Search results for: Lih-Sheng Turng

Items from 1 to 20 out of 116 results

article

A double‐expanded polytetrafluoroethylene fabrication method for increased mechanical compliance in tubular vascular graft applications

Edward Chen, Lih‐Sheng Turng

Polymer Engineering & Science > 64 > 4 > 1756 - 1769

A novel manufacturing technique has been developed to enhance the compliance of expanded polytetrafluoroethylene (ePTFE) for vascular graft applications. This new method involves modifying the existing processing procedures by introducing an additional expansion step while using a lower temperature during the first expansion stage. The new process results in the production of highly compliant ePTFE...

article

Thermal, rheological, and mechanical characterization of compression and injection molded ultra‐high molecular weight polyethylene, high density polyethylene, and their blends

Huaguang Yang, Galip Yilmaz, Jing Jiang, Thomas Langstraat, more

Journal of Applied Polymer Science > 140 > 7 > n/a - n/a

Tensile and impact test samples of ultra‐high molecular weight polyethylene (UHMWPE), high‐density polyethylene (HDPE), and their blends at various UHMWPE/HDPE weight ratios were prepared via compression molding and injection molding for thermal, rheological, and mechanical characterization. A twin‐screw extruder with either a tapered die with air‐cooling or a regular die was used to compound and...

article

Effect of static mixer on optical properties of plastic injection molded parts

Demitri Shotwell, Jinsu Gim, Huaguang Yang, Stefanie Glas, more

Polymer Engineering & Science > 62 > 12 > 4185 - 4202

The effect of an in‐mold static mixer on the optical properties of polystyrene (PS) parts was explored within the injection molding process. Several mixers were assessed via simulation and molding trials to identify the mixing ability and effect on optical properties including retardation and birefringence. It was found that the static mixers within the runner could successfully mix the polymer and...

article

Eggshell membrane and expanded polytetrafluoroethylene piezoelectric‐enhanced triboelectric bio‐nanogenerators for energy harvesting

Shujie Yan, Zhi Zhang, Xingxing Shi, Yiyang Xu, more

International Journal of Energy Research > 45 > 7 > 11053 - 11064

With the growing demand for wearable electronic devices, triboelectric nanogenerators (TENGs) provide an effective solution by harvesting human body motions and converting them into electricity. Tribomaterial is one key element for the output performance and application of TENGs. In this study, biomaterial eggshell membrane (ESM) was investigated for use as a piezoelectric‐enhanced positive tribomaterial...

article

Viscosity characterization and flow simulation and visualization of polytetrafluoroethylene paste extrusion using a green and biofriendly lubricant

George A. Schmidt, Yu‐Jyun Lin, Yiyang Xu, Dongfang Wang, more

Polymer Engineering & Science > 61 > 4 > 1050 - 1065

Polytetrafluoroethylene (PTFE) and expanded PTFE (ePTFE) are ideal for various applications. Because PTFE does not flow, even when heated above its melting point, PTFE components are fabricated using a process called paste extrusion. This process entails blending PTFE powder particles with a lubricant to form PTFE paste, which is subsequently preformed, extruded, expanded (in the case of ePTFE), and...

article

Subcritical gas‐assisted processing of ethylene vinyl alcohol + nanoclay composites

Thomas Ellingham, Galip Yilmaz, Lukas Duddleston, Zhutong Li, more

Polymer Composites > 41 > 4 > 1584 - 1594

Ethylene vinyl alcohol (EVOH) was melt compounded with an organomodified nanoclay (NC) at a loading level of 5% by weight in a twin‐screw extruder using a subcritical gas‐assisted process (SGAP). Carbon dioxide and nitrogen were used as blowing agents to induce foaming inside of the barrel of the extruder and as the melt exits the die. Samples processed with SGAP demonstrated better dispersion of...

article

Quantification of the Young's modulus for polypropylene: Influence of initial crystallinity and service temperature

Jiquan Li, Zhou Zhu, Taidong Li, Xiang Peng, more

Journal of Applied Polymer Science > 137 > 16 > n/a - n/a

In this study, the mechanical properties of isotactic polypropylene (iPP) materials with different crystallinities at room and elevated temperatures were investigated. In order to obtain samples with a certain range of crystallinity, and to ensure a uniform microstructure of these samples, the iPP samples obtained by injection molding required melt compression molding and controlled annealing. In...

article

Non‐linear rheological response as a tool for assessing dispersion in polypropylene/polycaprolactone/clay nanocomposites and blends made with sub‐critical gas‐assisted processing

Thomas Ellingham, Galip Yilmaz, Lih‐Sheng Turng

Polymer Engineering & Science > 60 > 1 > 55 - 60

Polypropylene (PP) was blended with polycaprolactone (PCL) and nanoclay (NC) in a twin‐screw extruder (TSE) using a traditional extrusion process and a sub‐critical gas‐assisted process (SGAP). SGAP is a new and facile processing method that injects compressed gas (CO₂ or N₂) at low pressures (~10 bars) into the barrel of the extruder to induce rapid and repetitive foaming and resolubilization as...

