<b>Analysis of physical, chemical e mechanical properties of wood-particle boards containing biaxially oriented polypropylene

Abstract The morphologies, crystalline structures, and thermal and rheological behaviors of isotactic polypropylene (iPP) blended with dicyclopentadiene based hydrogenated hydrocarbon resin (HCR) were investigated using scanning electron microscopy (SEM), wide-angle X-ray diffractometry, and differential scanning calorimetry in detail. Furthermore, the transparency, mechanical properties, and water vapor and oxygen permeability of biaxially oriented polypropylene films, fabricated from these iPP/HCR blends using a biaxial drawing machine, were examined. It was found that crystallinity varies with the HCR content of the iPP/HCR blend. In addition, amorphous HCR with its high glass transition temperature (Tg) upon blending with iPP’s amorphous structure affords improvements in various film properties, such as mechanical properties, transparency, and gas permeabilities.

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USE OF STARCH SYRUPS IN THE PRODUCTION OF JELLY

International Conference on Technics Technologies and Education ◽

10.15547/ictte.2019.07.027 ◽

2019 ◽

pp. 457-462

Author(s):

Kateryna Iorgachova ◽

Olga Makarova ◽

Karyne Avetisian

Keyword(s):

Mechanical Properties ◽

Carbohydrate Composition ◽

Foam Layer ◽

Quality Indices ◽

Organoleptic Quality ◽

Physical Chemical

In the presented work the choice of starch syrup for the jelly products production has been substantiated. It was based on the analysis of the starch syrup carbohydrate profiles and recipes of jelly products. The influence of syrup on the rheological and structural-mechanical properties of jelly and aerated masses for a two-layer jelly has been determined. The expediency of polydextrose usage has been demonstrated. Its adding leads to the regulation of the jelly structure and foam layer for the samples with more than 50% of sugar replaced by starch syrup. Depending on the ratio of carbohydrates in jelly it was determined the amount of polydextrose adding of which provides the required firming and prebiotic properties of finish products. The change of physical-chemical, structural-mechanical, and organoleptic quality indices of two-layer jelly with modified carbohydrate composition has been investigated during storage.

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Effect of wood particulate size on the mechanical properties of PLA biocomposite

Pigment & Resin Technology ◽

10.1108/prt-12-2019-0117 ◽

2020 ◽

Vol 49 (6) ◽

pp. 465-472

Author(s):

S. Raj Sachin ◽

T. Kandasamy Kannan ◽

Rathanasamy Rajasekar

Keyword(s):

Mechanical Properties ◽

Mechanical Characteristics ◽

Wood Flour ◽

Wood Particle ◽

Poly Lactic Acid ◽

Particle Sizes ◽

Content Type ◽

Particulate Size ◽

Practical Implications

Purpose The purpose of this study is to carry out an investigation of the role of the wood particle size on the mechanical properties of poly lactic acid (PLA)-reinforced neem fiber biocomposite. Design/methodology/approach Composite test specimens were processed by reinforcing neem wood flour (NWF) in two different particle sizes, micro-sized NWF (MNWF) and nano-sized NWF (NNWF) separately into PLA. Composites were extruded at four different fiber loadings (10, 15, 20 and 25 Wt.%) into PLA matrix. The MNWF and NNWF had particle sizes varying from 5 to 15 µm and 10 to 15 nm, respectively. Findings Tensile strength, flexural strength and impact strength of PLA increased with fiber reinforcement for both the MNWF and NNWF cases. The NNWF-reinforced PLA composite at 20 Wt.% fiber loading proved to be the best composite that had outstanding mechanical properties in this research. Practical implications The developed composite can be used as a substitute for conventional plywood for furniture, building infrastructure and interior components for the automobile, aircraft and railway sectors. Originality/value A new biocomposite had been fabricated by using PLA and NWF and had been tested for its mechanical characteristics.

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Characterization of electron-irradiated biaxially-oriented polypropylene films

IEEE Transactions on Nuclear Science ◽

10.1109/23.3697 ◽

1988 ◽

Vol 35 (3) ◽

pp. 1026-1029 ◽

Cited By ~ 13

Author(s):

A.N. Hammoud ◽

J.R. Laghari ◽

B. Krishnakumar

Keyword(s):

Biaxially Oriented Polypropylene ◽

Oriented Polypropylene ◽

Polypropylene Films

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Modification of mechanical properties of oriented polypropylene by ozone oxidation

Polymer Science U S S R ◽

10.1016/0032-3950(88)90272-9 ◽

1988 ◽

Vol 30 (1) ◽

pp. 177-182 ◽

Cited By ~ 5

Author(s):

A.A. Popov ◽

A.V. Russak ◽

Ye.S. Popova ◽

N.N. Komova ◽

G.Ye. Zaikov

Keyword(s):

Mechanical Properties ◽

Ozone Oxidation ◽

Oriented Polypropylene

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Prediction of Elastic Modulus of Glass Short Fiber/Wood Powder/Polypropylene Hybrid Composites

Volume 9: Mechanics of Solids, Structures and Fluids ◽

10.1115/imece2013-66679 ◽

2013 ◽

Author(s):

Ying Yu ◽

Manabu Nomura ◽

Hiroyuki Hamada

Keyword(s):

Mechanical Properties ◽

Elastic Modulus ◽

Hybrid Composites ◽

Length Distribution ◽

Wood Particle ◽

Short Fiber ◽

Injection Molding Process ◽

Orientation Factor ◽

Wood Powder ◽

Molding Process

Recent years, thermoplastics incorporated with particulate fillers have been gained high interests. To improve the mechanical properties of the natural particle reinforced polymer plastics, hybrid structure has been applied on the composite combining natural particle with stronger synthetic fibers. However, the reinforcing mechanism of the hybrid composite is quite complicated. Experiments on it may become time consuming and cost prohibitive. Therefore, researchers are interested in studying variable models to predict the elastic properties of the composites. In this study, glass short fiber/wood particle/pp hybrid composites were prepared by injection molding process at a fixed reinforcement to matrix ratio of 51:49. 4 kinds of hybrid specimens with glass fiber/wood particle ratios of 41:10, 31:20, 21:30 and 11:40 were fabricated. The effect of hybridization content on the mechanical properties of the composites was evaluated based on tensile test. Theoretically, the elastic modulus of hybrid composites was predicted by using the rule of hybrid mixtures (RoHM) equation and classical lamination theory (CLT) and the accuracy of the two estimation models has been discussed. Results showed that it can be considered the hybridization of wood powder into glass/PP composite could contribute to a similar high elastic modulus with high green degree. On the other hand, the fiber orientation factor, fiber length distribution factor, powder dispersion factor were very important factors and need to be considered in the prediction model.

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