Journal of Elastomers and Plastics最新文献_第9页

Dynamically Vulcanized PP/EPDM Blends: Effect of Composition and Curing Agents 动态硫化PP/EPDM共混物:组成和固化剂的影响

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-07-13 DOI: 10.1177/0095244309100531

A. Nicolini, Tatiana Louise Avila de Campos Rocha, Marly Maldaner Jacobi

引用次数: 11

New Reclaiming Process of Thermoset Polyurethane Foam and Blending with Polyamide-12 and Thermoplastic Polyurethane 热固性聚氨酯泡沫再生及与聚酰胺-12和热塑性聚氨酯共混的新工艺

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-07-01 DOI: 10.1177/0095244309099413

L. Gonella, A. J. Zattera, M. Zeni, R.V.B. Oliveira, L. B. Canto

{"title":"New Reclaiming Process of Thermoset Polyurethane Foam and Blending with Polyamide-12 and Thermoplastic Polyurethane","authors":"L. Gonella, A. J. Zattera, M. Zeni, R.V.B. Oliveira, L. B. Canto","doi":"10.1177/0095244309099413","DOIUrl":"https://doi.org/10.1177/0095244309099413","url":null,"abstract":"A new method to reclaim thermoset polyurethane (PU) foam by thermo-mechanical degradation using a batch Drais mixer was investigated, and the performance of reclaimed PU in blends with polyamide-12 (PA-12) or thermoplastic polyurethane (TPU) was studied. The reclamation method used disrupts the crosslinked structure of PU, decreasing its degree of crosslinking, which was confirmed through the determination of gel content, and by DSC, TGA and FTIR analyses. Under severe reclaiming conditions, the reclaimed PU was found to retain about half of its initial gel content. The blends of original PU and reclaimed PU (PU-r) with PA-12 and with TPU were prepared using a twin-screw extruder and were characterized with respect to their mechanical properties. For the PA-12/PU 75/25 blend, the addition of PU was observed to toughen the PA-12 matrix whereas for TPU/PU blends, the rubber-like behavior of TPU was not significantly affected by the presence of PU. The remarkable mechanical behavior of the blends attests to the high compatibility of PU-r with both PA-12 and TPU. This may be due to the physical interactions between the blend components, leading to high interfacial adhesion. The reclamation of PU-r before its melt processing with PA-12 or TPU was found to improve the processability during the injection molding of the PA-12/PU-r and TPU/PU-r blends.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"72 1","pages":"303 - 322"},"PeriodicalIF":1.7,"publicationDate":"2009-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84321264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Morphology Development and Melt Linear Viscoelastic Properties of (PA6/PP/PS) Ternary Blend Systems (PA6/PP/PS)三元共混体系的形态发展及熔体线粘弹性性能

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-07-01 DOI: 10.1177/0095244309104461

Hadi Mohammadigoushki, H. Nazockdast, N. Mostofi

{"title":"Morphology Development and Melt Linear Viscoelastic Properties of (PA6/PP/PS) Ternary Blend Systems","authors":"Hadi Mohammadigoushki, H. Nazockdast, N. Mostofi","doi":"10.1177/0095244309104461","DOIUrl":"https://doi.org/10.1177/0095244309104461","url":null,"abstract":"The morphology development and melt linear viscoelastic properties of PA6/PP/PS (70/15/15) ternary blends were studied. An attempt was also made to predict the morphology development of these blends using the dynamic interfacial tension of the blend components evaluated from the Palierne's viscoelastic model in conjunction with spreading coefficient approach. The blend samples were prepared by melt blending in an internal mixer at temperature of 260°C and rotor speed of 60 rpm. The ternary blend samples exhibited a pronounced low-frequency nonterminal storage modulus whose values were much greater than those predicted for elastic response of the binary blend samples. This was attributed to strong elastic resistance of a core-shell composite droplet formed in the ternary blend samples that was evidenced by the SEM micrographs of these samples. The results predicted based on spreading coefficient concept also suggested a core-shell type morphology in which PP core was encapsulated by PS shell as a composite minor phase dispersed in PA6 matrix. It was demonstrated that there is a close relationship between melt viscoelastic properties and morphology of ternary blends.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"28 7-8","pages":"339 - 351"},"PeriodicalIF":1.7,"publicationDate":"2009-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0095244309104461","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72455101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Natural Weathering of Poly (Lactic Acid): Effects of Rice Starch and Epoxidized Natural Rubber 聚乳酸的自然耐候性:大米淀粉和环氧化天然橡胶的影响