article

Injection molding of delamination‐free ultra‐high‐molecular‐weight polyethylene

Galip Yilmaz, Huaguang Yang, Lih‐Sheng Turng

Polymer Engineering & Science > 59 > 11 > 2313 - 2322

When ultra‐high‐molecular‐weight polyethylene (UHMWPE) in powder form is injection molded, the so‐called delamination layering occurs near the skin of the parts. This layering defect hampers UHMWPE's superior wear resistance property and part surface quality. The delamination layer was caused by a combination of excessive shear stress near the part surface and high degree of molecular entanglement...

article

Fabrication and modification of wavy multicomponent vascular grafts with biomimetic mechanical properties, antithrombogenicity, and enhanced endothelial cell affinity

Hao‐Yang Mi, Xin Jing, Zhu‐Tong Li, Yu‐Jyun Lin, more

Journal of Biomedical Materials Research Part B: Applied Biomaterials > 107 > 7 > 2397 - 2408

A mismatch of mechanical properties and a high rate of thromboses are two critical challenges of creating viable artificial small‐diameter vascular grafts (SDVGs). Herein, we propose a method to fabricate wavy multicomponent vascular grafts (WMVGs) via electrospinning using an assembled rotating collector. The WMVGs consisted of a wavy silk/poly(lactic acid) (PLA) inner layer and a thermoplastic polyurethane...

article

Preparation of fast‐degrading poly(lactic acid)/soy protein concentrate biocomposite foams via supercritical CO₂ foaming

Tong Liu, Xiang‐Fang Peng, Hao‐Yang Mi, Heng Li, more

Polymer Engineering & Science > 59 > 9 > 1753 - 1762

To increase the degradation rate of poly(lactic acid) (PLA), soy protein concentrate (SPC) was introduced via melt compounding using a self‐developed, co‐rotating, non‐twin‐screw extruder. Poly(2‐ethyl‐2‐oxazoline) (PEOX) and diphenyl methane diisocyanate (MDI) were added to plasticize the melt and improve the compatibility between PLA and SPC. The PLA/SPC blends were subsequently foamed using supercritical...

article

Ultrasonication‐Induced Modification of Hydroxyapatite Nanoparticles onto a 3D Porous Poly(lactic acid) Scaffold with Improved Mechanical Properties and Biocompatibility

Junhui Si, Jixin Lin, Chen Su, Shengrui Yu, more

Macromolecular Materials and Engineering > 304 > 7 > n/a - n/a

A 3D porous poly(lactic acid) (PLA) scaffold with high porosity and well‐connected pores is fabricated using a vacuum‐assisted solvent casting technique. Its surface is modified with hydroxyapatite (HA) nanoparticles using ultrasonication to prepare an HA‐modified PLA/HA scaffold. For reference, an HA‐blended (b‐PLA‐HA) scaffold is fabricated via the solution blending method. The morphology, porosity,...

article

Effect of alkyl group on the chain extension of phosphites in polylactide

Xin Meng, Shengjie Zhu, Weiguang Gong, Lih‐Sheng Turng, more

Journal of Vinyl and Additive Technology > 25 > 2 > 144 - 148

Polylactide (PLA), which is synthesized from natural resources and can degrade easier, possesses high mechanical strength, so it is a reasonable substitute for petroleum‐based plastics. Phosphites can increase the stability of PLA through chain extension with the hydroxyl and carboxyl groups simultaneously. But there are few reports on the structural effects of phosphites on the chain extension of...

article

Injection and injection compression molding of ultra‐high‐molecular weight polyethylene powder

Galip Yilmaz, Thomas Ellingham, Lih‐Sheng Turng

Polymer Engineering & Science > 59 > s2 > E170 - E179

Ultra‐high‐molecular weight polyethylene (UHMWPE) powder was processed using injection molding (IM) with different cavity thicknesses and injection‐compression molding (ICM). The processing parameters of feeding the powders were optimized to ensure proper dosage and avoid jeopardizing the UHMWPE molecular structure. Dynamic mechanical analysis (DMA) and Fourier‐transform infrared spectroscopy tests...

article

Residual wall thickness of water‐powered projectile‐assisted injection molding pipes

Tang‐Qing Kuang, Jun‐Yu Pan, Qiang Feng, He‐Sheng Liu, more

Polymer Engineering & Science > 59 > 2 > 295 - 303

Water‐powered projectile‐assisted injection molding (W‐PAIM) is an innovative molding process for the production of hollow shaped polymer parts. The W‐PAIM utilizes high pressure water as a power to drive a solid projectile to displace the molten polymer core to form the hollow space. The residual wall thickness (RWT) and its distribution are the important quality criteria. The experimental and numerical...

article

A Visualization of Flow Patterns of Viscoelastic Fluid Partially Filled in a Co‐Rotating Nontwin Screw Extruder

Huiwen Yu, Baiping Xu, Hongwu Wu, Lih‐Sheng Turng, more

Polymer Engineering & Science > 59 > S1 > E24 - E32

A novel type of co‐rotating nontwin screw geometry is presented in this paper. The left and right screw elements have a speed ratio of 2. In order to investigate the flow pattern and mixing mechanism in the channels of such two screws, a visualization prototype with a global transparent barrel was developed. A kind of colored sodium carboxymethyl cellulose solution was prepared and used as a tracer...

