Toughening Modification of Poly(butylene terephthalate)/Polycarbonate Blends by Poly(ethylene-co-octene)

2005 ◽  
Vol 13 (4) ◽  
pp. 385-394
Author(s):  
Huiyu Bai ◽  
Yong Zhang ◽  
Yinxi Zhang ◽  
Xiangfu Zhang ◽  
Wen Zhou
Keyword(s):  
Average Diameter ◽  
Melt Blending ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Bisphenol A Polycarbonate ◽  
Elongation At Break ◽  
Butylene Terephthalate ◽  
Twin Screw ◽  
Poly Ethylene ◽  
The Impact

New toughened poly(butylene terephthalate) (PBT)/bisphenol A polycarbonate (PC) blends were obtained by melt blending with commercial poly(ethylene-co-octene) copolymer (POE), varying the POE content up to 10 wt%, in a twin screw extruder, followed by injection moulding. The influence of POE on the properties of the PBT/PC blends was investigated in terms of mechanical testing, dynamic mechanical thermal (DMTA) analysis, differential scanning calorimetry (DSC), and scanning electronic microscopy (SEM). The results showed that addition of POE led to remarkable increases in the impact strength, elongation at break and Vicat temperature, and a reduction in the tensile strength and flexural properties of PBT/PC blends. The morphology of the blends was observed using SEM and the average diameter of the dispersed phase was determined by image analysis. The critical inter-particle distance for PBT/PC was determined.

Tuning of HDPE Properties for 3D Printing

2018 ◽  
Vol 773 ◽  
pp. 67-71 ◽  
Author(s):  
Paweesinee Chatkunakasem ◽  
Panisa Luangjuntawong ◽  
Aphiwat Pongwisuthiruchte ◽  
Chuanchom Aumnate ◽  
Pranut Potiyaraj
Keyword(s):  
3D Printing ◽  
Melt Flow Index ◽  
Flow Index ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Crystalline Polymers ◽  
Twin Screw ◽  
Low Crystalline

The objective of this study is to improve high density polyethylene (HDPE) properties for 3D printing by addition of graphene and low density polyethylene (LDPE). Graphene was prepared by modified Hummer’s method. The prepared graphene was characterized by the infrared spectroscopy and the X-ray diffraction analysis (XRD). Graphene/HDPE and LDPE/HDPE composites were successfully prepared through the melt-blending technique using a twin-screw extruder. The melt flow index (MFI) and differential scanning calorimetry (DSC) were employed to characterize neat HDPE and the modified HDPE. FTIR and XRD results show that graphite was successfully changed into graphene completely and MFI of graphene/HDPE and LDPE/HDPE decreased as the amount of graphene and LDPE in the composite blends increased. DSC results show that the addition of low crystalline polymers can reduce a crystallization temperature and crystallinity content.

Preparation and Properties of PA66/PP/MOS Whisker Composites

2011 ◽  
Vol 311-313 ◽  
pp. 20-25
Author(s):  
Jian Peng ◽  
You Ming Cao
Keyword(s):  
Flame Retardant ◽  
Coupling Agents ◽  
Melt Blending ◽  
Screw Extruder ◽  
Standard Samples ◽  
Scanning Calorimetry ◽  
Flame Retardant Property ◽  
Twin Screw ◽  
Magnesium Oxysulfate ◽  
Flame Retardant Properties

The composites composed of polyamide66（PA66）, polypropylene（PP）, and magnesium oxysulfate whisker(MOS) were prepared by means of melt blending through co-rotation twin screw extruder. The standard samples were prepared by injection machine. The effect of coupling agents on the whisker surface, and the influence of MOS content on mechanical properties, heat properties, flame-retardant properties and the microstructure of the composites were investigated by scanning electron microscopy(SEM), thermogravimetry(TG) and differential scanning calorimetry(DSC) techniques, respectively. The results showed that the MOS whisker modified with coupling agents KH570 possesses better activation exponential and dispersity, and the tensile strength, flexural strength and toughness of PA66/PP/MOS composite were firstly increased and then decreased with the MOS content increasing, the optimum adding amount of MOS was 25phr. The flame retardant property was improved remarkable by adding of MOS.

