Side Chain Mediation of Switchable Properties of Polymers--John Zheng



Wednesday, Oct. 20
Dinner Lecture
Michael's at Shoreline, Mountain View

"Side Chain Mediation of Switchable Properties of Polymers"

Qiang (John) Zheng, Ph.D.
Landec Corporation, Menlo Park


Landec has developed "Intelimer Polymers" based on side chain crystalline polymers that yield
a pre-set sharp melting temperature or "temperature switch". Most polymers exhibit gradual
changes in physical properties (permeability, viscosity and adhesion) as temperature changes.
Intelimer Polymers yield abrupt and significant changes in physical properties around a pre-
determined transition temperature. Physical properties, such as melting temperature, molecular
weight, hydrophobicity, functionality, viscosity, and permeation can be readily tailored to meet
particular application requirements.

Landec has utilized these temperature switching polymers, Intelimer Polymers, in commercialized
food packaging, seed coating, latent catalyst, pressure sensitive adhesives and personal care
applications. The temperature switch has been used to control permeability, adhesion and viscosity,
delivering significant physical and mechanical property changes with small changes in temperature.
An overview of Landec's Intelimer technology will be presented along with a description of existing
and developmental applications:

1) Permeability control

Food packaging
O2 and CO2 permeation control through a membrane for fresh produce packaging to extend shelf-life

Seed coating
H2O permeation control through a coating on corn seeds to extend the planting window and improve yield

Latent catalyst
Controlled release/permeation of cobalt catalyst to extend the pot-life and shelf-life of unsaturated
polyester thermoset formulations

2) Viscosity control

Personal care
a) Hair care: styling and restyling through temperature switch control
b) Skin care: rheology modification control through oil thickening in creams and lotions

3) Adhesion control
ON/OFF adhesion activation: Warm-Off and Cool-Off technology-pressure sensitive adhesives
(PSA) for both industrial and medical applications

Speaker Background:

Dr. John Zheng is currently working at Landec Corporation as Director of Polymer Development
to expand the applications of Intelimer Polymer materials. He conducted his Ph.D. research in
"Side Chain Liquid Crystalline Polymers by Living Cationic Polymerization" under the supervision
of Dr. Virgil Percec in Department of Macromolecular Science at Case Western Reserve University.
He gained his B.S. in polymer science and engineering in East China University of Chemical Technology
in Shanghai, China. His prior research areas included development and commercialization of UV-
curable mid index lenses and photochromic lenses (with Rodenstock North America, Hayward) and
formulation and process development relating to lithium ion rechargeable batteries (with SRI International,
Menlo Park).



DATE: Wednesday, Oct. 20

Location: Michael's at Shoreline
(see directions below)

Timing: 6 PM social hour
7 PM dinner
8 PM lecture

Cost: $30 with advance registration
half price students, retired, unemployed
free for just the lecture at 8PM
(but please let us know for headcount)
$35 after registration deadline

PLEASE NOTE: we accept cash or checks, but are unable to
accept payment by credit card at this time.

Deadline for registration:
5 PM Monday Oct. 18

Please register on the web site

Or, contact:
April Baugher

You should receive confirmation of your registration; if not,
please contact us again.


Dinner choices (pick one when registering):
Chicken Saute Sec (with sun-dried tomatoes and mushrooms)
Vegetable Brochette with wild rice

Note that we must request that you be liable for your
registration fee if you register and do not attend;
cancellation is allowed up to the registration deadline.


Restaurant's web page directions

From 101 in Mountain View, take the Shoreline Boulevard
Exit, turning toward the bay. Drive past the Shoreline
Amphitheater on the left hand side 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 Restaurant.
Address: 2960 N Shoreline Blvd.
Restaurant phone: 650-962-1014
(do not call restaurant for reservations)


Upcoming GGPF Dinner Lectures & Other Events:

Nov. 18
"What Can Molecular Dynamics Simulations Tell Us about the Relaxation
Processes in Amorphous Polymers?"
Prof. Grant Smith
University of Utah, Dept. of Chemical Engineering

Dec. 13
"Separating DNA and Polynucleotides by Electrophoresis in Gels and
Polymer Solutions: How Does This Work?"
Karl Voss
Applied Biosystems

Jan. 14-16, 2005
A very special local offering of a three-day tutorial:
"Polymeric Science and Engineering: A Comprehensive Basic Course"
Prof. T. C. Ward and Prof. G. L. Wilkes
Virginia Polytechnic Institute

These renowned instructors will provide a rare opportunity for this class in the
Bay Area. Pricing will be very affordable, and there are of course no travel charges to
be incurred. Many GGPF members may wish to apprise colleagues about this
opportunity. Further details to be announced in coming weeks.


