Accession Number : ADA187418

Title :   Characterization and Selection of Polymer Materials for Binary Munitions Storage. Part 3. Branch Content Determination.

Descriptive Note : Final rept.,

Corporate Author : ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s) : Desper, C R

PDF Url : ADA187418

Report Date : Sep 1987

Pagination or Media Count : 24

Abstract : Previous studies of potential failure mechanisms in polyolefin containers for binary munitions have established that good environmental stress cracking resistance (ESCR) is an essential property of a successful candidate resin. In this regard, it was also found that the linear low density polyethylenes (LLDPE's) offered performance advantages, and that the key resin characteristic influencing ESCR is the extent of short chain branching. A characterization method which involves using precision lattice parameter determination for correlation with the branch content has been implemented. The data acquisition method obtains the required wide angle X ray scattering (WAXS) data at greatly enhanced speed, without sacrificing any accuracy. The data acquisition system combines a position-sensitive X ray detector with a 65 kilobyte microcomputer capable of operating as multichannel analyzer and of performing immediate data analysis. The method is applied to the determination of branch content in a series of polyethylene resins for binary munitions storage. In addition, the resins are characterized and compared in terms of crystallinity and molecular weight distribution. Keywords: Polyethylene, Crystallization, Molecular weight, Copolymers, Stress corrosion, Cracking(fracturing).

Descriptors :   *POLYETHYLENE, *BINARY CHEMICAL AGENTS, *AMMUNITION CONTAINERS, *X RAY DIFFRACTION, ORDNANCE, STORAGE, COPOLYMERS, DATA PROCESSING, POLYMERS, MICROCOMPUTERS, BINARY COMPOUNDS, CRYSTALLIZATION, CRACKING(FRACTURING), RESISTANCE, MOLECULAR WEIGHT, INFRARED SPECTROSCOPY, GEL PERMEATION CHROMATOGRAPHY, LOGISTICS, COMPATIBILITY, CHEMICAL ORDNANCE, MOLECULAR WEIGHT, X RAYS, STRESS CORROSION, CONTAINERS, OLEFIN POLYMERS, FAILURE, CRYSTALS, STRESSES, LOW DENSITY, DETECTORS, POSITION(LOCATION), SENSITIVITY, MATERIALS, SELECTION

Subject Categories : Plastics
      Military Operations, Strategy and Tactics

Distribution Statement : APPROVED FOR PUBLIC RELEASE