Crystallization Behavior and Mechanical Properties of PP/EVA Blends

2014 ◽  
Vol 1033-1034 ◽  
pp. 869-872
Author(s):  
Kun Yan Wang
Keyword(s):  
Mechanical Properties ◽  
Crystallization Behavior ◽  
Ethylene Vinyl Acetate ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Blending Method ◽  
Twin Screw

Polypropylene (PP)/ethylene-vinyl acetate (EVA) blends were prepared using a twin-screw extruder by melt blending method. The influences of the EVA contents in PP/EVA blends on crystallization behavior and mechanical properties were investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). XRD results show that the EVA not change the crystal structure in the blends but only decrease the intensity of the diffraction peak. DSC results showed that the melting point and crystallization point decreased when EVA added to the blend. The tensile properties of PP/EVA blend become much better.

Preparation and Characterization of Poly(Lactic Acid) (PLA)/Polyoxymethylene (POM) Blends

2018 ◽  
Vol 917 ◽  
pp. 3-6 ◽  
Author(s):  
Muhammad Haniff ◽  
Mohd Bijarimi ◽  
M.S. Zaidi ◽  
Ahmad Sahrim
Keyword(s):  
Tensile Strength ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Chemical Analysis ◽  
Poly Lactic Acid ◽  
Melt Blending ◽  
Screw Extruder ◽  
Elongation At Break ◽  
Twin Screw

PLA has limited applications due to its inherent brittleness, toughness and low elongation at break. One of the options for improvement is through blending with polyoxymethylene (POM). Melt blending of polylactic acid (PLA) and polyoxymethylene (POM) at 90/10 PLA/POM composition was carried out in a twin-screw extruder. The PLA/POM was loaded with 1 – 5 wt.% of nanoclay (Cloisite C20). The blends were then characterized for mechanical, morphological, chemical and thermal properties. It was found that tensile strength, Young's modulus, and elongation at break improved when the loadings of nanoclay were increased. Chemical analysis by FTIR revealed that PLA/POM blend is immiscible.

scholarly journals PP-CBW/m-LLDPE/micro-CaCO3 composite films manufactured from bumper waste by blown film extrusion

2019 ◽  
Vol 281 ◽  
pp. 03001 ◽  
Author(s):  
Nancy Zgheib ◽  
Sylvain Seif ◽  
Nemr El Hajj
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Single Screw Extruder ◽  
Blown Film ◽  
Twin Screw ◽  
Mulch Films ◽  
Blown Film Extrusion ◽  
The Impact

The synthesis of polypropylene-based car bumper waste (PP-CBW)/metallocene linear low-density polyethylene (m-LLDPE)/micro-CaCO3 composite films for agriculture mulch films applications has been thoroughly investigated during this study. The chemical composition of these wastes was determined by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Three blends of various compositions were prepared using a twin-screw extruder, the pellets were then blown into films using a single screw extruder. The mechanical properties of the films were then studied and compared with the EN 13655, 2002 standards for agriculture mulch films applications. The results indicated that the use of an anhydride grafted polypropylene (MAH-g-PP) as compatibilizer improves the adherence at the interface between the polar acrylic paints present in the car bumper waste and the polymer matrix. Also, the presence of stearic acid surface treated micro-CaCO3 improves considerably the mechanical properties of the composite when the amount of PP-CBW is less than 13 wt%. Using higher amount of PP-CBW improves the tear resistance properties in TD and MD but fails to increase the impact strength and the tensile properties in MD and TD.

scholarly journals Preparation and Performance of Ultra-Fine Polypropylene Antibacterial Fibers via Melt Electrospinning

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 606 ◽  
Author(s):  
Qiu-Sheng Li ◽  
Hong-Wei He ◽  
Zuo-Ze Fan ◽  
Ren-Hai Zhao ◽  
Fu-Xing Chen ◽  
...  
Keyword(s):  
Antibacterial Agent ◽  
Average Diameter ◽  
Element Distribution ◽  
Raw Material ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Technical Textiles ◽  
Twin Screw ◽  
And Performance ◽  
Fourier Transfer Infrared Spectroscopy

