Design of a Series of Preceramic B -Tri(methylamino)borazine-Based Polymers as Fiber Precursors: Shear Rheology Investigations

Sylvain Duperrier (1) , Samuel Bernard (1) , Andreea Calin (2) , Catherine Sigala (1) , Rodica Chiriac (1) , Philippe Miele (1) , Corneliu Balan (2)

1 LMI - Laboratoire des Multimatériaux et Interfaces
2 UPB - University Politehnica of Bucharest [Romania]

Oscillatory shear flow of poly[B-(methylamino)borazine] was studied for suitability as a meltspinnable material. Shear rheology experiments show that viscosity of molten poly[B-(methylamino)borazine] is temperature dependent following an Arrhenius-type equation. The high value of the flow activation energy is caused by the presence of branched chains and cross-linked portions in the polymer network which supply an intrinsic rigidity to the molecular architecture. Dynamic rheological properties of polymers were measured at their spinning temperatures as a function of the oscillatory frequency. The frequency dependence of the storage and loss moduli as well as the damping factor shows that an appropriate ratio of viscosity to elasticity, i.e., 1 < tan δ < 2.3, is necessary to allow for extrusion while a specific range of elasticity, i.e., 104 < G′ [Pa] < 3 × 104, is required for drawing the emerging molten fibers as they solidify into fine-diameter solid filaments without loss of cohesion.

Domaines: Chimie; Matériaux; Sciences de l'ingénieur [physics]; Génie des procédés; Milieux fluides et réactifs; Matériaux

Sylvain Duperrier, Samuel Bernard, Andreea Calin, Catherine Sigala, Rodica Chiriac, et al.. Design of a Series of Preceramic B -Tri(methylamino)borazine-Based Polymers as Fiber Precursors: Shear Rheology Investigations. Macromolecules, 2007, 40 (4), pp.1028-1034. ⟨10.1021/ma062304x⟩. ⟨hal-02616108⟩