Thermoplastics Foams Processing Fundamentals

Webinar Length: ~60 Min
Language: English
Category: Polyurethanes & Foams | Plastics & Composites
Webinar ID: KH0549
Buffet Program: Yes
Weekend Program: Yes
Brochure: No
Upcoming Schedule:
12 December 2022 (Monday), 10.00 am CST (US Time)
Available on Demand : No
Format: Live
Registration Fee:

Public Schedule (WeekDay)

Member: 100 US$
Non-Member: 167 US$
Group (5 Pax): 400 US$

Public Schedule (WeekEnd)

Member: 120 US$
Non-Member: 200 US$
Group (5 Pax): 480 US$

Custom Schedule

Member: 150 US$
Non-Member: 250 US$
Group (5 Pax): 600 US$

To Register: Registration Form

Description:

In contrast to thermosetting foaming processes which start from flowable liquid monomeric components, and end in solid thermoset cellular polymers; thermoplastic foams begin with fully formed polymers. Unlike thermoset polymers whose structures are practically locked-in with covalent cross-links, and therefore not reprocess-able, thermoplastic polymers are those which could be easily reprocessed through softening by applying heat via melting or devitrification. Thermoplastic foaming therefore requires starting with a solid polymer, softening it through melting or devitrification followed by bubble nucleation and foam expansion with both physical and chemical blowing agents that are either dissolved under high pressure or injected into the polymer during foaming process. Surface active agents are not typically required or used in thermoplastic foaming. Extrusion devices that use friction and pressure to melt and dissolve the blowing agents are often used for crystalline polymers. For amorphous polymers which are glassy above ambient temperature, heat is applied to the polymer to devitrify the polymer and then foaming expansion takes place on softening. In both cases, the end of foam expansion is achieved when the solidification is achieved either through recrystallization for crystalline polymers, or vitrification of glassy polymers. The Webinar will fully cover the fundamentals of thermoplastic foaming processes. Some of the contrasting features between thermoplastic and thermoset foaming will also be highlighted.

Expert:

Dr. Bernard E. Obi is a retired dynamic polymers/materials scientist with extensive expertise in cellular materials in general; but particularly in polyurethane foams processes and applications. He has extensive expertise in both rigid and flexible polyurethane foams. Within the flexible PU foams space, the expertise encompass high resiliency (HR), slab-stock and viscoelastic or memory foams. He earned a Ph.D. in chemical engineering and worked for The Dow Chemical Company from July 1985 to July 2015. Apart from polyurethanes technology; he also has significant expertise in free radical dispersion/suspension polymerization, surface and interfacial science, micro & macro-structure-property-performance relationships, materials development, composites, elastomers and rubbers. He authored a text book on Polymeric Foams Published December 7th 2017 by Elsevier Publishers. Dr. Obi operates his consulting company (PolyFoam Consulting LLC) out of the Houston area in Texas USA, and is engaged in providing consulting services to the polymeric foams industries and businesses.

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