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-07-01 DOI: 10.1177/0095244309103663

G. H. Yew, W. Chow, Z. M. Mohd Ishak, A.M. Mohd Yusof

{"title":"Natural Weathering of Poly (Lactic Acid): Effects of Rice Starch and Epoxidized Natural Rubber","authors":"G. H. Yew, W. Chow, Z. M. Mohd Ishak, A.M. Mohd Yusof","doi":"10.1177/0095244309103663","DOIUrl":"https://doi.org/10.1177/0095244309103663","url":null,"abstract":"Poly(lactic acid) (PLA) composites consisting of PLA, rice starch (RS), and epoxidized natural rubber (ENR50) are compounded using a twinscrew extruder followed by compression molding. Two types of thermoplastic starch are prepared by mixing RS with glycerol and water. Natural weathering tests are performed on the PLA/RS composites in Penang, Malaysia for 2 months. The average mean temperature and mean relative humidity are 29°C and 70%, respectively. Tensile tests are performed to characterize the mechanical properties of the weathered PLA/RS composites. Morphological studies are performed by using scanning electron microscopy (SEM). The tensile properties of weathered PLA/RS composites decreased slightly, on the other hand, the tensile properties of weathered PLA/SG and PLA/SGW composites decreased drastically. The retention-ability of the PLA composites are relatively low, which may be attributed to the photo-degradation of PLA, chain scission of PLA, oxidation degradation on ENR, moisture absorption of RS, and leaching of RS particles. In addition, discoloration, surface roughness, surface cracking, and embrittlement are observed for all PLA/RS composites. The extent of degradation is increased by the addition of ENR, owing to the fact that ENR is susceptible to oxygen attack, and consequently facilitates degradation. The morphological properties of the weathered PLA/RS composites are transformed to a more brittle behavior, indicating that severe degradation has occurred on the PLA/RS composites.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"49 1","pages":"369 - 382"},"PeriodicalIF":1.7,"publicationDate":"2009-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84155566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 32

Networked Silica with Exceptional Reinforcing Performance for SBR Compounds: Interconnected by Methylene Diphenyl Diisocyanate 对SBR化合物具有特殊增强性能的网络化二氧化硅:由二苯基二异氰酸酯亚甲基连接

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-06-26 DOI: 10.1177/0095244309103662

Dong Shin Jeong, Chang Kook Hong, Gyun Taek Lim, G. Seo, Chang Seok Ryu

{"title":"Networked Silica with Exceptional Reinforcing Performance for SBR Compounds: Interconnected by Methylene Diphenyl Diisocyanate","authors":"Dong Shin Jeong, Chang Kook Hong, Gyun Taek Lim, G. Seo, Chang Seok Ryu","doi":"10.1177/0095244309103662","DOIUrl":"https://doi.org/10.1177/0095244309103662","url":null,"abstract":"A networked silica (NS) prepared by interconnecting silica particles with polymeric methylene diphenyl diisocyanate (MDI) was developed for use as a highly effective reinforcing material for rubber compounds without the need to add silane coupling agents. MDI incorporated onto the silica surface formed networks among neighboring silica particles with urethane linkages and produced NS at low cost. The TEM photographs illustrated the improved dispersion and formation of openings among the silica particles, which could allow easy intrusion of rubber molecules. The NS showed a high reinforcing performance for styrene—butadiene rubber (SBR) compounds, suggesting the possibility of replacing the silica reinforcing systems with coupling agents. Due to the absence of any silane-containing coupling agents, the NS does not suffer the disadvantages associated with coupling agents. Since the NS reinforces rubber compounds by the physical entanglement between rubber molecules and the MDI chains, high loading of the NS is more effective in enhancing the mechanical properties of rubber compounds.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"8 1","pages":"353 - 368"},"PeriodicalIF":1.7,"publicationDate":"2009-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82087129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Thermal, Chemical, and Morphological Characterization of Microcellular Polyurethane Elastomers 微孔聚氨酯弹性体的热、化学和形态表征

