Kind: captions
Language: en
from the top of this 45 meter drop tower
my friends from the how ridiculous
YouTube channel are about to release a
watermelon here we
are in freef fall for a full 3 seconds
the watermelon accelerates to over 100
kmph before smashing into the
ground the results are predictable but
this was just a control for the actual
experiment another watermelon was
sprayed with a polymer coating we'll
come back to what this is and how it
works but for now let's see how the
coated watermelon fares in the drop
test that's
insane you're kidding me instead of
shattering the watermelon bounces
and remains intact for the most part
anyway is it broken
inside look yeah it is it's definitely
slushy even with an axe the how
ridiculous boys can't crack this shell
how is it
not oh
yes can pull through
that oh look at it's
actually watermel it's intact it's still
a watermel look at
that oh that's nice that is amazing it
is pretty amazing that the watermelon
could survive an impact at over 100 km
hour so I went to find out more about
the coding called Linx it's a mess the
individual components are a mess when it
goes on it goes on is a big mess you saw
me wear a sprayit it's a mess but when
you're done you're really cool stuff
Linx is made from two ingredients A and
B inside of each of these is multiple
things but the main component of a is
dienol methane 44 diisocyanate or MDI
for short it's very reactive due to
these groups on the end B is the poly so
the simplest way I could explain is it's
a plasticizer the main component of b is
Alpha 2 aminomethyl ethyl Omega 2 Amino
methyl ethoxy polyoxy methyl one2
ethanal long name for a long chain
molecule in reality it would be many
times longer than this now I managed to
convince Brinn to let me mix the two
ingredients the oldfashioned way with
the stir stick what the a wow I'm going
to dump a and b in here and just mix
them we see what happens all right okay
ready yep all
right go for it
how quickly should they react they're
reacting right now who did you see
that that is crazy and you can see
there's almost like I don't know smoke
or something coming well it's probably
getting quite warm I guess I could have
got the thermometer out for you whoa can
we feel the bottom tell me you tell
me yeah that's very hot it's like the
bottom of a hot rip oh very hot yeah
what's Happening Here is the molecules
of A and B are re acting to form long
chains where they join they form a Ura
group so the substance is called a
polyura the structure of these chains is
responsible for the properties of the
coating so it's hard because it's made
of a tangled mess of molecular threads
but flexible because these threads can
be stretched out and then snap back into
place things you learn doing the
reaction this way are that it's rapid
only taking seconds to react and it's
exothermic a lot of heat is given off as
these bonds form but this this ball of
Linex isn't really useful for much so
how do you mix a and b to form an
effective coating put on really high
pressure force them together in a really
small space high temperature high
pressure just Ram them into each other
that essentially mixes them and then
they come out the end of the gun so from
the time they're separate
components they mix out the gun hit your
target fraction of a second this is
where the magic happens
inside here so pull the trigger out
comes
Linx we decided to line ax a piece of
paper to see how strong the coating
is as you can see it came out as a hot
High Press liquid okay now how hot is
that it's it's quite warm it's quite
warm and because that's an exothermic
reaction it comes out at 150 but keeps
getting hotter and hotter uh you can
probably rip it right now I can rip it
yeah I think so there you go okay all
right those two chemicals just keep kind
of looking for each other or looking for
something so to speak until until every
last molecule's found a home or given up
looking and that could take a day or
more but there's plenty of opportunities
to cross link right now so that's what
it's doing and that's where all the
Heat's coming from so it's already dry
I'm not going to get any on me it's
already uh cooling back down so we've
done the vast majority of curing and
cross linking okay yeah we're getting
we're getting there right we're getting
there it was harder it was harder so now
we'll wait till some of this heat goes
away we're probably getting a good
amount of curing going on it is really
tough to rip at this point it's strong
stuff that tensile strength will get
you that high tensile strength is the
same reason the Linx coated watermelon
bounces that's
insane as it hits the ground the
contents of the watermelon are squeezed
out sideways but the tangle of polyurea
molecules pull together preventing the
Rind of the watermelon from deforming
too much and breaking apart so the
watermelon bounces instead of
Smashing this type of coating is now
used in the walls of the Pentagon
preventing exterior explosions from from
launching shrapnel into the building the
main cause of injury from explosions and
it's used in bulletproof vests to
contain bullet fragments that could
cause serious injury all of this is
pretty incredible for a substance
invented as a truck bedliner yeah come
on down bring your entire vehicle
anything but your cat little line
exit massive thanks to the guys over at
the how ridiculous YouTube channel you
know they're the ones that launch that
basketball off the dam that is my most
popular video and they have been doing
some incredible experiments like bowling
ball versus axe so go subscribe to their
Channel go do it right now