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Sounds like competitive inhibition (google that for an analogous phenomenon with enzymes). Polymerization is a free radical chain reaction. The p-benzoquinone reacts with the radicals before they can begin the initiation step of the chain reaction. That radical is slower to react than the regular styrene radicals.

I could be completely off base (never taken any polymer classes) but I think that's what's happening.

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3 points · 3 months ago · edited 3 months ago

You are correct. Quinones soak up radicals which are needed to sustain polymerization. They are consumed in the process. Pbq, thq, hq, and mtbhq all work the same way. Peroxides create radicals and are used as initiators. They are called catalyst in industry but this is a misnomer as they are consumed.

As I understand it, the quinone typically releases an H radical from the alcohol group that is really fast reacting and terminates another radical. The quinone itself does not stay a radical.

Original Poster1 point · 3 months ago

Thanks for your replies!

This one sounds interesting. Can you tell me the source for this one?

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My companies sagely r&d director. I think if you try to figure out the mechanism and push the electrons around the molecule you will find that electrons can be considered delocalized throughout the whole molecule (Which is why the book is probably calling it a stable radical) and the only opportunity for a moiety to pop off is a H. This is specifically regarding the hydroquinone. H radical is such a small little reactive atom, it will immediately quench any other radical that comes close to bumping into.

Honestly the book rings incorrect. Radicals by their very nature aren't considered stable. If radicals exist in any appreciable amount the polymerization should be able to continue. The only way you will stop the chain reaction is with termination.

Maybe the quinone radical is stable and has a significantly lower Gibbs energy than the oligimeric radical but I would be surprised... I looked it up and PBQ Gibbs of formation is -150 kJ/mol vs. 215 kJ/mol. For styrene. So I guess this could also be a possibility. It could just make the forward reaction endergonic.

Go to office hours and see what your prof says and report back.


Ok, so I am pretty sure my motherboard is on the fritz. I had EVGA's 980 SC's in SLI. The colors started looking pixelated and off like what a bad graphics card can look like. The windows and BOIS splashes look normal however. I tried each card individually and even a old 770OC card. Each did the same thing. The HDMI from the motherboard works fine. I made sure drivers were up to date. So I am guessing something to do with the PCI slots are shot. Is there a way to confirm this?

The next question is do I just replace the motherboard, [ASUS P8Z77-V LK LGA 1155 Intel Z77] and keep my CPU [intel i5-3570K] or do I get a new motherboard and CPU? If I get a new motherboard and CPU, what is the minimum I can spend and not bottle neck the 980s?

I can get the old motherboard for around 100 but would consider spending 300 to maybe 400 for an upgraded combo.

Thank you for your help!

2 points · 7 months ago

Did you test your cards in another PC?

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Original Poster1 point · 7 months ago

Unfortunately, no. I don't have one to test them in. I can't imagine that 3/3 or the GPUs are shot vs. the MoBo.

-100 points · 1 year ago

It's murder

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46 points · 1 year ago

Wow, compelling argument.

2 points · 1 year ago

I would argue that Emerson Electric is much more of a competitor on the automation and controls front, they operate DeltaV, Provox, Fisher Controls, MicroMotion, Novaspect Consulting. In fact, I would say that they rival $ROK. Honeywell's major product in the ACS division is its distributed control system, which I believe Emerson has the major market share of. $ROK operates more on the PLC market, which many companies have been slowly turning away from for a more integrated DCS solution which lends itself more easily to 'Big Data' and 'IoT'.

18 points · 3 years ago

What single step you would like to see the EPA make to change its risk assessment process for the better, what would it be and why?

11 points · 5 years ago

Yeah, sadly if you want the good ending you can't have as much fun.

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Have as much fun playing how you want, then watch all of the endings on youtube. Problem solved.

3 points · 5 years ago · edited 5 years ago

Both fimot and imgur are blocked where i work. I use the greasemonkey addon for firefox and use a script that replaces imgur with Here is the script for greasemonkey:

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I, too, have this. If only it worked for galleries.

36 points · 5 years ago

Better yet. Doesn't block r/wtf but blocks the comment section of r/wtf. Not sure why but it annoys me because now I'll never know what's going on...

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3 points · 5 years ago

Websense sometimes makes nosense.

aside from the deregulation that he kept pushing through

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0 points · 5 years ago

Most economists would agree that many regulations cause allocative inefficiency in the economy and can be controlled by consumer demand.

3 points · 6 years ago

WHERE DID YOU GET THIS?! FF8 is one of my favorites.

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You can find them at Comicon or Blizzcon.

Original Poster3 points · 6 years ago

I think my friend got it for about hundred on ebay. It's made of stainless steel. The first one was messed up and they sent me another, so yeah, I have two gunblades.

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I got the same props at Comicon last year, 45USD for the buster and gunblade. They are not stainless, just nickel plated. They do however work reasonably well when sharpened. I split quite a few pumpkins last Halloween (I was Squall).

My College roommates thought I was colorblind for two years.

noswad4 commented on
r/picsPosted byu/[deleted]
2 points · 7 years ago


Moderator of r/science, speaking officially1 point · 7 years ago

Next time please try to find a link to the original research like so:

While it is a unfortunate bit of news, it does not belong in this subreddit. Sorry.

Original Poster107 points · 7 years ago


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94 points · 7 years ago

that is the CEO of life locks 3rd social security number. after his identity has been stolen twice. (The last I read).

6 points · 7 years ago

He has made the front page a couple of times (for LCD displays and quartz crystal timing). I had him for a special topic class. He is equally entertaining in class.

When was the last time you saw someone from Caltech or MIT? Suck it.

2 points · 7 years ago

submitted 33 seconds ago... hmmm...
If I had to guess who the peadobear's real identity was I would guess it was the OP.

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