Cellular Polymers最新文献_第7页

Improvement of thermal conductivity of rigid polyurethane foams with aluminum nitride filler 氮化铝填料对硬质聚氨酯泡沫塑料导热性能的改善

IF 1.6 4区医学

Cellular Polymers Pub Date : 2021-03-01 DOI: 10.1177/0262489321988970

Serife Akkoyun, Meral Akkoyun

引用次数: 6

An in vitro evaluation on polyurethane foam sheets of the insertion torque, removal torque values, and resonance frequency analysis (RFA) of a self-tapping threads and round apex implant 聚氨酯泡沫片对自攻螺纹和圆顶端植入物插入扭矩、移除扭矩值和共振频率分析（RFA）的体外评估

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-11-25 DOI: 10.1177/0262489320971796

M. Tumedei, A. Piattelli, A. Falco, F. de Angelis, F. Lorusso, M. Di Carmine, G. Iezzi

引用次数: 8

Foaming behavior of 1-vinyl-2-pyrrolidone–methyl methacrylate copolymers under ScCO2 1-乙烯基-2-吡咯烷酮-甲基丙烯酸甲酯共聚物在ScCO2下的发泡行为

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-08-04 DOI: 10.1177/0262489320929226

Miriam Trigo-lopez, José A. Reglero Ruiz, Saúl Vallejos, C. Ramos, S. Beltrán, F. García, J. García

引用次数: 1

Morphological evaluation of ultralow density microcellular foamed composites developed through CO2-induced solid-state batch foaming technique utilizing water as co-blowing agent 以水为共发泡剂，采用co2诱导固态间歇发泡技术制备的超低密度微孔泡沫复合材料的形态评价

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-07-01 DOI: 10.1177/0262489319897633

Rupesh Dugad, G. Radhakrishna, A. Gandhi

引用次数: 8

Achievements and prospects for the synthesis of poly(meth)acrylimide foams. Stage of the thermal imidisation of polymer precursors 聚（甲基）丙烯酰亚胺泡沫合成的成就与展望。聚合物前体的热酰亚胺化阶段

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-07-01 DOI: 10.1177/0262489320934258

O. Kazantsev, K. V. Shirshin, P. V. Kornienko, A. P. Sivokhin

引用次数: 2

Thermal conductivity and conditioning of grey expanded polystyrene foams 灰色发泡聚苯乙烯泡沫的导热性和热处理

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-06-26 DOI: 10.1177/0262489320934263

A. Simpson, Ig Rattigan, E. Kalavsky, G. Parr

{"title":"Thermal conductivity and conditioning of grey expanded polystyrene foams","authors":"A. Simpson, Ig Rattigan, E. Kalavsky, G. Parr","doi":"10.1177/0262489320934263","DOIUrl":"https://doi.org/10.1177/0262489320934263","url":null,"abstract":"This article focuses on the thermal conductivity of 50 mm thick silver grey (infrared absorbing) expanded polystyrene (EPS) foam boards blown with pentane. The effect of short-term ageing from the point of production, by ambient conditioning at 23°C/50% RH, is compared to conditioning at an elevated temperature of 70°C. The declared thermal properties of the product and CE certification are fulfilled by the requirements of the European EPS product standard and SG19 Guidance. Measured thermal conductivity levels within 1% of the final value are acceptable and considered representative throughout the economic life of the product. Levels within the criteria were determined for 50 mm silver EPS after conditioning for 5 days at an elevated temperature of 70°C, whereas for conditioning at 23°C/50% RH the time taken was 23 days. The latter time is in good accord with retesting retained grey EPS boards of similar density and up to 9 years old, after initial testing 22 days from production, and conditioning at 23°C/50% RH. Elevated temperature conditioning increases the rate of diffusion of the blowing agent, but there has been concern about EPS beads softening above 60°C. Although there is little evidence from scanning electron microscopy of significant increase in perforation of the cell membranes at elevated temperatures, there is some indication of a small increase in wrinkling of the walls and intercell skeletal strands at 60°C and 70°C. It takes longer to eliminate the pentane gas by conditioning at 23°C/50% RH but there is no risk of material change from heat conditioning.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"39 1","pages":"238 - 262"},"PeriodicalIF":1.6,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489320934263","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46025099","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

Gas transport properties of cellular hollow fiber membranes based on LLDPE/LDPE blends 基于LLDPE/LDPE共混物的蜂窝中空纤维膜的气体传输性能

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-06-10 DOI: 10.1177/0262489320929300

Z. Razzaz, A. Mohebbi, D. Rodrigue

引用次数: 2

Cell structure and mechanical properties of microcellular PLA foams prepared via autoclave constrained foaming 高压釜约束发泡法制备微孔PLA泡沫的细胞结构和力学性能

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-06-05 DOI: 10.1177/0262489320930328

Jinwei Chen, Ling Yang, Dahua Chen, Qunshan Mai, Meigui Wang, Lixuan Wu, Ping Kong

