Show:
Polymers
Misc
Additives
Rheology
Waterborne
100
Plasticizers are used in waterborne formulations to?
What is soften polymer and make workable
100
Name one synthetic and one natural rheology modifiers?
What is PVOH, ACR alkali sol emulsions, PAcrylic Acid, Nat- Celloh ethers, Psachh, Proteins
100
Name stages of emulsion polymerization and describe rates
What is initiation- fastest propagation- slow Termination - mid
200
What is the Fox Equation and what does it tell you?
What is 1/Tg=w1/Tg1 + w2/Tg2....
200
which vinyl copolymers are blocky? Random?
What is VABA VAE and VC due to r1 and r2 ratios
200
What is most important criteria in selecting a tackifier dispersion?
What is polymer/latex/ emulsion compatability
200
Rheology modifiers are mostly used to:
What is Increase the viscosity of waterborne adhesives Assist in processing
200
As particle size increases, the viscosity will? and why
What is Decrease due to more interstitial space
300
In heat activatiable PUDs, what physical change happens to make them active as an adhesive at certain temperatures?
What is soft segment melting
300
What are the 4 stages of silane deposition?
What is hydrolysis, condensation, H bonding, covalent bondine
300
what are the benefits of formulating with a Tackifier dispersion?
What is Improve adhesion (Peel and Tack) to low and high energy substrates
300
Describe 2 non-newtonian fluids
What is Dilatant pseudoplastic ^stress decr visc Dilatant- incr visc with ^ stress Thixotropic- decr visc with time Plastic
300
Name 1 static and 1 Dynamic Surface Tension Measurement Methods?
What is DuNuoy, Wilhelmy Plate, Pendant Bubble AND Max Bubble Pressure, Oscillating Jet, Drop Volume, Inclined Plane
400
The stability of Polychloroprene latexes is more stable at what pH?
What is High- 12
400
Name 4 indications that you have a problem with microbes?
What is pH & viscosity drop, odor, colr change, gas- popping lids, coag or settling, poor film formation
400
Choice of plasticizer or tackifier are determined by polymer Tg- what Tg range is used for each?
What is -10-10
400
What species are present in Propagation phase?
What is monomer droplets, polymer particles
500
Who is the father of Silicones?
What is Pleudemann
500
What is the fastest leaving group in silanes? what are disadvantages
What is NMe2 dimethyl amino toxic and fishy