Cellular Polymers最新文献_第4页

Investigating the role and impact of N₂ as a blowing agent in the fabrication of thermoplastic polyurethane foams 研究了N2作为发泡剂在热塑性聚氨酯泡沫制造中的作用和影响

4区医学

Cellular Polymers Pub Date : 2023-09-01 DOI: 10.1177/02624893231203376

Raghavendrakumar Rangappa, Shu-Kai Yeh

{"title":"Investigating the role and impact of N<sub>2</sub> as a blowing agent in the fabrication of thermoplastic polyurethane foams","authors":"Raghavendrakumar Rangappa, Shu-Kai Yeh","doi":"10.1177/02624893231203376","DOIUrl":"https://doi.org/10.1177/02624893231203376","url":null,"abstract":"Fabricating low-density elastomeric foams with a homogenous cell structure has been challenging because of foam shrinkage. The low modulus of the elastomers and the high diffusivity of blowing agents lead to foam shrinkage and poor surface quality. Using N 2 as a physical blowing agent (PBA) is an eco-friendly foaming method to overcome foam shrinkage. In this study, PTMEG-MDI/BD-based TPU with a hardness of 85A, 90A, and 95A were foamed using N 2 . Nitrogen as a blowing agent created a homogeneous cell structure with an expansion ratio of more than five times, an average cell size of less than 25 μm, and a cell density of more than 10 9 cells/cm 3 . The shrinkage ratio and cellular morphology of CO 2 - and N 2 -blown TPU foam were compared at their maximum expansion ratio. At the maximum expansion ratio, the N 2 -blown foams exhibited a fine cell structure with a shrinkage ratio of less than 4%. However, the CO 2 -blown TPU foam showed a shrinkage ratio of 12.7% with significant cracks in the sample. The results demonstrate that using N 2 as a blowing agent can achieve an expansion ratio similar to that of CO 2 -blown foam, and the shrinkage problems of elastomeric foams can be significantly eliminated, which may help to maintain the physical properties of the foam.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135388944","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

Mechanical and thermal properties of polyvinyl acetate foams reinforced with biopolymers 生物聚合物增强聚乙酸乙烯酯泡沫的力学和热性能

IF 1.6 4区医学

Cellular Polymers Pub Date : 2023-07-31 DOI: 10.1177/02624893231193501

M. E. Ergun, E. Ozen, N. Yildirim, Berk Dalkilic, Ergun Baysal

{"title":"Mechanical and thermal properties of polyvinyl acetate foams reinforced with biopolymers","authors":"M. E. Ergun, E. Ozen, N. Yildirim, Berk Dalkilic, Ergun Baysal","doi":"10.1177/02624893231193501","DOIUrl":"https://doi.org/10.1177/02624893231193501","url":null,"abstract":"The study developed and designed polyvinyl acetate (PVAc) foams using advanced freeze-drying technology, which exhibited good heat-insulating ability, flame retardancy, and mechanical properties. Different combinations of bleach kraft pulp, water-soluble chitosan, and zinc borate were used to reinforce the foams. The foams exhibited desirable compression and flexural properties, with compression strength and compression modulus ranging from 0.01 MPa to 0.08 MPa and 0.05 MPa to 0.29 MPa, respectively, while flexural strength and flexural modulus ranged from 0.12 MPa to 5.37 MPa and 9.86 MPa to 260,85 MPa, respectively. The use of zinc borate as a reinforcement resulted in improved thermal properties and reduced mass loss at 600°C by 20.69%. Thermal conductivity tests indicated that the foams had low thermal conductivity values ranging from 0.037 W/mK to 0.074 W/mK. The foams with zinc borate (60 g/L) and high molecular weight water-soluble chitosan (70 g/L) reinforcement exhibited high limiting oxygen index (LOI) of 28.72%. Overall, the results suggest that the PVAc foams could serve as a promising sustainable alternative in thermal insulation and construction fields.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47727941","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: 1

