New Developments in Crystallization Behavior of Strongly Interacting Chains


NOVEMBER GGPF Dinner Lecture:

Wednesday, Nov. 14
Capriccio Ristorante Italiano
Menlo Park

"New Developments in Crystallization
Behavior of Strongly Interacting Chains"

Prof. Shaw Ling Hsu
Polymer Science and Engineering Department
Materials Research Science and Engineering Center
University of Massachusetts at Amherst


Although the kinetic theory of polymer crystallization is phenomenological in origin, it successfully predicts many unique structural features such as presence of chain folding. When interchain interactions exist, refinements of this theory are required. For example, scattering experiments suggest aggregation may occur prior to true crystallization in many systems. Orientation fluctuations observed during the induction period are difficult to explain. Many polymers crystallize poorly under quiescent conditions. Upon applying a relatively small external field, however, they undergo rapid crystallization into a specific phase. In each case, the polymer structures are composed of moieties that can strongly interact through secondary forces.

Our studies have focused on a system of polymers with strongly interacting functionalities placed at exact periodicity along the polymethylene chains. Our goal is to observe the effect of strong interchain interactions in relation to nucleation and growth. For these model polymers, the sequence length of the methylene units can be precisely controlled from 12-46 units. We are thus synthetically able to tune the specificity of the interchain interactions and the conformational flexibility of the methylene chains.

Studies in our laboratory have emphasized the role of vibrational spectroscopy which is sensitive to ordering at a local level. Order formation in the strongly interacting units can be observed separately from the straightening of the methylene chains. This method permits observation of changes in the disordered phase during the induction period as well as secondary crystallization. From spectroscopic data, it was concluded that localized specific interactions strongly influence the nucleation process and divide the crystallization process into three regions. The nucleation barrier and speed of growth are greatly enhanced by specific interactions. A slower process follows which is characteristic of every chemical moiety of the polymer. Finally, in the third period, local reorganization occurs depending on local chain dynamics. Implications of this new development will be presented.



DATE: Wednesday, Nov. 14

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

Cost: $30
half price students, retired, unemployed

NOTE: Due to the smaller room for this event,
registration will close after first 40 enrolled.

Deadline for registration: 12 noon, Monday, Nov. 12.

If web-site registration is working, please register on the web:
Otherwise, register by replying to this email or by contacting
Clayton Henderson
You should receive confirmation of your registration; if not, please contact us again.


Dinner choices: Chicken with Artichoke
Grilled Halibut
Manicotti with ricotta & spinach (vegetarian)

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.

Capriccio Ristorante Italiano
325 Sharon Park Drive, Menlo Park

Just off Sand Hill Road, between Stanford and 280.
Located in shopping center at the corner of
Sharon Park Drive and Sand Hill Road.
(look for the Shell gas station.)

From 280, take Sand Hill Road toward Stanford,
and turn left on Sharon Park Drive; turn
left into the shopping center and the restaurant
will be on your right across the parking lot.

From Palo Alto/Menlo Park/El Camino Real,
take Sand Hill Road toward 280, turn right on
Sharon park Drive, left into shopping center.

Or see and type in address.
Restaurant phone 650-854-6822
(do not call restaurant for reservations)



DECEMBER GGPF Dinner Lecture

Dec. 11, Mountain View
Prof. Nitash P. Balsara
Chem. Engr. Dept., U. C. Berkeley
"Organizing Highly Immiscible Polymers"

JANUARY GGPF Dinner Lecture

Jan. 15, Mountain View
Mahesh G. Samant, IBM Almaden Research Center
"IBM's Latest Flat Panel Displays:
A Journey from Science to Technology"
Joint meeting with Society for Applied Spectroscopy


Other events of possible interest to the
GGPF audience:


Oct. 29 - Nov. 2, San Francisco
AVS 48th International Symposium, 15th
International Vacuum Congress and 11th
International Congress on Solid Surfaces
(session topics on biomaterials, applied surface analysis, dielectric materials, MEMS, nanostructures & nanotubes, etc.)
49 other short courses (of varying dates) associated
with the AVS meeting.


Nov. 4-9, Reno, Nevada
Joint Meeting of The Electrophoresis Society
and the American Institute of Chemical Engineers

Nov. 6, South San Francisco
The rescheduled Bay Area Mass Spectroscopy
Society (BAMS) Corporate Sponsorship night

Nov. 6-8, San Mateo
Training short course on Microfluids Design & Analysis
(using Coventor software)

Nov. 14-17, Sonoma
ACS POLY Division Workshop:
Organic/Inorganic Hybrid Materials - 2001

Nov. 14, location tbd
ASM dinner meeting: "Electronic Packaging"


Dec. 17, San Jose
PTI short course
Intro to Optical MEMS for BioSensing and Communications


Jan. 19-25, San Jose
Photonics West 2002
Includes sessions on
Biomedical Optics
Electronic Imaging
and over 100 engineering short courses,
including ones on
optoelectronics & MEMS packaging (SC400)
design of plastic optical systems (SC384)
photolithography for mico-otpics (SC454)
structural adhesives for optical bonding (SC015)
biochips (SC259)
microfab techniques for microfluids & bioMEMS(SC437)
and several on microscopy and spectroscopy

Jan. 20-24, Las Vegas
Annual IEEE International MEMS Conference


Feb. 11-15
AVS 3rd International Conference on Microelectronics
& Interfaces to be held

Feb. 22, Stanford
The Fifth Flory Conference
in Macromolecular and Physical Chemistry
(still in planning stages)


March 3-8
Microlithography 2002


Join the GGPF announcements list through the web page
or by replying to this announcement with your name and preferred email address.

Send any suggestions for events that should be
mentioned in these announcements to

We are sorry but this event is not yet open for registration.

You will be able to register starting