OTHER EVENTS of possible interest to the
GGPF audience:

The Fall schedule for UC Berkeley College of Chemistry seminars
are now posted .


Sept. 28, South San Francisco
California Separation Science Society
Evening Discussion Group:
"The Use of HPLC to Study the Stability and Degradation Products
of Drug Development Candidates"

Sept. 28-30, San Francisco
BIOPHEX annual meeting

Sept. 29, Palo Alto
"Leading Edge Nanoelectronics & Photonics Conference"


Oct. 5, Sunnyvale
IEEE Silicon Valley LEOS (Lasers & ElectoOptical Society) dinner meeting
"Photonics CMOS Compatibility using Molecularly Engineered Materials"
Ron Kubacki, speaker
NOTE: web page lists a different, incorrect topic & speaker. This month's event
is as described here. For more information, ignore web page and contact
Ram Sivaraman

Oct. 6, Burlingame
Biotech Bay Career Fair 2004

Oct. 13, Mountain View
local ASM dinner meeting
"Optically Stimulated Emission for Materials Contamination Analysis"

Wednesday, October 13, Cupertino
IEEE one-day short course
"New Developments in X-ray Microscopy And 3D Reconstruction"
Udo E. Frank, FEINFOCUS GmbH, Garbsen, Germany

October 13, Sunnyvale
IEEE/CPMT evening meeting with two presentations:
"A Novel X-ray Microtomography System with High Resolution and Throughput
For Non-Destructive Imaging of Advanced Packages",
David Scott, Xradia
"microCT Techniques In Combined 2D/3D High Resolution X-ray Systems",
Udo Frank, Feinfocus

Oct. 13-15, San Jose
AVS Northern California User Groups Annual Symposium
Chemical Mechanical Polishing / Thin Films / Plasma Etch

Oct. 15, Foster City
Bay Area Analytical Chemists Network workshop
"Pharmaceutical Analysis"

Oct. 15-19, Pacific Grove (Asilomar)
"Asilomar Conference on Mass Spectrometry Metabolite Profiling:
Biomaker Discovery, Drug Efficacy and Fundamental Biochemistry"

Oct. 16, Stanford
fifth annual Biomedical Computation at Stanford symposium

Oct. 17, Foster City
Bay Area Analytical Chemists Network workshop
"Sample preparation & automatic techniques for bioanalysis"

Oct.18-22, San Jose
local Instron training sessions
(Ed. Note: rare for these to be offered locally -- without travel expenditures)
Oct. 18 - Intro to Materials Testing
Oct. 20/21 - software ("Merlin") operators course
Oct. 22/23 - software ("series IX") course
Discount for registration before Oct. 1.

Oct. 20, Millbrae?
BioScience Forum talk by
Allen T. Christian, Biodefense Division,
Biology & Biotechnology Research Program,
Lawrence Livermore National Laboratory

Oct. 20, Stanford Hospital
Engineering in Medicine & Biology Society
"Cochlear Implants for Profound Hearing Loss - Signal Processing Considerations"
Presented by Dr.-Ing. Bernhard Seeber

Oct. 26, Palo Alto
NanoSIG all-day event: NanoElectronics & Photonics Forum Conference

Oct. 27, Foster City
BAAC Network afternoon workshop:
"Sample Preparation & Automation Techniques for Bioanalysis"
by Therevance speakers Robert Cass and Dane Karr

Oct. 27-30, Sacramento
39th Western Regional ACS meeting

Oct. 28, Sunnyvale
IEEE luncheon meeting
"The Nanotechnology Frontier: Applications of Nano to Materials and Packaging"
Dr. Anthony Laviano, Managing Director, NANOWorld


Nov. 8-12, CalTech / Pasadena
While out of the Bay Area, this is a rare west coast training session
for TA Instruments on their approach to DSC, TGA, DMA, and rheology

Nov. 10, Mountain View
ASM dinner lecture
"Nanotechnology for Batteries and Fuel Cells"

Nov. 10, Sunnyvale
IEEE/CPMT dinner talk
"Packaging Challenges in Micro-Optical Electromechanical Systems Components:
the DMD™ as a Case Study", Richard Gale, Texas Tech University

Nov. 17, Foster City
Bay Area Analytical Chemist Network workshop
"Physical methods for solid state in drug substance and drug product analysis"
by David Lechuga (Nektar), Bing Yang (Tularik) , and Slava Belenkaya (Guidant)

Nov. 19, Berkeley
One-day UC Berkely Exension course
"Introduction to Computational Biology and Bioinformatics for Technical Professionals"


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