Accession Number:

ADA281419

Title:

Synthesis, Structure and Properties of Segmented Polymers Containing Mesogens

Descriptive Note:

Final rept. 22 Apr 1991-21 Apr 1994

Corporate Author:

MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING

Personal Author(s):

• Farris, Richard J.
• Hsu, Shaw L.
• MacKnight, William J.

Report Date:

1994-06-01

Pagination or Media Count:

6.0

Abstract:

The purpose of the research carried out under Contract Number DAAL03-9l-G-0127 was to determine the phase behavior and to explore the conditions for thermodynamic stability in polyurethanes containing mesogens. The work involved both segmented polyurethanes with the mesogens residing in the hard segments, and model non-segmented polyurethanes containing mesogenic groups. In addition, molecular simulation techniques were brought to bear upon the problem of the structure of the mesogen containing polyurethanes and the phase diagram of segmented polyurethanes with hard segments containing rigid diacetylene moieties. The research was a cooperative venture among three members of the Polymer Science and Engineering Department at the University of Massachusetts. R.J. Farris studied the thermodynamics of deformation and the processing of the polyurethanes to produce high degrees of orientation in both films and fibers. S.L. Hsu concentrated on molecular characterization using vibrational spectroscopy. He also was largely responsible for the molecular simulation efforts. W.J. MacKnight conducted the synthesis, characterization, mechanical and thermal properties, and morphology studies. Polyurethanes, Mesogens, Segmented polyurethanes.

Descriptors:

• *MECHANICAL PROPERTIES
• *POLYMERS
• *MOLECULAR STRUCTURE
• *URETHANES
• *PHASE DIAGRAMS
• *SEGMENTED
• THERMAL PROPERTIES
• SIMULATION
• MODELS
• SYNTHESIS
• DEFORMATION
• STRUCTURES
• LIQUID CRYSTALS
• MESOMORPHIC COMPOUNDS
• VIBRATIONAL SPECTRA
• DIAGRAMS
• ACETYLENE
• ENGINEERING
• FILMS
• MORPHOLOGY
• PROCESSING
• THERMODYNAMICS
• SPECTROSCOPY
• STABILITY
• FIBERS

Subject Categories:

• Organic Chemistry
• Polymer Chemistry
• Crystallography
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE