Thank you for attending my presentation

Dear all participants,

I would like to convey my appreciation to all participants who have attended my presentation on 6.5.2008 and 8.5.2008. I understood that some of the print out is not clear, please drop a message here and I will upload it by this Friday (16.5.2008).

However if you drop your message after 16.5, you will need to wait under I returned to my workplace as I will be away from 17.5 until 9.6 in order to sit for my LLB examinations.

Thank you.


Regards,
Choy

Monomers

A monomer (from Greek mono "one" and meros "part") is a small molecule that may become chemically bonded to other monomers to form a polymer. A monomer is a molecule or compound, usually containing carbon, with a relatively low molecular weight and simple structure; monomers form the fundamental building blocks of polymers, synthetic resins, and elastomers. Thus, vinylidene chloride is the monomer from which polyvinylidene chloride is made, and styrene is the monomer from which polystyrene resins are produced. One of the simplest monomers, ethylene, consists of two carbon atoms (represented by C) linked by a double bond, with two hydrogen atoms (represented by H) connected to each carbon. In ethylene the carbon- hydrogen bonds are single covalent bonds, while the carbon-carbon bond is a double covalent bond.

In the presence of heat, light, and an appropriate catalyst the ethylene molecule can be excited into a reactive state in which the carbon-carbon double bond is dissociated. If two excited molecules come into contact, it is possible to link the ethylene molecules with single covalent bonds between molecules. When this process repeats itself, on the order of thousands of times, a chain is produced with a carbon backbone.

Each of these monomer molecules seems very different, but they do have some common features. Let's see if you can spot them.

Look again at the first four monomers:

What is the feature found in each of these monomers?
Actually, these monomers have two distinctive features:

i. carbon-carbon double bonds and

ii. side groups

Fundamentals of Plastics Materials & Processes

Hello, I will be conducting a training on the above title at the following date:
Date: 6.5.2008 & 8.5.2008
Time: 8.30 am until 5pm

Content:

Part 1: General concepts and topics associated with polymeric materials

• Monomers
• Polymerization
• Homopolymers
• Polymeric chains
• Amorphous chains
• Crystallinity
• Cross – linking molecular networks
• Copolymers
• Plasticizers
• Fillers, reinforcements
• Additives

Part 2: Classes of Polymeric Materials

• Thermoplastics
• Non – crystallizing (PVC, PS, ABS, PC, PPO, etc.)
• Crystallizing (PE, PP, PET, PBT, PA, etc.)
• Thermosets: Temperature, catalyst or mixing – activated (PF, UF, PU, etc.)
• Elastomers

Part 3: Processing techniques

• Uniform cross – section
• Extrusion, film blowing, calendaring, etc.
• Forming
• Thermoforming, blow molding, etc.
• Layer build – up
• Coating, rotational molding, etc.
• Cavity filling
• Compression, injection, etc.
• Composite materials and processing

Do feel free to give me some feedback related to my training. I will publish some useful materials for all of you from time to time. Please visit my blogs for latest update.