Polypropylene (PP) fibers are employed commonly as the raw material of technical textiles (nonwovens), and the research focuses on fine-denier fibers and their functionalities. In this work, antibacterial PP masterbatches with different dosage (1–5 wt.%) of nano-ZnO particles as the antibacterial agent were prepared via a twin-screw extruder. The as-prepared PP masterbatches were electrospun on a home-made electrospinning device to afford ultra-fine PP fibers. The morphologies of as-spun ultrathin PP fibers with 16 μm of average diameter were observed by SEM. The structure and element distribution were characterized by means of energy-dispersive spectroscopy (EDS) and Fourier-transfer infrared spectroscopy (FTIR), respectively. There was some zinc obviously distributed on the surface when a dosage of ZnO more than 1 wt.% was used, which contributed to the antibacterial activity. The crystallinity of PP fibers was not affected strongly by the dosage of ZnO based on the differential scanning calorimetry (DSC) heating curves, while thermal decomposition improved with the increase in ZnO content, and the mechanical strength decreased predictably with the increase in inorganic ZnO content.

scholarly journals From Disposal to Technological Potential: Reuse of Polypropylene Waste from Industrial Containers as a Polystyrene Impact Modifier

2020 ◽  
Vol 12 (13) ◽  
pp. 5272
Author(s):  
Carlos Bruno Barreto Luna ◽  
Danilo Diniz Siqueira ◽  
Eduardo da Silva Barbosa Ferreira ◽  
Wallisson Alves da Silva ◽  
Jessika Andrade dos Santos Nogueira ◽  
...  
Keyword(s):  
Impact Strength ◽  
Amorphous Matrix ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Elongation At Break ◽  
Torque Rheometry ◽  
Technological Potential ◽  
Twin Screw ◽  
Compatibilizing Agent ◽  
Recycled Material

The practice of recycling over the years has been increasingly encouraged, with the aim being the manufacturing of materials that contribute to sustainable development. In light of this, the present work evaluated the potential of mixtures of polystyrene (PS)/recycled copolymer polypropylene (PPr), using styrene-(ethylene/butylene)-styrene (SEBS) as a compatibilizing agent. Initially, the mixtures were prepared in a co-rotational twin-screw extruder, and, afterwards, the extruded granules were molded by injection. The properties of torque rheometry, impact strength, tensile properties, differential scanning calorimetry (DSC), heat deflection temperature (HDT), and scanning electron microscopy (SEM) were evaluated. The formulation PS/PPr/SEBS (70/20/10 %wt.) demonstrated an increase in viscosity, corroborating with an increase of 123% and 227% in the elongation at break and impact strength, respectively, compared to neat PS. Though the elastic modulus and tensile strength suffered losses, the reduction was not drastic. Furthermore, the addition of a semi-crystalline recycled material in the amorphous matrix (PS) contributed to an increase in thermomechanical strength, as seen in the HDT. The morphology revealed that SEBS is effective in making PS/PPr mixtures compatible because the dispersed phase is well adhered to the PS matrix and promotes greater morphological stability. Thus, it is possible to add value to discarded material and reduce the costs of the final product, which can reduce pollution.

Study on the Properties of LDPE/POE/Zeolite Molecular Sieves Composite Film

2011 ◽  
Vol 194-196 ◽  
pp. 2347-2350 ◽  
Author(s):  
Zi Nian Zhao ◽  
Xin Xin Nie ◽  
Rui Wang
Keyword(s):  
Mechanical Properties ◽  
Composite Film ◽  
Molecular Sieves ◽  
Testing Machine ◽  
Melt Blending ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Twin Screw ◽  
Ethylene Octene Copolymer ◽  
Blending Process