{"title":"Cell structure and mechanical properties of microcellular PLA foams prepared via autoclave constrained foaming","authors":"Jinwei Chen, Ling Yang, Dahua Chen, Qunshan Mai, Meigui Wang, Lixuan Wu, Ping Kong","doi":"10.1177/0262489320930328","DOIUrl":"https://doi.org/10.1177/0262489320930328","url":null,"abstract":"Microcellular polylactic acid (PLA) foams with various cell size and cell morphologies were prepared using supercritical carbon dioxide (sc-CO2) solid-state foaming to investigate the relationship between the cell structure and mechanical properties. Constrained foaming was used and a wide range of cell structures with a constant porosity of ∼75% by tuning saturation pressure (8–24 MPa) was developed. Experiments varying the saturation pressure while holding other variables’ constant show that the mean cell size and the mean cell wall thickness decreased, while the cell density and the open porosity increased with increase of pressure. Tensile modulus of PLA foams decreased with increasing the saturation pressure, but the specific tensile modulus of PLA foams was still 15–80% higher than that of solid PLA. Tensile strength and elongation at break first increased with increasing saturation pressure up to 16 MPa and then decreased with further increasing saturation pressure (20 MPa and 24 MPa) at which opened-cell structure produced. Compressive modulus, compressive strength, and compressive yield stress also followed the same variation trend. The results indicated that not only cell size plays an important role in properties of PLA foams but also cell morphology can influence these properties significantly.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"40 1","pages":"101 - 118"},"PeriodicalIF":1.6,"publicationDate":"2020-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489320930328","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49474206","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: 11

Preparation and properties of melamine-formaldehyde rigid closed-cell foam toughened by ethylene glycol/carbon fiber 乙二醇/碳纤维增韧三聚氰胺甲醛刚性闭孔泡沫的制备及性能

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-06-04 DOI: 10.1177/0262489320929232

Chunhui Li, Haihong Ma, Zhengfa Zhou, Weibing Xu, F. Ren, Xinyu Yang

{"title":"Preparation and properties of melamine-formaldehyde rigid closed-cell foam toughened by ethylene glycol/carbon fiber","authors":"Chunhui Li, Haihong Ma, Zhengfa Zhou, Weibing Xu, F. Ren, Xinyu Yang","doi":"10.1177/0262489320929232","DOIUrl":"https://doi.org/10.1177/0262489320929232","url":null,"abstract":"Toughing melamine-formaldehyde (MF) rigid closed-cell foams were prepared by using ethylene glycol (EG) and carbon fiber (CF) as composite toughening agents. The pulverization rate, compressive strength, bending strength, cellular structure, closed-cell ratio, water absorption ratio, thermal conductivity, thermal stability, limiting oxygen index (LOI), and char yield were characterized to study the morphology, mechanical, thermal, and fire-retardant properties of as-prepared toughing MF rigid foams. The pulverization rate result showed that introduction of composite modifier can obviously improve the toughness of MF rigid foams. The cellular structure, closed-cell ratio, and water absorption results showed that the addition of EG/CF can increase the closed-cell ratio and control the cell size of MF rigid foams. The compressive strength and bending strength results showed that the incorporation of composite modifier of MF rigid foams dramatically improved the mechanical properties. The LOI, char yield, and thermal stability results showed that the toughing MF rigid foams remained more intact char skeleton with flame-retardant effect, thus reducing the fire hazards. The as-prepared toughing MF rigid foams showed the best comprehensive performance with pulverization rate of 5.21%, compressive strength of 355.3 kPa, bending strength of 0.44 MPa, closed-cell ratio of 79.1%, water absorption of 9%, thermal conductivity of 0.031 W m−1 K−1, and LOI of 39.6%. Compared with unmodified MF rigid foams, toughing rigid closed-cell MF foams possess excellent pulverization rate, compressive strength, bending strength, cellular structure, thermal insulation, and flame retardancy.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"40 1","pages":"55 - 72"},"PeriodicalIF":1.6,"publicationDate":"2020-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489320929232","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44801488","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: 6

Analysis of static sealing rules of foamed silicone rubber based on a porous media model 基于多孔介质模型的发泡硅橡胶静密封规律分析

IF 1.6 4区医学

Cellular Polymers Pub Date : 2020-05-01 DOI: 10.1177/0262489319890076

Tianzheng Wen, Fei Guo, Yijie Huang, S. Zhu, X. Jia

{"title":"Analysis of static sealing rules of foamed silicone rubber based on a porous media model","authors":"Tianzheng Wen, Fei Guo, Yijie Huang, S. Zhu, X. Jia","doi":"10.1177/0262489319890076","DOIUrl":"https://doi.org/10.1177/0262489319890076","url":null,"abstract":"We established a method for calculating and analyzing the static leakage rate based on a porous media model for foamed silicone rubber materials. The mechanical properties of the foamed silicone rubber material under macroscopic compression were described by the Ogden third (foam) model in the finite-element hyperelastic model. It solved the problem of difficult convergence of large compressible and volume compressible cell materials. The size and distribution of the cells on the surface of the foamed material were obtained by a white-light interferometer and mathematical fitting. The boundary conditions for solving the porous medium model were obtained by the coupling of the macroscopic contact pressure and the microscopic cell contact pressure. For the unique cell structure and contact state of the surface of the foamed material, the flow state of the fluid at the sealing interface was described by a porous medium model, and the leak rate was obtained. In addition, this article analyzed the effect of different compression and the relative pressure of the sealing end face on the leakage.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"39 1","pages":"101 - 116"},"PeriodicalIF":1.6,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489319890076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46359606","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