100 words or less is a tall order, but here it goes: vinyl polymers (polyethylene, polypropylene, polyvinyl chloride) are named for the monomers they are made from, -ene denoting a double bond. During the polymerization process the double bond is opened to make the linkage between monomers. Thus in vinyl polymers there are only single carbon-carbon bonds. To actually get a polymer with some double bonds in the backbone you either have to start with a monomer containing a triple bond (also known as an allkyne or acetylene). Ring Opening Metathesis Polymerization (ROMP) actually resulted from trying experimental catalysts made for olefin polymerization (for which they worked but not as well as known catalysts, usually) on unlikely ring structures containing a double bond, making unique polymers with double bonds in the backbone. As far as I know there are no commercial products made via ROMP as yet.
I'm sure I've exceeded my hundred words. By the way, I 've got plenty to do...I'm just at home and ill today. Now I've got to write a test for my class tomorrow. Mark --- Bud Cragar <[EMAIL PROTECTED]> wrote: > Hey Mark, > > Would you take a look at this and explain it to us > in 100 words or less? :>) > > http://www.psrc.usm.edu/macrog/meta.htm > > Bud > > ----- Original Message ----- > From: Mark Delaney <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Wednesday, February 06, 2002 8:46 PM > Subject: Re: [VFB] Thanks Harmen! (Phentex) > > > > Murf, > > > > Tyvek is not poly propylene but polyethylene. > > Polyethylene floats in water, but just barely. > > > > Mark Delaney > > --- [EMAIL PROTECTED] wrote: > > > Gary; > > > While the Phentex Harmen sent me is not twisted > but > > > parallel, the strands are > > > wavy. I don't know how the strands stay > together > > > like yarn since they are > > > not twisted or intertwined but it is NOT > > > polypropelene. My "expert" opinion > > > as a longtime supplier of Tyvek (spun olefin by > > > DuPont), is that this Phentex > > > sample is the real stuff (olefin fibers). I > can't > > > tear it, it's waterproof, > > > you can't MAKE it sink in water, and it has the > same > > > feel to my fingers. > > > > > > Murf > > > > > > > Is the Phentex that you got similar to > Poly-Yarn? > > > Is it twisted like > > > > regular yarns, or are the fibers all parallel? > > > > > > > > > > > > > > > > __________________________________________________ > > Do You Yahoo!? > > Send FREE Valentine eCards with Yahoo! Greetings! > > http://greetings.yahoo.com > __________________________________________________ Do You Yahoo!? Send FREE Valentine eCards with Yahoo! Greetings! http://greetings.yahoo.com
