Re: Adhesion: Silane and gum

> I'm still thinking about this, and I can't see on reflection what using
> the acetone by itself would tell me. I know that I have not been
> successful at printing gum on cleaned and degreased but otherwise
> untreated glass, and I know that I was not successful at printing gum on
> silane-treated glass. It seems unlikely to me on the face of it that I
> would be successful in printing gum on acetone-treated glass, because it
> would not be any different functionally than plain untreated glass. So
> if I put acetone on glass and let it evaporate, and then tried printing
> gum on it, and failed, it wouldn't make sense to me to draw any
> inference from that about impurities in the acetone interfering with the
> ability of the silane to bond either with the glass or with the gum. The
> more reasonable inference to be drawn from that hypothetical
> observation, IMO, would be that I can't print gum on plain glass, which
> I already knew.

You may be right. I was only questioning a bit the efficiency of acetone.
http://www.solgel.com/articles/June00/Birch/cleaning4.htm might give you
some hints about glass cleaning procedures prior to coating...

Martin

----- Original Message -----
From: "Katharine Thayer" <kthayer@pacifier.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Sunday, March 06, 2005 11:36 AM
Subject: Re: Adhesion: Silane and gum

> Katharine Thayer wrote:
> >
> > MARTINM wrote:
> > >
> > > > No, I didn't use acetone on both sides of the glass, but I'm not
sure I
> > > > understand the question.
> > >
> > > Sorry, I meant, did you treat all glasses with acetone (you said: "The
wet
> > > gum coating didn't stick as well to the silane-treated glass as it
does to
> > > plain glass ..."), the "plain glass" was also treated with acetone?
> >
> > Ah, you meant did I control for any possible acetone effect. (Thanks for
> > clarification). No, when I said the silane-treated glass didn't keep
> > the gum any better than plain glass, I was speaking of all my prior
> > attempts to print on glass that's untreated except for cleaning and
> > de-greasing, and on which I have been rather consistently unable to
> > retain the crosslinked gum. But I'm still thinking that even if the
> > acetone left impurities on the glass, wouldn't that be more of an issue
> > for whether the silane bonded to the glass than for whether the gum
> > bonded to the silane? Seems so to me.
>
> I'm still thinking about this, and I can't see on reflection what using
> the acetone by itself would tell me. I know that I have not been
> successful at printing gum on cleaned and degreased but otherwise
> untreated glass, and I know that I was not successful at printing gum on
> silane-treated glass. It seems unlikely to me on the face of it that I
> would be successful in printing gum on acetone-treated glass, because it
> would not be any different functionally than plain untreated glass. So
> if I put acetone on glass and let it evaporate, and then tried printing
> gum on it, and failed, it wouldn't make sense to me to draw any
> inference from that about impurities in the acetone interfering with the
> ability of the silane to bond either with the glass or with the gum. The
> more reasonable inference to be drawn from that hypothetical
> observation, IMO, would be that I can't print gum on plain glass, which
> I already knew.
> Katharine
Received on Mon Mar 7 04:18:44 2005