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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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5 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

Polymerizations of 2-(Trimethylsilyl)ethanesulfonyl-activated aziridines

A novel N-sulfonyl aziridine, N-((2-(trimethylsilyl)ethyl)sulfonyl)-2-methyl-aziridine (SES-MeAz) was synthesized, and its controlled anionic ring-opening polymerization to form poly(SES-MeAz) studied. The desulfonylation of poly(SES-MeAz)s can be achieved under mild conditions, with tetrabutylammonium fluoride (TBAF) to form polypropylene imine (PPI), although purification of the PPI was not completely successful. The block copolymer p(pTs-MeAz)-b-p(SES-MeAz), (pTs-MeAz = N-para-tosyl-2-methyl-aziridine) was prepared by a sequential polymerization. The desulfonylation of the block copolymer is the first example of the selective removal of a sulfonyl protecting group from a poly(sulfonylazirdine) block copolymer and this is the first formation of a polysufonylaziridine-block-polypropylene imine copolymer. Three-armed star-shaped poly(SES-MeAz)s were also successfully synthesized and exhibited improved solubility compared with linear poly(SES-MeAz)s.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on B13P2 by Materials Project

B13P2 crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three B13P2 sheets oriented in the (0, 0, 1) direction. there are three inequivalent B+0.23- sites. In the first B+0.23- site, B+0.23- is bonded in a cuboctahedral geometry to twelve B+0.23- atoms. There is six shorter (1.76 Å) and six longer (1.83 Å) B–B bond length. In the second B+0.23- site, B+0.23- is bonded in a 1-coordinate geometry to six B+0.23- and one P+1.50+ atom. There are a spread of B–B bond distances ranging from 1.87–1.91 Å. The B–P bond length is 2.03 Å. In the third B+0.23- site, B+0.23- is bonded in a 8-coordinate geometry to eight B+0.23- atoms. All B–B bond lengths are 1.84 Å. P+1.50+ is bonded in a distorted T-shaped geometry to three equivalent B+0.23- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BP by Materials Project

BP is Zincblende, Sphalerite structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. B3+ is bonded to four equivalent P3- atoms to form corner-sharing BP4 tetrahedra. All B–P bond lengths are 1.97 Å. P3- is bonded to four equivalent B3+ atoms to form corner-sharing PB4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on B6P by Materials Project

B6P is T-50 Boron-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent B sites. In the first B site, B is bonded in a 1-coordinate geometry to five B and one P atom. There are a spread of B–B bond distances ranging from 1.75–1.81 Å. The B–P bond length is 1.92 Å. In the second B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.74 Å) and two longer (1.88 Å) B–B bond length. P is bonded in a distorted tetrahedral geometry to three equivalent B and one P atom. The P–P bond length is 2.25 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BP by Materials Project

BP is Wurtzite structured and crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. B3+ is bonded to four equivalent P3- atoms to form corner-sharing BP4 tetrahedra. There is three shorter (1.96 Å) and one longer (1.98 Å) B–P bond length. P3- is bonded to four equivalent B3+ atoms to form corner-sharing PB4 tetrahedra.

36 MATERIALS SCIENCE↗