All-polyethylene composites reinforced via extended-chain UHMWPE nanostructure formation during melt processing

Polymer ◽  
2018 ◽  
Vol 140 ◽  
pp. 107-116 ◽  
Author(s):  
Fan Zhong ◽  
Jeremia Schwabe ◽  
Daniel Hofmann ◽  
Julia Meier ◽  
Ralf Thomann ◽  
...  
Keyword(s):  
Melt Processing ◽  
Nanostructure Formation ◽  
Extended Chain ◽  
Polyethylene Composites

Digitally Tuned Multidirectional All-Polyethylene Composites via Controlled 1D Nanostructure Formation during Extrusion-Based 3D Printing

2021 ◽  
Author(s):  
Carl G. Schirmeister ◽  
Timo Hees ◽  
Oleksandr Dolynchuk ◽  
Erik H. Licht ◽  
Thomas Thurn-Albrecht ◽  
...  
Keyword(s):  
3D Printing ◽  
Nanostructure Formation ◽  
1D Nanostructure ◽  
Polyethylene Composites

Wear resistant all-PE single-component composites via 1D nanostructure formation during melt processing

Polymer ◽  
2018 ◽  
Vol 151 ◽  
pp. 47-55 ◽  
Author(s):  
Timo Hees ◽  
Fan Zhong ◽  
Christof Koplin ◽  
Raimund Jaeger ◽  
Rolf Mülhaupt
Keyword(s):  
Melt Processing ◽  
Single Component ◽  
Wear Resistant ◽  
Nanostructure Formation ◽  
1D Nanostructure

Structure-property relations of liquid crystalline polymers

1987 ◽  
Vol 45 ◽  
pp. 460-463
Author(s):  
Linda C. Sawyer
Keyword(s):  
Solid State ◽  
Liquid Crystalline ◽  
Structural Model ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Mechanical Anisotropy ◽  
Structure Property ◽  
Preparation Methods ◽  
Crystalline Polymers ◽  
Extended Chain

Recent liquid crystalline polymer (LCP) research has sought to define structure-property relationships of these complex new materials. The two major types of LCPs, thermotropic and lyotropic LCPs, both exhibit effects of process history on the microstructure frozen into the solid state. The high mechanical anisotropy of the molecules favors formation of complex structures. Microscopy has been used to develop an understanding of these microstructures and to describe them in a fundamental structural model. Preparation methods used include microtomy, etching, fracture and sonication for study by optical and electron microscopy techniques, which have been described for polymers. The model accounts for the macrostructures and microstructures observed in highly oriented fibers and films.Rod-like liquid crystalline polymers produce oriented materials because they have extended chain structures in the solid state. These polymers have found application as high modulus fibers and films with unique properties due to the formation of ordered solutions (lyotropic) or melts (thermotropic) which transform easily into highly oriented, extended chain structures in the solid state.

Wrinkling Poly(trimethylene 2,5-Furanoate) Free-standing Films: Nanostructure Formation and Physical Properties

2020 ◽  
Author(s):  
Michelina Soccio ◽  
Nadia Lotti ◽  
Andrea Munari ◽  
Esther Rebollar ◽  
Daniel E Martínez-Tong
Keyword(s):  
Irradiation Time ◽  
Polymer Surface ◽  
Laser Source ◽  
Free Standing ◽  
Force Microscopy ◽  
Nanostructure Formation ◽  
Physicochemical Changes ◽  
Angle Measurements ◽  
Atomic Force ◽  
Contact Angle Measurements

<p>Nanostructured wrinkles were developed on fully bio-based poly(trimethylene furanoate) (PTF) films by using the technique of Laser Induced Periodic Surface Structures (LIPSS). We investigated the effect of irradiation time on wrinkle formation using an UV pulsed laser source, at a fluence of 8 mJ/cm2. It was found that the pulse range between 600 and 4800 pulses allowed formation of periodic nanometric ripples. The nanostructured surface was studied using a combined macro- and nanoscale approach. We evaluated possible physicochemical changes taking place on the polymer surface after irradiation by infrared spectroscopy, contact angle measurements and atomic force microscopy. The macroscopic physicochemical properties of PTF showed almost no changes after nanostructure formation, differently from the results previously found for the terephthalic counterparts, as poly(ethyleneterephthalate), PET, and poly(trimethyleneterephthalate), PTT. The surface mechanical properties of the nanostructured PTF were found to be improved, as evidenced by nanomechanical force spectroscopy measurements. In particular, an increased Young’s modulus and higher stiffness for the nanostructured sample were measured. <br></p>

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