Solid‐State Structure and Mechanical Properties of Blends of an Amorphous Polyamide and a Poly(amino‐ether) Resin

Abstract

Summary: Finely dispersed blends of an amorphous polyamide (AP) and a poly(amino‐ether) (PAE) resin were obtained by direct injection moulding. The blend components reacted slightly, mainly in PAE‐rich compositions, as seen by torque increases and FT‐IR. Both negative volumes of mixing and preferential orientation were observed in blends with very high AP contents, leading to synergisms in both the modulus of elasticity and the yield stress. In PAE‐rich blends, the effects of these two structural characteristics were negative, but the higher presence of reacted products also led to an overall synergistic modulus of elasticity. With the exception of blends very rich in PAE, in which the more extensive reactions led to brittle materials, the reactions compatibilized the blends due to the presence of small amounts of reacted copolymers, probably at the interface.Cryogenically fractured surface of the skin of the AP/PAE 80/20 w/w blend.imageCryogenically fractured surface of the skin of the AP/PAE 80/20 w/w blend.

Mechanical Properties of Polymer–Fullerene Bulk Heterojunction Films: Role of Nanomorphology of Composite Films

“…The predicted moduli of BHJ films from the rule of mixtures increase when increasing the volume fraction of PC 71 BM, and the measured moduli lie well between the Voigt and Reuss boundaries as shown in Figure (more details in Supporting Information, Note 1). Occasionally, synergistically greater modulus than the upper-bound modulus (Voigt model) is observed in some polymer–polymer composites due to the formation of reactive products or the increased crystallinity of components. , However, only van der Waals and electrostatic interactions exist between polymer and fullerene, without any chemical reorganization in our BHJ films . The crystallinity of PTB7 would not be increased because of the miscibility of PC 71 BM with PTB7 .…”

Origin of the High Donor–Acceptor Composition Tolerance in Device Performance and Mechanical Robustness of All-Polymer Solar Cells

“…This contrast in both the COS and toughness values between the PBDB-T:P H blend and others was also observed in the blends with D:A= 1:3. As the PBDB-T donor content increased (i.e., from 1:1 to 15:1 D:A ratios), the difference in the tensile properties among the PBDB-T:acceptor blends started to decrease, because the material properties of the PBDB-T polymer matrix began to have a greater influence on the overall mechanical properties of the blend film. , Nevertheless, the COS of the PBDB-T:P H blend was maintained over 33% for the entire D:A ratios, whereas the PBDB-T:P M and PBDB-T:P L exhibited very brittle behavior in the acceptor-rich D:A ratios. The significant improvement of D:A ratio dependent tensile properties in the PBDB-T:P H blend is mainly attributed to the use of high MW P A , which is above the critical MW at which entangled polymer networks start to form in conjunction with tie molecules bridging the different acceptor crystallites/aggregates .…”

Improving the barrier character of poly(caprolactone): Transport properties and free volume of immiscible blends

“…In order to improve the barrier character of PCL, a polymer with excellent barrier character has been selected: poly(hydroxyamino ether) (PHAE) . Besides its good barrier character, it has been found to be partially miscible with polyamide‐6, poly(butylene terephthalate), poly(ethylene terephthalate), poly(butylene adipate‐co‐terephthalate), and PCL . The previous study carried out by Granado et al .…”