Monthly Dinner Meeting
Monday, April 23, 2001


Herbert B. Scher
(Formerly with Zeneca Ag Products)


The first part of the presentation will deal with
categorizing controlled release systems for pesticides
and discussing their strengths and weaknesses.

* Polymer Systems Containing Covalently Bound Pesticides

* Degradable and Nondegradable Polymer Matrix Systems
Containing Physically Trapped Pesticides

* Polymer Coated Pesticide-Clay Granule Systems

* Polymer Membrane-Pesticide Reservoir Systems (Includes

From the commercial point of view, microcapsule systems
have proven to be the most useful and within this category
interfacial condensation polymerization processes were
considered the most suitable because they are characterized
by high pesticide loading, low processing costs, and
flexibility with respect to adjusting release rate. The
latter part of the presentation will focus on unique
interfacial polymerization microencapsulation processes
where all wall forming reactants are placed in the
dispersed oil phase. Discussion will center on methods
for physically stabilizing both the concentrated emulsions
and the resulting microcapsule dispersions, mechanism of
interfacial reactions, morphology of resulting membranes,
and methods used to vary membrane permeability. Pesticides
in microcapsule form can be used to significantly modify
performance characteristics. Examples will be provided.

Speaker Background:

Herbert Scher has over 30 years of formulation experience
in developing products for the agrochemical industry.  He
was awarded the ACS International Award for Agrochemical
Research for his accomplishments in the area of controlled
release technology. He has been the lead scientist for the
introduction of 12 commercial products, has published widely,
and has over 30 patents.  He has taught courses at local
universities in the area of Physical Chemistry, Colloid and
Surface Chemistry, Polymer Chemistry, and Pharmaceutics of
Dispersed Systems.  He is currently associated with the
Dept. of Biological and Agricultural Engineering at U. C.
Davis.  He received his Ph.D. in Physical Chemistry at the
Univ. of Minnesota and his BS in Chem. Engr. from Cornell.


PRACTICAL DETAILS for April 20 meeting:

Cost: $30 regular
$15 for unemployed/retired/students
Free for just the talk at 8 PM
(but please let us know for headcount)

Social Hour: 6:00 PM
Dinner: 7:00 PM
Talk: 8:00 PM

Dinner Choices (pick one):
Grilled Vegetable Brochette with Wild Rice
Breast of Chicken Marsala
Broiled Salmon

Location: Michael's at Shoreline, Mountain View


- Make reservations by 5 PM Thursday April 19.

- Please provide contact information (email or phone),
name & affiliation, and your DINNER CHOICE. If
attending for the talk only, please let us know so
you don't get included in the dinner headcount.

- You should receive confirmation of your registration;
if not, please try again.

- Register through the web site (preferred),

or contact:
Debashis Dutta
(408) 453-1001 ext.117

- We must ask you to be liable for the cost of
your dinner if you register and do not attend;
cancellations may be made up to the registration


From 101 in Mountain View, take the Shoreline Boulevard
Exit, turning toward the bay. Drive past the Shoreline
Amphitheater and go straight ahead, entering into
Shoreline Park. After a mile or so inside the park,
a sign for Michael's will direct you to turn left into
the parking lot for Michael's.
Address: 2960 N Shoreline Blvd.
Restaurant phone: 650-962-1014
(do not call restaurant for reservations)


Upcoming GGPF Events for your calendar:

May 17 GGPF dinner lecture
Dr. Joseph Lichtenhan, President, Hybrid Plastics,
Fountain Valley, California, will speak on:
"Nanostructured Chemical Technology:
A New Generation of Polymeric Materials."
Club House Restaurant, Palo Alto. Details t.b.a.
For background, see


Local Academic Events in the near Future:

Ed. Note: as always, there are some outstanding
polymer-related seminars at U. C. Berkeley and at Stanford:

Examples at U. C. Berkeley:

May 7 at 4 PM, Berkeley
Berkeley Lectures in Chemical Engineering
Prof. William B. Russel, Princeton
"Micellar Solutions of Associative Polymers:
from Chemical Technology to Polymer Physics"

May 9, 4PM Berkeley
Berkeley Lectures in Chemical Engineering
Prof. William B. Russel, Princeton
"Hard Sphere Colloids: The Simplest Complex Fluid"

See these and many other topics on line at

A special U.C. Berkeley event will be held in
Silicon Valley:

June 9, Santa Clara
"Berkeley In Silicon Valley: New Directions for
The Colleges of Chemistry and Engineering"
One day symposium with three tracks:
*Miniaturization of Electrical Components
Only $15. Registration & details to be announced.

Examples from Stanford:

April 5, 2001
"Chemistry in Changing Environments: A Theoretical
Projection of Polymers and Proteins,"
Prof. Rigoberto Hernandez, Dept. of Chemistry &
Biochemistry, Georgia Institute of Technology;
4:00 p.m., Carl F Braun Lecture Hall.

May 8 & 10, Stanford
Stauffer Lectures (by Prof. Frechet of UC Berkeley!)
4 PM each day

May 15 & 17, Stanford
Mason lectures (Prof. Robert Langer of MIT).
May 15 - "General Biomaterials and How They Will
Change Our Lives"
May 17 - "Novel Drug Delivery Systems"

See also the general Stanford Chemistry dept schedule

Chemical Engineering seminars can be found at


Other events of possible interest to the
GGPF audience:

April 2, Sunnyvale
29th Annual Electronic Materials Symposium

April 11,
Silicon Valley CPMT dinner meeting:
"Flip Chip Package Development at LSI Logic"
(will discuss organic flip chip packaging)

April 16 - 20, San Francisco
Materials Research Society Spring 2001 Meeting
Register by March 30 for early registration discount.
Note: meeting registration gets you a year's
membership in the MRS, and there are many
polymer-related sessions.

April 19, Pleasanton
SPE Golden Gate Section all-day Tech Fair

April 20-21, Palo Alto
International Microelectronics and Packaging Society
Advanced Technology Workshop on Thermal Management for
High-Performance Computing & Wireless Applications

April 26, SRI (Menlo Park)
NorCal AIChE one-day Symposium on the Semiconductor Industry
Note: keynote speaker will be Dr. Louis C. Glasgow -
Global Technology Director for DuPont Fluoroproducts

April 28, Stanford
One-day Nanotechnology Conference

May 17 - 18, Sunnyvale
BioMEMS 2001 Nanofabrication and Analytical Techniques
for Biomedical Microsystem Applications

May 24
Silicon Valley ACS dinner meeting
Ralph Merkle will speak on nanotechnology
details t.b.a.

June 4-7, Menlo Park
two local ThermoHaake training classes:
* Rheology Users Training Course,
June 4-5,
* Thermal Analysis Users Training Course,
June 6-7

June 9, Santa Clara
"Berkeley In Silicon Valley: New Directions for
The Colleges of Chemistry and Engineering"
One day symposium with three tracks:
*Miniaturization of Electrical Components
Only $15. Registration & details to be announced.

June 20, Millbrae
Claudia Poglitsch of Caliper Technologies, Inc.
speaks at the Northern California Pharmaceutical
Discussion Group monthly event


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