Enhancing The Educational Experience
Through Self-Discovery and
MY RET EXPERIENCE
WHAT ARE POLYMERS?
When tiny molecules (MONOMERS) are strung in long repeated
chains, they form polymers.
WHY SHOULD WE CARE?
POLYMERS ARE EVERYWHERE!!
** Our body is made of them (DNA).
** They are in the proteins and starches we eat.
** They are in the wheels on our skateboards
and in-line skates.
** They are in the tires on our bikes
Bonding for blending the possibilities
are never ending!!!
Sometimes we want a material that has the
same properties of one polymer, and some
of the properties of another.
Instead of synthesizing a brand new
polymer we try to mix two polymers together
to form a blend with all the qualities that we
WHY ARE WE BLENDING?
► To make a hydro-gel for medical uses.
► To simulate body tissues.
► To obtain certain properties:
Durable, elastic, smooth
WHAT ARE “WE” BLENDING?
25% PNIPAam with 5% PVA
PNIPAam is Poly-N-isopropyl acrylamide
A “smart” polymer, that changes its property according to its environment.
Poly N-isopropyl acrylamide (PNIPAAm) exhibits lower critical solution temperature (LCST) and is known to undergo phase
transition when the temperature is raised from room temperature to about 32*C.
PVA is Poly Vinyl Alcohol
A water soluble polymer, non-toxic and free of danger, that can be used in the production of various things such as: paper, clothes, glues, paints,
pharmaceutical products, building materials, ceramics, etc.
1:1 25% PNIPAam : 5% PVA
2:1 25% PNIPAam : 5% PVA
1:2 25% PNIPAam : 5% PVA
O O O O O
CH(CH3)2 H H H H H
N C O O Bonding
CH2 CH2 CH2
Polymer chemistry of PVA/PNIPAAm hydrogel depicting
SO HOW DO WE DO IT?
Make 25% Polymer
IE Weigh out 3 grams PNP and add 9 ml of
Make 5% PVA solution.
IE Similar process 5 g PVA to 95 ml DI,
stir for two hours and place in oven
Ratios of PVA to PNPAam
Weigh out given amount of PNP then use
ratios to determine the amount of PVA for
3g PVA : 3g PNP for 1:1
3g PVA : 6g PNP for 1:2
6g PVA : 3g PNP for 2:1
WHAT DID WE DO WITH
• Split each ratio into two
– One half, crashed out
– Other half, air dried.
– Crushed vs crashed
– Analyzed in DSC and
SPECIAL THANK YOU!!!
Dr. Tony Lowman Dr. Michele Marcolongo Garland Fussell