Cellular Polymers最新文献_第6页

Effect of rare earth nucleating agent on supercritical CO2 foaming behavior of block copolymerized polypropylene 稀土成核剂对嵌段共聚聚丙烯超临界CO2发泡行为的影响

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-11-14 DOI: 10.1177/02624893211053678

Yun Zhang, Yadong He, C. Xin, Yan-Qun Su

{"title":"Effect of rare earth nucleating agent on supercritical CO2 foaming behavior of block copolymerized polypropylene","authors":"Yun Zhang, Yadong He, C. Xin, Yan-Qun Su","doi":"10.1177/02624893211053678","DOIUrl":"https://doi.org/10.1177/02624893211053678","url":null,"abstract":"The rare earth nucleating agent was used to modify block copolymerized polypropylene (PPB) in foaming process. The results show that the crystallization of PPB and the melting temperature of β-crystal increased gradually with increased β-crystal nucleating agent content. The total crystallinity decreased with amount of addition increasing, and the relative content of β-crystal increased first and then decreased. When β-crystal nucleating agent content was 0.4 wt%, the relative β-crystal content reached the maximum value of 95.27%, and the final crystal grain refinement significantly. The addition of rare earth β-crystal nucleating agent has a good effect on improving the uniformity of foam cells. Under the same content of β-crystal nucleating agent and pressure, the average cell diameter and expansion ratio increased with the saturation temperature increasing. After the foaming temperature reaches 155°C, the expansion ratio began to decrease, which was also consistent with the changed trend of relative β-crystal content. At the same content of temperature and relative β-crystal, as the foaming pressure increased, the cell diameter decreased gradually, and the expansion ratio increased first, and then decreased.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2021-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47136408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical modeling of longitudinal piezoelectric characteristic for cellular polymers 多孔聚合物纵向压电特性的理论建模

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-11-05 DOI: 10.1177/02624893211055830

Ikram Najihi, C. Ennawaoui, A. Hajjaji, Y. Boughaleb

{"title":"Theoretical modeling of longitudinal piezoelectric characteristic for cellular polymers","authors":"Ikram Najihi, C. Ennawaoui, A. Hajjaji, Y. Boughaleb","doi":"10.1177/02624893211055830","DOIUrl":"https://doi.org/10.1177/02624893211055830","url":null,"abstract":"Efficient energy harvesting is a difficult challenge that consists in the development of systems allowing charging autonomous and low-power devices. In addition to traditional piezoelectric polymers, mono-crystals, and ceramics, cellular electrets offer consistent solutions by converting wasted vibration energy from the environment to usable electrical energy. This paper presents an electromechanical model to study the energy harvesting capability of cellular polymers. The theoretical study models the response of these materials to investigate the effect of different parameters on the piezoelectric coefficient d33, particularly. The model considers the percentage of porosity, surface charge density in each polymer–gas surface, the properties of the polymer matrix and the gas encapsulated in the pores, and the Young’s modulus of the porous film. For poly(ethylene-co-vinyl acetate), the results showed that the piezoelectric performance of the film declines with the increase of the film thickness. However, the variation of the d33 as a function of the percentage of porosity is exponential and can achieve 4.24 pC/N for a porosity of 80%. Compared to a previously published experiment, the theoretical results have proven a good agreement with only 3.3% error.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2021-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46215130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Preparation and properties of high melt strength PBS and its environmentally friendly foaming materials 高熔体强度PBS及其环保发泡材料的制备与性能

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-10-30 DOI: 10.1177/02624893211053674

Xiao-Ming Zhou, Yi-fan Liu

引用次数: 0

Microbubble technology for natural rubber latex foam production: The use of various gas-filled microbubbles 天然胶乳泡沫生产中的微气泡技术：各种充气微气泡的使用

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-10-23 DOI: 10.1177/02624893211053672

Kuntida Katkeaw, M. Khangkhamano, R. Kokoo

引用次数: 2

Optimization of structural parameters on hollow spherical cells manufactured by Fused Deposition Modeling (FDM) using Taguchi method 采用田口法对FDM空心球胞的结构参数进行优化

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-09-01 DOI: 10.1177/02624893211043324

N. B. Ali, M. Khlif, D. Hammami, C. Bradai

{"title":"Optimization of structural parameters on hollow spherical cells manufactured by Fused Deposition Modeling (FDM) using Taguchi method","authors":"N. B. Ali, M. Khlif, D. Hammami, C. Bradai","doi":"10.1177/02624893211043324","DOIUrl":"https://doi.org/10.1177/02624893211043324","url":null,"abstract":"There is a growing need for 3D printing of polymer structures in a cost-effective way and green. This study presents an experimental approach to investigate structural parameters effects on mechanical properties of polylactic acid (PLA) hollow-sphere structures manufactured with fused deposition modeling (FDM). The mechanical behavior characteristics of square_hexagonal stacking, closed_open porosity and parallel_perpendicular compression direction compared to the direction of manufacture under quasi-static uniaxial compression are examined using Taguchi method. The S/N ratio analysis and the Analysis of Variance (ANOVA) were used to find the optimal parameters that improve the mechanical properties (Young modulus, yield strength) and to provide a significant ranking of the different parameters analyzed in this paper. It was found that the optimum level and significance of each process parameter vary for “hexagonal cells,” “open porosity” and “parallel direction.” The optimal values of the results give a Young modulus E of 90.12 MPa and a yield strength σ y of 3 MPa. Furthermore, the experimental results further reveal that the porous structure with the loading direction that is parallel to the direction of manufacture, has a higher strength and a progressive collapse of the cells to those with a perpendicular direction.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44865241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Morphological evaluation of microcellular foamed composites developed through gas batch foaming integrating Fused Deposition Modeling (FDM) 3D printing technique 集成熔融沉积建模（FDM）3D打印技术的气批发泡微孔发泡复合材料的形态评价

