Thermal properties of polyurethane binder with 2‐(ferrocenylpropyl)dimethylsilane‐grafted hydroxyl‐terminated polybutadiene

Abstract

We synthesized a ferrocene-based burning rate catalyst, 2-(ferrocenylpropyl) dimethylsilane (FPDS). FPDS-grafted hydroxyl-terminated polybutadiene (FPDS-g-HTPB) was synthesized using hydrosilylation with a Pt catalyst. The structures of FPDS and FPDS-g-HTPB were investigated by Fourier transform infrared spectroscopy and nuclear magnetic resonance. HTPB-based polyurethanes were prepared from HTPB, ,6-hexamethylenediisocyanate (HDI), and HDI-trimer. Polyurethane network was prepared with an (NCO)/(OH) ratio of 1.05 and an [isocyanate trimer]/[total NCO] ratio of 0.3 then subjected to accelerated aging at 80 C. The thermal behaviors of the polyurethane network were compared using differential scanning calorimetry and thermal gravity analysis. The glass transition temperatures (T g ) of HTPB and FPDS-g-HTPB were À76 C and À47 C, respectively. The value of T g for the networked polyurethane was not influenced by HDI-trimer content but by FPDS content. The decomposition temperature of the neat HTPB-based polyurethane network was lower than that of the FPDS-g-HTPB-based polyurethane networks.

Progress on the synthesis and catalytic and anti‐migration properties of ferrocene‐based burning rate catalysts

“…Available polymer matrices include polymer binders used in composite solid propellants and some reactive polyesters or polyurethanes. Especially, ferrocene‐modified polymer binders such as hydroxyl‐terminated polybutadiene (HTPB) can be a kind of difunctional (binder and BR catalyst) substance, which have attracted considerable attention in recent years …”

“…Researchers have explored some other compounds similar to butacene. Meanwhile, other methods of modification of HTPB were also developed …”

Preparation of a P(THF-co-PO)-b-PB-b-P(THF-co-PO) triblock copolymer via cationic ring-opening polymerization and its use as a thermoset polymer

“…However, the weak polarity of main chain of HTPB leads to poor compatibility with other polar components, and limits its applications. 12,43 DMA analyses were performed to evaluate the dynamic mechanical properties of both elastomers. The physical properties of triblock copolymer can satisfactorily meet the processing requirements for a thermoset polymer according to the study results.…”

Synthesis, complexation of 1,2,3-(NH)-triazolylferrocene derivatives and their catalytic effect on thermal decomposition of ammonium perchlorate

“…3 Ferrocene derivatives are also known as high-burning-rate catalysts for composite propellants containing oxidizer AP and aluminum powder, 4-6 but they have some drawbacks, such as their migration to insulation composition during storage, evaporation, or sublimation loss during processing, and phase separation by crystallization. 9 Some later studies indicated that linking ferrocenes to the propellant binder via graing or introducing ferrocenes into the binder backbone during curing [10][11][12] or graing ferrocene on the hyper-branched structures 13 are effective ways to augment burning rates and to reduce the migration tendency. 9 Some later studies indicated that linking ferrocenes to the propellant binder via graing or introducing ferrocenes into the binder backbone during curing [10][11][12] or graing ferrocene on the hyper-branched structures 13 are effective ways to augment burning rates and to reduce the migration tendency.…”