polymer composite material
Recently Published Documents


TOTAL DOCUMENTS

300
(FIVE YEARS 162)

H-INDEX

17
(FIVE YEARS 4)

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 338
Author(s):  
Anton Mostovoy ◽  
Andrey Shcherbakov ◽  
Andrey Yakovlev ◽  
Sergey Arzamastsev ◽  
Marina Lopukhova

The possibility of using graphene oxide as a modifying additive for polymer fiber-reinforced composites based on epoxy resin and basalt roving has been studied. The content of graphene oxide in the system has been experimentally selected, which has the best effect on the physico-mechanical properties of the obtained polymer composite material. The efficiency of the modification of the graphene oxide surface with APTES finishing additives and aminoacetic acid, which provides chemical interaction at the polymer matrix–filler interface, has been considered. The influence of graphene oxide and functionalizing additives on the polymer curing process was investigated using the thermometric method and differential scanning calorimetry.


2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Richard J. G. Löffler ◽  
Martin M. Hanczyc ◽  
Jerzy Gorecki

AbstractIn a recently published paper (doi.org/10.3390/molecules26113116) on self-propelled motion of objects on the water surface, we described a novel surface-active plastic material obtained by dissolution of camphor and polypropylene in camphene at 250 $$^\circ$$ ∘ C. The material has wax-like mechanical properties, can be easily formed to any moldable shape, and allows for longer and more stable self-propelled motion if compared with pure camphor or pure camphene or of a camphene-camphor wax. Here we use scanning electron microscopy to visualize and characterize the microporous structure of the solid polypropylene foam formed in the plastic for different polypropylene contents. The topology of foams remaining in the material after camphor and camphene molecules have been removed through evaporation or dissolution is similar to polypropylene foams obtained using thermally-induced phase separation. We show that the foams have a superhydrophobic surface but strongly absorb non-polar liquids, and suggest an array of potential scientific and industrial applications.


2022 ◽  
Vol 1217 (1) ◽  
pp. 012008
Author(s):  
N H M Siti ◽  
W H Choong

Abstract A knowledge of the material constituents and fabrication process is generally required for easing the composite material properties study and characterization. This paper presents the methodology of aramid reinforced polymer composite material preliminary assessment and fabrication. The demonstration is carried out through the development of mechanical properties characterization specimen. The composite material specimen is fabricated by utilizing the open mould with hand lay-up method, where three types of laminates include of unidirectional, orthotropic, quasi-isotropic cross plies are demonstrated. A template is applied for preparing specific fibre orientation 45°angle. Plies are lay accordingly with guided by a square guide for minimizing the off-orientation angle defect. Preliminary assessment is included of verification of unidirectional aramid fabric quality, cured specimen physical defect, internal defect through micrography analysis and material volume fraction prediction. Average specimen fibre volume fraction of 0.64 is predicted by determined the fibre filament geometry detail through micrography analysis. There are several fabrication defects had been identified. The defect identification findings shall be referred for further improvement of material preparation and fabrication method.


Author(s):  
Oleg Bashkov ◽  
Anton Bryansky ◽  
Timofey Efimov ◽  
Roman Romashko

The work is devoted to the study of the mechanisms of damage accumulation in a polymer composite material (PCM) during fatigue loading. Mechanical testing of a fiberglass sample was carried out by cyclic tension accompanied by registration of acoustic emission (AE). For the recorded AE signals, the Fourier spectra were calculated and used for clustering with Kohonen self-organizing map. Relations between clusters and types of damage in the PCM structure were established. The analysis of the peak frequencies of the Daubechies D14-wavelet components of AE signals was carried out. Obtained results has allows one to describe the processes of destruction in the PCM sample. It has been established that, on the base of local formation of microdamages in the matrix and the fracture of the fibers detected during recording of the AE data, it is possible to predict the destruction of the polymer composite material, while the beginning of a material destruction can be registered if the damage identified as an adhesion failure is observed. Perspectives of application of adaptive fiber-optic AE sensors for structural monitoring of PCMs on the base of preliminary experimental results are considered and discussed.


2021 ◽  
Vol 79 (12) ◽  
pp. 1169-1178
Author(s):  
Dulip Samaratunga ◽  
Joseph Severino ◽  
Shant Kenderian

Ultrasonic longitudinal wave propagation is studied in out-of-autoclave (OoA) carbon fiber–reinforced polymer composite material with varying levels of porosity contents. A combination of cure pressures and a solvent is used to produce specimens with void contents in the range of 0% to 22%. Ultrasonic measurements are made in through-transmission mode, and the data is processed to study various aspects of wave interaction with porosity in OoA specimens. The specimens with a wide range of void contents have enabled the study of broader trends of ultrasonic center frequency, wave velocity, and attenuation with respect to porosity. Results show ultrasonic center frequency and wave velocity are decreased linearly as the void content increases. The relationship of ultrasonic wave attenuation can be approximated by a logarithmic relationship when considering the full range of void content studied. Strength measurements of specimens with varying void contents are made using the flatwise tensile (FWT) test. It is observed that the strength rapidly decreases with increasing porosity. Correlations made between FWT strength, ultrasonic wave velocity, and attenuation are best described by logarithmic relationships. The data shows a potential for inferring strength knockdowns due to the presence of porosity based on ultrasonic measurements.


