Processing and properties of polymeric nano‐composites

Wang, Hua; Zeng, Changchun; Elkovitch, Mark D.; Lee, L. James; Koelling, Kurt W.

doi:10.1002/pen.10899

Cited by 162 publications

(115 citation statements)

References 18 publications

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“…However, for HMW, MMW, and LMW series, incorporation of 10 wt% organoclay reduces the impact strength of the matrix by about 20, 30, and 45%, respectively. These decreases are significantly smaller than the 87% reported for PS compounded with 10 wt% of three different types of organoclay [7].…”

Section: Effects Of Polymer Grade On Mechanical Propertiescontrasting

confidence: 43%

Melt compounding of different grades polystyrene with organoclay. Part 3: Mechanical properties

et al. 2005

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We discuss the effects of the melt compounding variables, matrix molecular weight and organoclay content on the X‐ray diffraction (XRD) and mechanical properties of polystyrene (PS)/organoclay nanocomposites (PNC) prepared in a twin‐screw extruder. An increase of residence time reduced the height of the first XRD peak and increased that of the second peak. Barrel temperature and screw configuration had a little influence on the tensile properties and impact strength. Young's modulus increased with organoclay content and it was almost independent of matrix PS molecular weight. The stress‐at‐break and impact strength decreased with organoclay content and increased with PS molecular weight. Young's modulus and impact strength decreased with residence time. Since the slopes of these dependencies for PNC were similar to that of the neat PS, the matrix degradation seems to play the major role. The relationship between impact strength and elongation at break of PNC showed high dependency on matrix grade. However, better empirical correlation was observed between the impact and tensile strengths. According to theoretical model of Ji et al. [32], the Young's modulus vs. clay concentration dependence indicated the presence of low interphase thickness. POLYM. ENG. SCI. 45:827–837, 2005. © 2005 Society of Plastics Engineers

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Section: Effects Of Polymer Grade On Mechanical Propertiescontrasting

confidence: 43%

Melt compounding of different grades polystyrene with organoclay. Part 3: Mechanical properties

et al. 2005

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“…The mechanical properties of starch-based polymer blends are influenced by the dispersion of starch in the main polymer, because the dispersion primarily determines the microstructure of the blend [41]. By the incorporation of starch into the LDPE, a polar discontinuous phase forms in a nonpolar continuous phase of the LDPE [38].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Thermal, Mechanical and Antibacterial Properties of Ldpe/Starch Bio-Based Polymer Blends for Food Packing Applications

Yamak¹

2016

Journal of the Turkish Chemical Society, Section A: Chemistry

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Abstract:In this study, low density polyethylene (LDPE) was melt-blended with starch using twin screw extruder to form biodegradable polymer blends. The LDPE/starch blend films used in food packing were obtained by hot pressing of the granules produced by extrusion process. The starch content was varied from 0 to 40 wt% of LDPE. To provide fine starch dispersion, glycerol and zinc stearate were used as plasticizer and compatibilizer, respectively. The effect of starch content on the properties of LDPE film was investigated. A good dispersion was achieved for low starch contents (10 and 20 wt%), but agglomeration of the starch particles occurred in the presence of high amounts of starch (>20 wt%). The addition of starch to LDPE reduced the tensile strength, elongation at break, crystallinity, and water resistance of LDPE. This decline in the LDPE properties was dramatic when the starch content was increased to 30 wt% in the blend. In addition, silver nanoparticles as antibacterial agent were incorporated to the biodegradable LDPE blends where LDPE/starch weight ratio of 60/40. The effects of these nanoparticles on morphological, mechanical, thermal and water resistance properties of the LDPE/starch biodegradable blends were investigated. It was observed that the incorporation of nanoparticles to the LDPE/starch blend was completely changed the morphology of the film, and accordingly, the mechanical, thermal, and water resistance properties were varied depending on the silver nanoparticle content in LDPE/starch blend film. Moreover, antibacterial activities of the nanocomposite films against gram-negative bacteria (E. coli) and grampositive bacteria (S. aureus) were determined by measuring the inhibition zone around each film. However, the nanocomposite films did not show any antibacterial activities in the presence of silver nanoparticles as an antibacterial agent.

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“…In an exfoliated structure, the individual silicate layers are fully separated and uniformly dispersed in the polymer matrix. The nanocomposites based on layered-silicate clay with intercalated and exfoliated structures are desirable, which have been shown to have improved strength and modulus [10][11][12][13][14][15][16][17][18], decreased gas and water permeability [10,13], and increased thermal stability and flame resistance [9,11,13]. The better properties of the nanocomposites are attributed to the high aspect ratio and large surface area of the layered silicates, and the strong interactions between the polymer chains and layered silicates.…”

Section: Introductionmentioning

confidence: 99%

Nylon 66/clay nanocomposite structure development in a twin screw extruder

Lin

Thümen

Heim

et al. 2009

Polymer Engineering & Sci

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Nylon 66/clay nanocomposites were prepared in a Berstorff ZE25A UTX Ultra-glide corotating twin screw extruder at 2708C. Two types of extruder configurations with different mixing sections were used. One comprised two kneading block sections in the screws (KB only) and the other had a combination of a multiprocess-element (MPE) section and a kneading block section. Samples at eight different locations along the extruder screw were obtained and analyzed using scanning electron microscope and transmission electron microscope to examine the morphology development of clay inside nylon down the length of the extruder. It is found that the clay aggregates are quickly broken into smaller tactoids (micron size) and then even much smaller clay bundles (nanometer size) and single clay platelets in the first mixing section. The structure changes in the second mixing section are much less significant. X-ray diffraction (XRD) analysis of the nanocomposite products showed small, or disappearance of, characteristic XRD (001) peaks, which indicates partial exfoliation, or complete exfoliation,

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Processing and properties of polymeric nano‐composites

Cited by 162 publications

References 18 publications

Melt compounding of different grades polystyrene with organoclay. Part 3: Mechanical properties

Melt compounding of different grades polystyrene with organoclay. Part 3: Mechanical properties

Thermal, Mechanical and Antibacterial Properties of Ldpe/Starch Bio-Based Polymer Blends for Food Packing Applications

Nylon 66/clay nanocomposite structure development in a twin screw extruder

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