Influence of sodium-montmorillonite nanoclay on flammability, thermal stability, morphology, and mechanical properties of rigid water-blown palm oil-based polyurethane foam 钠蒙脱土纳米粘土对棕榈油基硬质水吹聚氨酯泡沫材料的可燃性、热稳定性、形态和力学性能的影响

IF 1.6 4区医学

Cellular Polymers Pub Date : 2023-03-01 DOI: 10.1177/02624893231193499

M. H. Dzulkifli, R. A. Majid, M. Yahya

引用次数: 0

Enhanced effect of chloroprene on the mechanical properties of polyurethane foams 氯丁二烯对聚氨酯泡沫力学性能的增强作用

IF 1.6 4区医学

Cellular Polymers Pub Date : 2023-03-01 DOI: 10.1177/02624893231191258

Masoumeh Hosseinpour, H. R. Ashjari, M. S. Seyed dorraji, M. Rastgouy-Houjaghan, Sheida Faraji

引用次数: 0

Effect of small amount of functionalized multi-walled carbon nanotubes on the properties of rigid polyisocyanurate and polyurethane foam composites 少量功能化多壁碳纳米管对硬质聚异氰脲酸酯和聚氨酯泡沫复合材料性能的影响

IF 1.6 4区医学

Cellular Polymers Pub Date : 2023-03-01 DOI: 10.1177/02624893231191838

R. Vlasov, D. Ryabova, Sakina Zeynalova, Marcel Nazmutdinov, Sergey Ryabov

引用次数: 0

Influence of particle geometry and size on the cell morphology of vacuum assisted rotationally molded foam 颗粒几何形状和尺寸对真空辅助旋转成型泡沫细胞形态的影响

IF 1.6 4区医学

Cellular Polymers Pub Date : 2023-03-01 DOI: 10.1177/02624893231171662

J. Werner, D. Drummer

{"title":"Influence of particle geometry and size on the cell morphology of vacuum assisted rotationally molded foam","authors":"J. Werner, D. Drummer","doi":"10.1177/02624893231171662","DOIUrl":"https://doi.org/10.1177/02624893231171662","url":null,"abstract":"An increased awareness of sustainability among the population leads, from an industrial point of view, to efforts to act more ecologically as well as to the aim for lower production costs and an increased efficiency. With this in mind, a new process has been developed for foaming without blowing agents in rotational molding. Process related air inclusions in the polymer melt are expanded to form the cell structure by means of vacuum application. In the presented study, the influence of different particle sizes as well as the arising potential of deploying microgranules in the otherwise powder-based process is investigated with regard to the resulting foam cells. The results confirm that particle size and form greatly influence the existence and size of air inclusions in the polymer melt. It could be proven that these differences, caused by the particle characteristics, propagate during the foaming process and lead to different cell morphologies in the resultant foam. Furthermore, it is indicated that qualitative predictions of the resulting cell dimensions can be made on the basis of bulk density measurements and the analysis of the sintering behaviour of the initial particles.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47754723","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

A study of the cell morphology and mechanical properties of bumper material PP-T-EPDM composite foam 保险杠材料PP-T-EPDM复合泡沫的细胞形态及力学性能研究

IF 1.6 4区医学

Cellular Polymers Pub Date : 2023-01-23 DOI: 10.1177/02624893231151363

S. Yetgin, H. Unal

引用次数: 0

Role of hemp fiber addition on thermal stability, heat insulation, air permeability and cellular structural features of rigid polyurethane foam 麻纤维添加量对硬质聚氨酯泡沫材料热稳定性、隔热性能、透气性及孔结构特性的影响

