The composites of rigid rod poly(phenylene terphthalamide) (PPTA) and flexible nylon 6 were prepared by using an in situ polymerization.The anion of PPTA was used as the initiator for the anionic polymerization of cap...The composites of rigid rod poly(phenylene terphthalamide) (PPTA) and flexible nylon 6 were prepared by using an in situ polymerization.The anion of PPTA was used as the initiator for the anionic polymerization of caprolactam of form the nylon 6 matrix.SEM photographs showed that PPTA was dispersed in the matrix in a form of microfibril with a diameter of 50～100nm.The microfibril serves as the reinforcing agent in nylon matrix and leads to a nearly two fold increase in modulus,64% increase in tensile strength and a significant reduction in strain to break.The DMTA results also showed that the mechanical properties of PPTA/nylon 6 composites were greatly improved.展开更多
The sulphonation of polyethersulphone(PES) with oleums gave sulphonated polyethersulphone(SPES) with high sulphonation degree and solubility in water. Results show that the acid strengths of SPES are in 8.2≤-H 0≤11....The sulphonation of polyethersulphone(PES) with oleums gave sulphonated polyethersulphone(SPES) with high sulphonation degree and solubility in water. Results show that the acid strengths of SPES are in 8.2≤-H 0≤11.9 and the catalytic activity and selectivety of SPES are proportional to the sulphonation degree of SPES. The SPES is deactivated rather slowly under experimental conditions.展开更多
文摘The composites of rigid rod poly(phenylene terphthalamide) (PPTA) and flexible nylon 6 were prepared by using an in situ polymerization.The anion of PPTA was used as the initiator for the anionic polymerization of caprolactam of form the nylon 6 matrix.SEM photographs showed that PPTA was dispersed in the matrix in a form of microfibril with a diameter of 50～100nm.The microfibril serves as the reinforcing agent in nylon matrix and leads to a nearly two fold increase in modulus,64% increase in tensile strength and a significant reduction in strain to break.The DMTA results also showed that the mechanical properties of PPTA/nylon 6 composites were greatly improved.
文摘The sulphonation of polyethersulphone(PES) with oleums gave sulphonated polyethersulphone(SPES) with high sulphonation degree and solubility in water. Results show that the acid strengths of SPES are in 8.2≤-H 0≤11.9 and the catalytic activity and selectivety of SPES are proportional to the sulphonation degree of SPES. The SPES is deactivated rather slowly under experimental conditions.
