Now I really know who has too much time on their hands, Keith!! Mark
On Fri, 8 Feb 2002, Keith Passant wrote: > 136 in the explanation !! > > ----- Original Message ----- > From: "Mark Delaney" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, February 07, 2002 8:36 PM > Subject: Re: [VFB] Thanks Harmen! (Phentex) > > > > 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 > > > >