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-08-24 DOI: 10.1177/02624893211040938

G. Radhakrishna, Rupesh Dugad, A. Gandhi

{"title":"Morphological evaluation of microcellular foamed composites developed through gas batch foaming integrating Fused Deposition Modeling (FDM) 3D printing technique","authors":"G. Radhakrishna, Rupesh Dugad, A. Gandhi","doi":"10.1177/02624893211040938","DOIUrl":"https://doi.org/10.1177/02624893211040938","url":null,"abstract":"In this article, the development of microcellular structure foams has developed by integrating the two successful and existing technologies, namely CO2 gas batch foaming and Fused Deposition Modeling (FDM) 3D printing technique. It is a novel approach to manufacture complex design porous products for customized applications. The eventual cell morphologies of the extruded 3D printing filament depends on the process parameters pertaining to both microcellular foaming and 3D printing processes. Further, morphological study has been conducted to evaluate the cell morphologies of the 3D printing filament developed through customized FDM setup. During this process, the significance of various process parameters including saturation pressure, saturation time, desorption time, feed rate and extrusion temperature were thoroughly studied. To pursue this study base material used was acrylonitrile butadiene styrene (ABS). The 3D printed filaments consisted of cells with an average cell size in the range of 2.3–276 µm and the average cell density in the range of 4.7 × 104 to 4.3 × 109 cells/cm3. Finally, it has found that by controlling the process parameters different cell morphologies can be developed as per the end application.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2021-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47959853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Development and investigation of the applicability of microstructural models for polymeric low density foams directly obtained from computed tomography data 从计算机断层扫描数据直接获得的聚合物低密度泡沫微观结构模型的发展和适用性研究

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-08-24 DOI: 10.1177/02624893211041674

Anna Hössinger-Kalteis, J. Maurer, M. Reiter, M. Jerabek, Z. Major

引用次数: 2

A study on fabrication of nanocomposite polyethylene foam through extrusion foaming procedure 挤出发泡法制备纳米复合聚乙烯泡沫材料的研究

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-08-20 DOI: 10.1177/02624893211040949

M. Rostami, T. Azdast, R. Hasanzadeh, M. Moradian

{"title":"A study on fabrication of nanocomposite polyethylene foam through extrusion foaming procedure","authors":"M. Rostami, T. Azdast, R. Hasanzadeh, M. Moradian","doi":"10.1177/02624893211040949","DOIUrl":"https://doi.org/10.1177/02624893211040949","url":null,"abstract":"Foaming a polymer not only turns it into a lightweight material but also gives some special properties to it. However, the most important issue is controlling the foaming process to achieve a desirable structure with high cell density and low relative density. In the present study, the extrusion foaming process of polyethylene was studied through stepwise amendments. An innovative extrusion system was designed and implemented to produce extrusion foams under different material and process conditions using N2 as blowing agent. In the first step, the final cooling condition was investigated. The air-cooling condition led to a higher cell density/lower cell size compared to the water-cooling condition although a higher relative density was obtained. In the second step, the effects of the addition of talc and the synergetic effect of talc/nanoclay at different contents were investigated in detail. The hybrid of talc/nanoclay had a noticeably improving effect on the cellular structure. In the third step, the effects of processing parameters including the die temperature and screw speed were studied on the foam properties. Finally, up to 49.4% decrease in the relative density of samples was observed, also cell densities up to 2.5 × 104 cell/cm3 and cell sizes as small as 280 µm were achieved.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2021-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47333762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

An efficient and environment friendly bio-based polyols through liquefaction: Liquefaction temperature and catalyst concentration optimization and utilized for rigid polyurethane foams 一种高效环保的液化生物基多元醇：液化温度和催化剂浓度的优化及其在硬质聚氨酯泡沫中的应用

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-05-28 DOI: 10.1177/02624893211017271

C. Patel, Nikhil R Dhore, Amit A. Barot, Raju V. S. N. Kothapalli

{"title":"An efficient and environment friendly bio-based polyols through liquefaction: Liquefaction temperature and catalyst concentration optimization and utilized for rigid polyurethane foams","authors":"C. Patel, Nikhil R Dhore, Amit A. Barot, Raju V. S. N. Kothapalli","doi":"10.1177/02624893211017271","DOIUrl":"https://doi.org/10.1177/02624893211017271","url":null,"abstract":"Aiming towards the liquefaction of paddy straw was accumulation as well as providing a technically viable route leading to preservation of the natural resources and environment, the paddy straw was chemically liquefied. Paddy straw were liquefied into bio-based polyol in the presence of castor oil and blend of castor and karanja oil as depolymerizing agent and P-Toluene sulfonic acid as catalyst. Liquefied product was characterized by chemical as well as analytical techniques. The agricultural waste base paddy straw was eventually converted into polymeric precursor (polyol) monomer with nearly 80 to 95% yield by employing 2% catalyst concentration and at optimized temperature of 180°C. Synthesized polyol can be utilized further in formulating high quality rigid polyurethane foams. The foams were characterized in terms of their physical, mechanical, thermal and morphological properties. All foams exhibit good compressive strengths and thermal stability. Thermal conductivity of foams varied between 0.012 and 0.023 Kcal/mh°C, with the lowest being of foam from liquefied (LP), making it suitable for utilization as an insulation material.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/02624893211017271","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42008508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Morphological, thermal and mechanical properties of polypropylene foams via rotational molding 通过旋转模塑聚丙烯泡沫塑料的形态、热学和机械性能

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-05-25 DOI: 10.1177/02624893211018825

Y. Dou, D. Rodrigue

引用次数: 5