Improvement in nano‐pattern replication of injection molding by polyamide/dendrimer blend

Abstract

In general, lower viscosity of materials leads to desirable nano‐pattern replication characteristics in injection molding processes. However, such materials do not meet the properties required for manufacturable products owing to their poor mechanical properties. In this study, we blended a small amount of dendrimer with high‐viscosity polyamide 6 to lower viscosity and enhance flowability of the polymer blend while maintaining desirable mechanical properties. It was observed that the flowability of the polyamide 6/dendrimer blend increased significantly with an increase in dendrimer content without affecting the mechanical properties of high‐viscosity polyamide 6. To investigate the nano‐pattern replication characteristics of the blend, injection molding process and the mold of metal stamp were used to manufacture a nano‐pattern specimen. Blending more than 0.6 wt% of dendrimer with high‐viscosity polyamide 6 significantly improved its nano‐pattern replication characteristics and flowability.

Molecular dynamics simulation study of the joining strength of different polymer‐aluminum heterointerfaces in nano‐injection molding

“…First, nylon 6 chains and polyethylene chains with a polymerization degree of 15 were constructed, and 36 PA6 chains and 120 PE chains were repeated as the polymer layers of the composite interface model (Figure 1). The density of the PA6 layer was set to 1.06/cm 3 , and PE was 0.83 g/cm 3 . Then, a face-centered cubic (FCC) structure model with dimensions of 5.4 nm  5.4 nm  4 nm was constructed with Al as the metal substrate.…”

“…In nano‐molding, the surface treatment of the metal substrate to form a relatively homogeneous nano‐cavity structure can be achieved by sandblasting, [ 3 ] laser processing, [ 4 ] chemical etching, and nano‐molding techniques, through which micro‐nanosized structures can be prepared. [ 5 ] As a result, the contact area of polymer melts on the metal surface is enriched, contributing to the formation of mechanical interlocking [ 6 ] to improve the joining strength at the interface.…”

Compatibilization and Toughening of Biodegradable Polylactic Acid/Cellulose Acetate Films by Polyamide Amine Dendrimers

“…4b that with the increase of PAMAM content, T g and T m gradually decreased to 52.83 °C and155.82 °C, respectively, T cc decreased rst and then increased, reaching the minimum value of 100.35 °C when the content was 3phr. It suggested that the addition of PAMAM could play a plasticizing role in accelerating the movement ability of molecular segments, reduce the hydrogen bond of CA, improve the molecular chain movement and crystallization capacity [33]. The crystallization enthalpy increased with the addition of PAMAM, while the melting enthalpy increased rst and then decreased, reaching the maximum at 3 phr.…”

Mechanical relaxation of functionalized carbosilane dendrimer melts

“…Dendrimers are a special class of nano-sized artificial macromolecules with a symmetrical structure, a high degree of branching, a globular architecture, an extremely low polydispersity, and a well-defined molecular weight. 1 Due to their unique structural features and excellent properties, they are widely used as nanocarriers for drug delivery, 2,3 catalysts, 4 nanosensors, [5][6][7] MRI contrast agents, [8][9][10] modifiers of rheological properties [11][12][13][14][15] and more. The development of synthesis strategies has led to the appearance of functionalized dendrimers (FD).…”