal structures of isotactic polypropylene nanofiber prepared were characterized with DSC and WAXD.;To further demonstrate the size and shape controllability of the thermoplastic nanomaterials, polyethylene materials were selected and prepared into micro- or submicrospheres or nanofibers with different diameters and shapes by varying the composition ratio and modifying the interface properties via melt blending or extrusion of cellulose acetate butyrate /LDPE melt blends and subsequent removal of the CAB. The surface structures of the LDPE micro- or submicrospheres and nanofibers were analyzed using SEM, FTIR-ATR spectroscopy, DSC and torque rheometer.;The biotechnological applications of the thermoplastic nanofibers are also exploited. Poly nanofibers with abundant active epoxy groups on surfaces were fabricated through above technique. The prepared PE-co-GMA nanofibers were aminated by reacting the epoxy groups with 1,3-diaminopropane. The resulting aminated PE-co-GMA nanofibers were subsequently biotinylated and then successfully applied to immobilize streptavidin-horseradish peroxidase conjugate via specific, strong and rapid binding of biotin and streptavidin. The high activity, efficiency, sensitivity as well as good reusability of the streptavidin-HRP immobilized PE-co-GMA nanofibers demonstrated that PE-co-GMA nanofibers could be a promising candidate as solid support materials for potential biosensor applications.
Language
English
Pages
157
Format
NOOKstudy eTextbook
Publisher
ProQuest LLC
Release
May 11, 2022
ISBN
0549666095
ISBN 13
9780549666097

More books from Dong Wang

US-China Foreign Relations: Power Transition and its Implications for Europe and Asia

4.5/5 ( ratings)

U.S.-China Relations in Strategic Domains

4.5/5 ( ratings)

Avoiding the ‘Thucydides Trap’: U.S.-China Relations in Strategic Domains (China Perspectives)

4.5/5 ( ratings)

Online Visual Tracking

4.5/5 ( ratings)

Proceedings of IncoME-V & CEPE Net-2020: Condition Monitoring, Plant Maintenance and Reliability (Mechanisms and Machine Science, 105)

4.5/5 ( ratings)

Spies in British Controlled Singapore: Policing the Japanese, 1921-1941

4.5/5 ( ratings)

Rate this book!

Write a review?

loader