Synthesis and characterization of a new hybrid polyphosphazene containing two symmetrical polyhedral oligomeric silsesquioxane (POSS) units

Park, Deock-Sam; Ha, Tae-Sung; Lim, Jung‐Hyurk; Kim, Ki‐Young; Kim, Kyung Min

doi:10.1038/pj.2015.12

Cited by 4 publications

(1 citation statement)

References 22 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study we have examined the use of POSS and trifluoroethoxy cosubstituents to determine the influence of the organosilicon moieties on the properties of a well-characterized poly(fluoroalkoxyphosphazene). The unusual shape, stability, and dimensions of POSS side groups provide an opportunity to obtain more information about the properties of hybrid phosphazene–organosiloxane polymers, a class that has received only minimal attention up to this point. , In a recent related study, Park et al reported a system in which two POSS cages were assembled by corner-capping around organic substituents linked to a polyphosphazene chain. These polymers are different in concept and properties from the new species to be discussed here and require a more complex and challenging synthesis sequence.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Trifluoroethoxy Polyphosphazenes Containing Polyhedral Oligomeric Silsesquioxane (POSS) Side Groups

et al. 2016

View full text Add to dashboard Cite

We report the macromolecular substitution synthesis of a series of soluble polyphosphazenes with different molar percentages of cosubstituted trifluoroethoxy and aminopropylisobutyl polyhedral oligomeric silsesquioxane R 7 Si 8 O 12 (CH 2 ) 3 NH (R = isobutyl) (POSS-NH) cage side groups. The structure−property relationships of the novel polymers were examined using 1 H, 31 P NMR, GPC, FTIR, DSC, and TGA techniques, and properties such as contact angles, solubility, materials character, glass transitions, thermal stability, and molecular weight were measured. The average polymer chain length declined steadily from ∼3860 repeating units when only trifluoroethoxy side groups were present to 1354 repeat units when 25 mol % of the side groups were POSS, 603 units when 55 mol % were present, and only 36 units when 82 mol % of the side groups were POSS. At the same time the glass transition temperatures rose from −62 to +30.5 °C as the POSS content was increased. Unlike other bulky cosubstituents reported recently, the introduction of the amino-POSS side groups yields soft, film-forming polymers (up to ∼25% POSS) or nonflexible materials with higher loadings but does not generate elastomeric properties. These properties reflect the steric hindrance limitations imposed by the bulky POSS units. When 25 mol % of the polymer side groups are POSS units, contact angles to n-hexadecane around 67°are generated. These values are higher than all the previously reported phosphazene fluoropolymers or Teflon.

show abstract

Section: Introductionmentioning

confidence: 99%