An Exploratory Study of a New Class of Stepladder and Ladder Polymers - Polyimidazopyrrolones

An Exploratory Study of a New Class of Stepladder and Ladder Polymers - Polyimidazopyrrolones PDF Author: George Francis Pezdirtz
Publisher:
ISBN:
Category : Polyimidazopyrrolone
Languages : en
Pages : 28

Book Description

NASA Technical Note

NASA Technical Note PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 332

Book Description

Flight- and Ground-test Evaluation of Pyrrone Foams

Flight- and Ground-test Evaluation of Pyrrone Foams PDF Author: Allen G. McLain
Publisher:
ISBN:
Category : Ablative materials
Languages : en
Pages : 44

Book Description
Two Pyrrone materials, pure Pyrrone foam with a density of 481 kg/cu m and hollow glass microsphere-Pyrrone composite with a density of 962 kg/cu m, were tested in the Langley 20-inch hypersonic arc heated tunnel at pressure levels from 0.06 to 0.27 atm and heating rates from 1.14 to 11.4 MW/sq m. The 481-kg/cu m Pyrrone foam was also flight tested as an experiment aboard a Pacemaker test vehicle. The results of the ground tests indicated that the thermal effectiveness of the 481-kg/cu m Pyrrone foam was superior to the 962-kg/cu m glass sphere-Pyrrone composite. The 481-kg/cu m Pyrrone foam had approximately one-half the thermal effectiveness of low density phenolic nylon. The 481-kg/cu m Pyrrone foam experienced random mechanical char removal over the entire range of test conditions. Char thermal property inputs for an ablation computer program were developed from the ground test data of the 481-kg/cu m Pyrrone foam. The computer program using these developed char thermal properties, as well as the measured uncharred material properties, adequately predicted the in-depth temperature histories measured during the Pacemaker flight.

Government-wide Index to Federal Research & Development Reports

Government-wide Index to Federal Research & Development Reports PDF Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1576

Book Description

Products List Circular [opportunities for Small Businesses]

Products List Circular [opportunities for Small Businesses] PDF Author: United States. Small Business Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 422

Book Description

Monthly Catalog of United States Government Publications

Monthly Catalog of United States Government Publications PDF Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 758

Book Description

Products List Circular

Products List Circular PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 420

Book Description

NASA Scientific and Technical Reports

NASA Scientific and Technical Reports PDF Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Division
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ISBN:
Category : Aeronautics
Languages : en
Pages : 2300

Book Description

A Selected Listing of NASA Scientific and Technical Reports for 1966

A Selected Listing of NASA Scientific and Technical Reports for 1966 PDF Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 2084

Book Description

A Selected Listing of NASA Scientific and Technical Reports for ...

A Selected Listing of NASA Scientific and Technical Reports for ... PDF Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 2088

Book Description

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