TEM Journal ◽  
2021 ◽  
pp. 1597-1604
Author(s):  
Aleksandr L. Medvedskiy ◽  
Mikhail I. Martirosov ◽  
Anton V. Khomchenko ◽  
Darina V. Dedova

This work is devoted to numerical analysis of the behaviour of reinforced cylindrical shell made of a polymer composite material (PCM) under the action of an unsteady shock load, taking into account interlayer defects of elliptical shape, as well as evaluate the strength of composite package and the development of delaminations.


Author(s):  
Д.В. Чащилов ◽  
Л.А. Злочевский ◽  
А.Е. Струкова ◽  
И.Н. Павлов

Для теплоизоляционных полимерных композиционных материалов (ПКМ) с наполнителем из целлюлозных волокон одним из актуальных вопросов является изменение плотности волокнистой матрицы под действием внешних механических нагрузок. Предметом экспериментального исследования явились образцы разрыхленной небелёной древесной сульфитной целлюлозы из хвойной древесины в воздушно-сухом состоянии. Цель исследования – оценка изменения насыпной плотности разрыхленной целлюлозы от величины давления прессования при малых давлениях прессования. В экспериментальных исследованиях использован метод денсиметрии. Из целлюлозной папки в лабораторных условиях получены образцы разрыхленной целлюлозы путём механического разволокнения. Использован лабораторный колковый рыхлитель роторного действия. Разрыхление проведено при окружной скорости ротора 50 м/с. Давление прессования варьировалось от 0 до 7,5 кПа. Получены образцы разрыхленноё целлюлозы с насыпной плотностью от 11,1 до 100,0 кг/м3. Эксперименты проведены с трёхкратным повторением. Показано, что при увеличении давления прессования насыпная плотность целлюлозы стабильно возрастает. В исследованном диапазоне давлений прессования уплотнение целлюлозы проходит в два этапа. На первом этапе при давлении прессования от 0 до 5 кПа насыпная плотность возрастает от 11,1 до 87,5 кг/м3. На втором этапе, при давлении прессования свыше 5 кПа, насыпная плотность возрастает с 87,5 до 100 кг/м3. На втором этапе замедление нарастания насыпной плотности при росте давления прессования может быть обусловлено деформацией элементарных волокон целлюлозы. Результаты экспериментального исследования могут быть применены для создания теплоизоляционных ПКМ на основе целлюлозных волокон. For heat-insulating polymer composite materials (PCM) with a cellulose fiber filler, one of the topical issues is the change in the density of the fiber matrix under the influence of external mechanical loads. The subject of the experimental study was samples of loosened unbleached wood sulfite cellulose from coniferous wood in an air-dry state. The aim of the study is to assess the change in the bulk density of loosened pulp from the value of the pressing pressure at low pressing pressures. In experimental studies, the method of densimetry was used. Samples of loosened cellulose were obtained from the pulp folder under laboratory conditions by mechanical de-fibration. A laboratory rotary chopper was used. Loosening was carried out at a circumferential rotor speed of 50 m / s. The pressing pressure varied from 0 to 7.5 kPa. Samples of loosened cellulose with a bulk density from 11.1 to 100.0 kg/m3were obtained. The experiments were carried out in three-fold repetition. It is shown that with an increase in the pressing pressure, the bulk density of cellulose steadily increases. In the studied range of pressing pressures, the pulp compaction takes place in two stages. At the first stage, at a pressing pressure of 0 to 5 kPa, the bulk density increases from the initial value 11.1 to 87.5 kg / m3. At the second stage, when the pressing pressure exceeds 5 kPa, the bulk density increases from 87.5 to 100 kg/ m3. At the second stage, the slowdown in the increase in bulk density with an increase in the pressing pressure can be caused by the deformation of the elementary cellulose fibers. The results of the experimental study can be used to create heat-insulating PCM based on cellulose fibers.


2021 ◽  
Author(s):  
Tamara Storodubtseva ◽  
Anna Korotkaya ◽  
V. Kitaev

In this work, a wood composite material is considered, which incorporates all the best properties of the known wood polymer composites: water resistance, moisture resistance, high bending strength. It was concluded that according to the criterion of resistance to temperature fluctuations, it is possible to give more complete recommendations on the optimal composition of the wood polymer composite material based on a two-factor study. To ensure comparability of optimization results for a number of other properties, a series of computer experiments was carried out according to the same plan as for the study of compression resistance, that is, the concentration of wood and at the same time the concentration of sand was changed from 10 to 50 % with a step of 10 %, respectively. The material has acquired new advantages, which do not have known analogues – the possibility of using any wood waste, higher strength due to the content of sand in the composition, cheaper production due to the fact that most of the components of the material are household and wood waste, namely waste from the woodworking and forestry industries in the form of chips, sawdust, chips, lump waste, as well as sand, which is a publicly available and inexpensive material.


Sign in / Sign up

Export Citation Format

Share Document