Abstract This paper presents a comprehensive numerical and experimental study on stress-constrained topology optimization for Fused Deposition Modeling (FDM) additive manufacturing. The qp method is employed to avoid the singularity issue of problems. P-norm function with stability transformation adopted build global stress constraint iterative corrections eliminate gap between maximum local st...

Polyolefin film products are in a state of continuous improvement in regard to their physical properties, aesthetic features, durability during processing, weatherability, and various types of special effects. Accordingly, the polymer producers of these film grade products, as well as the manufacturers of the downstream films are always interested in new developments in additive technology thes...

The degradation stability towards mechanical shearing (shear stability) of poly(methyl methacrylate) (PMMA) and its copolymer with styrene at different level of concentrations have been investigated. With a view to understanding the relationship between the thickening performance (percent increase in viscosity of the solvent in the additive of the unit weight of polymers) and shear stability of...

A facile approach is reported to process rod-coil block copolymers (BCPs) into highly ordered nanostructures in a rapid, low-energy process. By introducing a selective plasticizer into the rod-coil BCPs during annealing, both the annealing temperature and time to achieve thermodynamic equilibrium and highly ordered structures can be decreased. This process improvement is attributed to enhanced ...

Owing to freedom of design, simplicity, and ability handle complex structures, additive manufacturing (AM) or 3D printing ceramics represents a promising enabling technology has already been used produce geometrically ceramic components metamaterials. Consequently, novel applications for additively manufactured ceramics, which leverage their structural, high temperature, chemical-resistant prop...

A new alternating copolymer of fluorene and naphthalene diimide, PF-NDI, was synthesized and characterized. The highest power conversion efficiency of all-polymer solar cells based on P3HT:PF-NDI reached 1.63% with a relatively high fill factor of 0.66 by using 1,8-diiodooctane as a solvent additive to optimize the mixing morphology.

The solvothermal in situ double cycloaddition reaction of 2-cyanopyrimidine, Cu(2)O and NaN(3) with aqueous ammonia additive generated a two dimensional copper(I) coordination polymer with 5-pyrimidyl-tetrazolate, 3,5-bispyrimidyl-1,2,4-triazolate and the cyano group as the ligands. This reaction can be tuned to yield two dimensional coordination polymers solely based on tetrazolate or 1,2,4-tr...