By means of melt blending process in a co-rotating twin screw extruder with two-step process, the low density polyethylene (LDPE)/ethylene octene copolymer (POE)/zeolite molecular sieves (ZMS) composites were prepared. The influence of ZMS on the crystallinity, mechanical properties and permeability was investigated by differential scanning calorimetry(DSC), universal testing machine and permeability tester, respectively. The results showed that the addition of ZMS made the crystallinity of composite film decreased and the growth rate of crystal nucleus promoted. As the content of ZMS rose, the mechanical properties of composite film decreased, while the CO2, O2permeability and the moisture permeability increased.

scholarly journals Nylon 66/nano CaCO3 composites

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Peipei Yuan ◽  
Jianshu Zhong ◽  
Xisheng Liu
Keyword(s):  
Calcium Carbonate ◽  
Crystallization Temperature ◽  
Polarized Light ◽  
Decomposition Temperature ◽  
Melt Blending ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Nylon 66 ◽  
Twin Screw ◽  
Half Height Width

The nylon 66/nano-CaCO3 composites were prepared by melt blending on a twin-screw extruder. Scanning electron microscopy (SEM), polarized light microscopy (PLM), thermal loss (TGA) and differential scanning calorimetry (DSC) The effects of nanometer calcium carbonate on the polycrystalline behavior and thermal properties of nylon 66/nano CaCO3 composites were investigated. The results show that the nanometer calcium carbonate particles are dispersed in the nylon 66 matrix and exist in the form of aggregates. The nanometer calcium carbonate has the effect of heterogeneous nucleation, which can reduce the size of the spherules. The decomposition temperature of the nylon 66 is 400 ℃, the addition of nano-CaCO3 to reduce the decomposition temperature. At the same time, DSC test showed that the β-crystalline form in the material reduced the melting temperature of the material. The addition of nano-CaCO3 in the nylon 66 matrix resulted in the decrease of the crystallization temperature and the increase of the half-height width of the endothermic peak. The lower the crystallization temperature, the wider the crystallization temperature range.

scholarly journals Tailoring Poly(lactic acid) (PLA) Properties: Effect of the Impact Modifiers EE-g-GMA and POE-g-GMA

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 136
Author(s):  
Edson Antonio dos Santos Filho ◽  
Carlos Bruno Barreto Luna ◽  
Danilo Diniz Siqueira ◽  
Eduardo da Silva Barbosa Ferreira ◽  
Edcleide Maria Araújo
Keyword(s):  
Lactic Acid ◽  
Glycidyl Methacrylate ◽  
Poly Lactic Acid ◽  
Screw Extruder ◽  
Crystallinity Degree ◽  
Twin Screw ◽  
Injection Molded ◽  
Packaging Industry ◽  
Poly Ethylene ◽  
The Impact

Poly(ethylene-octene) grafted with glycidyl methacrylate (POE-g-GMA) and ethylene elastomeric grafted with glycidyl methacrylate (EE-g-GMA) were used as impact modifiers, aiming for tailoring poly(lactic acid) (PLA) properties. POE-g-GMA and EE-g-GMA was used in a proportion of 5; 7.5 and 10%, considering a good balance of properties for PLA. The PLA/POE-g-GMA and PLA/EE-g-GMA blends were processed in a twin-screw extruder and injection molded. The FTIR spectra indicated interactions between the PLA and the modifiers. The 10% addition of EE-g-GMA and POE-g-GMA promoted significant increases in impact strength, with gains of 108% and 140%, respectively. These acted as heterogeneous nucleating agents in the PLA matrix, generating a higher crystallinity degree for the blends. This impacted to keep the thermal deflection temperature (HDT) and Shore D hardness at the same level as PLA. By thermogravimetry (TG), the blends showed increased thermal stability, suggesting a stabilizing effect of the modifiers POE-g-GMA and EE-g-GMA on the PLA matrix. Scanning electron microscopy (SEM) showed dispersed POE-g-GMA and EE-g-GMA particles, as well as the presence of ligand reinforcing the systems interaction. The PLA properties can be tailored and improved by adding small concentrations of POE-g-GMA and EE-g-GMA. In light of this, new environmentally friendly and semi-biodegradable materials can be manufactured for application in the packaging industry.

Sign in / Sign up

Export Citation Format

Share Document