IF 1.6 4区医学

Cellular Polymers Pub Date : 2023-01-22 DOI: 10.1177/02624893231152383

U. Soykan, Ş. Kaya

{"title":"Role of hemp fiber addition on thermal stability, heat insulation, air permeability and cellular structural features of rigid polyurethane foam","authors":"U. Soykan, Ş. Kaya","doi":"10.1177/02624893231152383","DOIUrl":"https://doi.org/10.1177/02624893231152383","url":null,"abstract":"In this current study, rigid polyurethane foams (RPUFs) composites were prepared using different percentage (3, 6, 9 and 12%) of the hemp fibers via one-shut one-step polymerization method. The influences of the hemp fiber addition on the RPUFs were investigated meticulously by means of Fourier-transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TGA), thermal conductivity measurement and scanning electron microscopy (SEM) techniques by evaluating the alternations in the chemical structures of the component, thermal stability, apparent density, insulation performance and cellular topology of the produced samples. The structural analysis revealed that there existed the strong secondary chemical bonds between the functional groups belonging to the components and, depending on that, the improvement in the thermal stability of the foam samples was recorded accompanied by the formation of the better interfacial adhesion. Furthermore, thermal conductivity values of the hemp fiber-loaded RPUFs were observed to increase regularly with the increasing of the content level of the hemp fibers. This was explained by enhancement in the bulk phase conduction level depending of the apparent density rising, reduction in CO2 concentration inside cells as well as the formation of the distorted cellular structures. The obtained air permeability results displayed that the hemp fibers incorporated successfully with RPUF structure, which provides the occurrence of the novel micro barriers and pathways limiting the passage of the air throughout the matrix. The taken scanning electron microscopy images also indicated that the cellular morphology and dimensional stability of the produced foams affected negatively by the hemp fiber addition. At high contents, the wrinkled, non-uniform and irregular cellular structures were observed with ruptured and collapsed walls and struts.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43602186","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

Natural rubber/wood composite foam: Thermal insulation and acoustic isolation materials for construction 天然橡胶/木材复合泡沫:建筑用隔热和隔音材料

IF 1.6 4区医学

Cellular Polymers Pub Date : 2023-01-06 DOI: 10.1177/02624893231151364

Laura Neves de Alencar, Fábio Friol Guedes Paiva, F. Okimoto, G. Bacarin, Guilherme Dognani, L. O. Salmazo, R. J. dos Santos, F. Cabrera, A. Job

{"title":"Natural rubber/wood composite foam: Thermal insulation and acoustic isolation materials for construction","authors":"Laura Neves de Alencar, Fábio Friol Guedes Paiva, F. Okimoto, G. Bacarin, Guilherme Dognani, L. O. Salmazo, R. J. dos Santos, F. Cabrera, A. Job","doi":"10.1177/02624893231151364","DOIUrl":"https://doi.org/10.1177/02624893231151364","url":null,"abstract":"With the advances in the field of civil construction and the world population growth, the development of policies is necessary for the management and reuse of generated residue. Thus, the present work proposes the use of expanded natural rubber as a polymeric matrix incorporated with eucalyptus filler as a reinforcing filler for the production of composites. Thermal insulation capacity was determined by the transient plane source and acoustic method by impedance tube. NR/W40 foam showed enhanced the acoustic insulation capacity. The maximum absorption of NR/W40 was 0.83, at 3257 Hz, which is three times higher than natural rubber foam. Highly inhomogeneous cell structures were observed with large, interconnected pores, improving the acoustic performance. Sound absorption coefficient for natural rubber foam with 40% wood (0.83 ± 0.046) was similar to PU foam (0.97 ± 0.009) with 20 mm in thickness, a density of 47 kg/m3 and 98% open cell content it is a well-known acoustic absorbent in the building sector. The NR/W40 sample recorded the best acoustic performance among the NR foams analyzed in this work, maintaining good sound absorption above 1500 Hz, demonstrating a possibility of wood reuse as a filler in based-rubber foam for acustic insulation.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45703032","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

Density graded polymer composite foams 密度梯度聚合物复合泡沫

IF 1.6 4区医学

Cellular Polymers Pub Date : 2022-11-30 DOI: 10.1177/02624893221143507

Xuemei Tan, D. Rodrigue

引用次数: 2