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Polymer Chemistry: from physical basics to microencapsulation and fiber applications

Datum: 19.06.2017 (09:00 h) - 14.07.2017 (17:00 h)
Ort: Uni Regensburg, CH 12.0.16

 

 

Announcement of a Special Seminar Series, June 19th – July 14th 2017

Polymer Chemistry:
from physical basics to microencapsulation and fiber applications

Visiting Professors will present modules open to be attended by all M.S., Ph.D. students and postdocs. Participants will obtain a certificate of participation (see below).

Prof. Dr. Margaret Frey, Cornell University, USA

Prof. Frey is a renowned scientist in the field fiber chemistry with broad ranging applications in the textile industry, tissue engineering and analytics. She will be on a 1-month sabbatical stay at the University of Regensburg.

Dr. Christian Quellet, LEUGOS S.à.r.l., Switzerland

Dr. Christian Quellet is the Director and owner of LEUGOS S.à.r.l. and is an expert in the field of polymers and development of delivery systems among which microcapsules play an important role.

Student and Postdoc participation, certificates:

Dr. Frey offers 3 independent modules. You can sign up for all three, or just one or two of them. Please come to the initial meeting time (Monday, June 19th at noon in room CH12.0.16) so that the timing of the sessions can be accommodated in the schedules of all interested students and postdocs.

Dr. Quellet’s module is part of the COSOM and Master Chemistry class “Colloid Chemistry, Part II”. It is open for further interested students. Please contact Prof. Kunz by July 1st to ensure your ability to participate in the module.

You will be able to obtain a participation certificate for each module and receive credit points (e.g. toward the ChemPharm Graduate School credit requirements).

Contents and Time Schedule of the 4 Modules

(1) Physical basics of polymers (starting June 19) (Frey)

Most synthetic polymers are formed via a very few reaction types (free-radical or condensation) connecting many small molecule ‘mers’ together. The physical chemistry and thermodynamics of the resulting polymers is significantly different than behavior of small molecules yet highly dependent on the properties the starting mers. By understanding the relationship between kinetic and equilibrium states of polymers, the same polymer can be made into materials with very different properties. Entropy becomes much less significant in mixing processes than for small molecules and equilibrium generally favors phase separation. In solutions, molecular dynamics result in rheological behavior governed by polymer chain entanglement and conformation change based on the interactions between the polymer and solvent.
Time requirement: 1.5 hours per day for 5 days (times and location will be identified on June 19th during the first meeting); Credit Points: 5

(2) Fiber chemistry (starting June 26) (Frey)

Continuing from module 1, examples in will be based on linear polymers and phase formation during fiber production via extrusion or electrospinning. Phases including amorphous (glassy and rubbery) crystalline can exist together and influence the toughness, elasticity and strength of the resulting material. Furthermore, example from pertinent literature will be examined and put into context of polymer basics and fiber applications to solve challenges in the textile industry, tissue engineering and (bio)analysis.

Time requirement: 1.5 hours for 3 days; Credit Points: 3 

(3) Practical aspects of nanofiber formation and characterization (starting July 3) (Frey)

You will be able to learn practical aspects of nanofiber electrospinning in the lab. Depending on your level of experience, you’ll spend one day making nanofibers, characterizing them and using them in microfluidic systems.
Time requirement: 0.5 or 1 day; Credit Points: 2 or 4

(4) Basics of polymer formulations and microencapsulations (starting July 10) (Quellet)

General features of polymers (constitution, chemistry of synthetic and natural polymers)
Polymers in solutions (theory of polymer solutions, solubility parameters (Hildebrand, Hansen, Flory-Huggins, phase diagrams)

Block copolymers, polymeric surfactants
Hydrocolloids and colloidal stabilization
Rheology control, transient and permanent networks
Latex, polymer dispersions
Film formation
Case studies: formulating a detergent and a waterborne adhesive.

Part 2. Microencapsulation

General features of microcapsules and their benefits (perfumes as an illustration) Microencapsulation technologies
The stability challenge (thermodynamic and kinetic aspects of partition and diffusion)

Material science of barrier materials (effect of glass transition, solubility and cross- linking)
Case study 1: interfacial polymerization
Case study 2: complex coacervation as a summary and conclusion of Part 1 and Part 2.

Time requirement: 15 hours

STARTING DAY AND TIME
For modules 1 – 3: the first meeting time will be Monday, June 19th at noon in room CH12.0.16. At this point, you’ll be determining the best time for seminar classes to accommodate everybody’s schedule.

For module 4: Please contact Prof. Kunz by July 1st to be able to participate in this module. This module is part of the lecture “Colloidal Chemistry, Part II” and takes place in the seminar room Ch.11.2.11.

OUTCOME

Students and postdocs completing this special seminar will have a strong understanding of the relationships between polymer chemical properties, behavior of polymers in melt and in solutions, and relationship of polymer properties and processing parameters to the final properties of fibers and microencapsulation systems. Students will have access to real-world applications and hands-on training.

For any questions – please contact us:

Prof. Baeumner: antje.baeumner@ur.de Prof. Kunz: werner.kunz@ur.de 

 

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