article

Effect of injection speed on the mechanical properties of isotactic polypropylene micro injection molded parts based on a nanoindentation test

Lixia Wang, Yang Zhang, Lin Jiang, Xuecheng Yang, more

Journal of Applied Polymer Science > 136 > 14 > n/a - n/a

Isotactic polypropylene micro parts were molded at different injection speeds by microinjection molding. The morphology and micro structure were characterized by a polarizing microscope, and the mechanical properties of differently structured layers were characterized by nanoindentation experiments. The influence of injection speed on the nanoindentation mechanical properties of each structural layer...

article

Mechanical properties, fiber orientation, and length distribution of glass fiber‐reinforced polypropylene parts: Influence of water‐foaming technology

Ying‐Guo Zhou, Bei Su, Lih‐Sheng Turng

Polymer Composites > 39 > 12 > 4386 - 4399

It is generally believed that the length, length distribution, and orientation of fibers are important influencing factors on the mechanical properties of fiber‐reinforced polymer matrix composites. In this study, the length, length distribution, and orientation of fibers with respect to the loading direction of glass fiber‐reinforced polypropylene (GF‐PP) parts were investigated. GF‐PP of different...

article

Improving the processibility and mechanical properties of poly(lactic acid)/linear low‐density polyethylene/paraffin wax blends by subcritical gas‐assisted processing

Yann‐Jiun Chen, Emily Yu, Thomas Ellingham, Chunhui Chung, more

Polymer Engineering & Science > 58 > 12 > 2320 - 2331

Previous studies have shown that paraffin wax (PW) is capable of improving the ductility and fluidity of poly(lactic acid) (PLA) matrices. However, PLA and PW are immiscible, thus the low melting temperature of PW (at around 55°C) will pose some processing difficulties and/or practical application limitations on PLA/PW blends. Since linear low‐density polyethylene (LLDPE) and PW exhibited miscibility...

article

A Numerical Simulation of Enhanced Mixing of a Non‐Newtonian Fluid in a Cavity with Asymmetric Non‐Twin Rotors

Baiping Xu, Yao Liu, Huiwen Yu, Lih‐Sheng Turng, more

Macromolecular Theory and Simulations > 27 > 6 > n/a - n/a

Novel non‐twin rotors are developed to introduce a symmetry break to enhance the mixing in a cavity. The novel rotors co‐rotate and have different geometries with a speed ratio of 2. Numerical simulations are carried out using a finite element scheme with the mesh superposition technique. The time‐dependent flow field of a non‐Newtonian fluid obeying the Bird–Carreau constitutive model is solved....

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INFONA - science communication portal

Search results for: Lih-Sheng Turng

A double‐expanded polytetrafluoroethylene fabrication method for increased mechanical compliance in tubular vascular graft applications

Thermal, rheological, and mechanical characterization of compression and injection molded ultra‐high molecular weight polyethylene, high density polyethylene, and their blends

Effect of static mixer on optical properties of plastic injection molded parts

Eggshell membrane and expanded polytetrafluoroethylene piezoelectric‐enhanced triboelectric bio‐nanogenerators for energy harvesting

Viscosity characterization and flow simulation and visualization of polytetrafluoroethylene paste extrusion using a green and biofriendly lubricant

Subcritical gas‐assisted processing of ethylene vinyl alcohol + nanoclay composites

Quantification of the Young's modulus for polypropylene: Influence of initial crystallinity and service temperature

Non‐linear rheological response as a tool for assessing dispersion in polypropylene/polycaprolactone/clay nanocomposites and blends made with sub‐critical gas‐assisted processing

Injection molding of delamination‐free ultra‐high‐molecular‐weight polyethylene

Fabrication and modification of wavy multicomponent vascular grafts with biomimetic mechanical properties, antithrombogenicity, and enhanced endothelial cell affinity

Preparation of fast‐degrading poly(lactic acid)/soy protein concentrate biocomposite foams via supercritical CO₂ foaming

Ultrasonication‐Induced Modification of Hydroxyapatite Nanoparticles onto a 3D Porous Poly(lactic acid) Scaffold with Improved Mechanical Properties and Biocompatibility

Effect of alkyl group on the chain extension of phosphites in polylactide

Injection and injection compression molding of ultra‐high‐molecular weight polyethylene powder

Residual wall thickness of water‐powered projectile‐assisted injection molding pipes

A Visualization of Flow Patterns of Viscoelastic Fluid Partially Filled in a Co‐Rotating Nontwin Screw Extruder

Effect of injection speed on the mechanical properties of isotactic polypropylene micro injection molded parts based on a nanoindentation test

Mechanical properties, fiber orientation, and length distribution of glass fiber‐reinforced polypropylene parts: Influence of water‐foaming technology

Improving the processibility and mechanical properties of poly(lactic acid)/linear low‐density polyethylene/paraffin wax blends by subcritical gas‐assisted processing

A Numerical Simulation of Enhanced Mixing of a Non‐Newtonian Fluid in a Cavity with Asymmetric Non‐Twin Rotors

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