Abstract
We synthesized a series of copolybenzamides (PBA) through chain-growth condensation polymerization (CGCP) of 4-(octylamino)benzoate (M4OB) and methyl 3-(4-(octyloxy)benzylamino) benzoate (M3OOB) co-monomers. Well-defined copolybenzamides with close to theoretical molecular weights (Mn ≈ 10,000–13,000) and narrow molecular weight distributions (Mw/Mn < 1.40) were obtained. Selective removals of the protecting group (i.e., 4-(octyloxy)benzyl group) from the affording P(M3OOB-co-M4OB) copolybenzamides were subsequently performed to obtain P(M3NH-co-M4OB) copolymers. These novel N-H-containing copolybenzamides (named as PNHBA) can not only provide hydrogen bonds for polymer-polymer blends but also have good solubility in organic solvents. Miscibility of the PNHBA and Nylon 6 blends was investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), FT-IR, contact angle analysis, transmission electron microscope (TEM), and dynamic mechanical analysis (DMA). This study illustrates a novel type of copolybenzamide with controlled molecular weight and narrow molecular weight distribution through an effective synthetic strategy, and can be applied to a practical blend of Nylon 6 with good miscibility.
Highlights
The development of high-performance polymers has been an important and long-term target of the past few decades
The polymer miscibility can be enhanced through specific interactions, such as van der Waals forces, dipole-dipole interactions, hydrogen bonding, and electrostatic forces
This we study, we synthesized series of copolybenzamides through
Summary
The development of high-performance polymers has been an important and long-term target of the past few decades. The study of polymer blends continues to draw attention from both a practical point of view and in fundamental research for the more precise understanding of the factors dominating polymer miscibility [1]. The simple and effective polymer blending technique has generated new materials with combinations of the tailored properties that cannot be obtained in individual polymers. It is, important to study the miscibility and phase behavior of polymer blends. The polymer miscibility can be enhanced through specific interactions, such as van der Waals forces, dipole-dipole interactions, hydrogen bonding, and electrostatic forces
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