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-06-26 DOI: 10.1177/0095244309095016

Marcos F. M. Pacheco, O. Bianchi, R. Fiorio, A. J. Zattera, M. Zeni, M. Giovanela, J. S. Crespo

{"title":"Thermal, Chemical, and Morphological Characterization of Microcellular Polyurethane Elastomers","authors":"Marcos F. M. Pacheco, O. Bianchi, R. Fiorio, A. J. Zattera, M. Zeni, M. Giovanela, J. S. Crespo","doi":"10.1177/0095244309095016","DOIUrl":"https://doi.org/10.1177/0095244309095016","url":null,"abstract":"In this study, three different microcellular polyurethane elastomers (MPUE) based on 4,4'-diphenylmethane diisocyanate with different rigid segment contents are prepared (Formulations 1, 2, and 3 with 32, 35, and 42% of rigid segment content, respectively). The MPUE are obtained through a two-step method using a prepolymer system. The samples are analyzed to determine their thermal, morphological, and chemical properties. The thermogravimetric analysis indicates the presence of two degradation stages, referring to the rigid and flexible phases, respectively. The differential scanning calorimetry tests indicate that for the MPUE there was an increase in the glass transition temperature of the flexible phase with an increase in the percent of the rigid phase. An increase in the quantity of the rigid phase present in the MPUE results in greater values for the crosslink density, which in turn results in an increase in the rigidity of the material. The scanning electron microscopy micrographs indicated a large number of closed cells and that a higher rigid segment content give a better cell homogeneity of the samples.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"81 1","pages":"323 - 338"},"PeriodicalIF":1.7,"publicationDate":"2009-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76098941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Effect of Moisture-induced Damage on Fracture Resistance of Rubber-modified HMA Mixtures 湿损伤对橡胶改性HMA混合料抗断裂性能的影响

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-06-03 DOI: 10.1177/0095244309104462

A. Othman

引用次数: 3

Mechanical Testing and Characterization of a Swelling Elastomer 膨胀弹性体的力学测试和特性

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-06-03 DOI: 10.1177/0095244309105248

S. Qamar, S. Al-Hiddabi, T. Pervez, F. Marketz

{"title":"Mechanical Testing and Characterization of a Swelling Elastomer","authors":"S. Qamar, S. Al-Hiddabi, T. Pervez, F. Marketz","doi":"10.1177/0095244309105248","DOIUrl":"https://doi.org/10.1177/0095244309105248","url":null,"abstract":"Elastomers are being increasingly used for sealing and other applications in the oil and gas industry. Specifically developed elastomers possess durable properties and have the ability to withstand detrimental effects of heat, chemicals, and harsh environments. For successful modeling and simulation of various downhole processes, it is very important to determine the behavior of elastomer materials under realistic well conditions. Of special interest is the class known as swelling elastomers. This article reports some results from experiments conducted on mechanical testing and characterization of an inert (nonswelling) and a water-swelling elastomer (both belonging to the EPDM family) used for sealing purposes by a local petroleum development firm. Experiments were designed and conducted in accordance with standard ASTM test methods. Apart from regularly available testing equipment, some simple test rigs and fixtures were designed and fabricated. Elastomer behavior was tested for hardness, compression set (at different temperatures and for different periods of time), tensile set (for different periods of time), tensile properties (fracture strength and percent elongation), and swelling. In the swelling test, different sample geometries (unconfined samples and samples mounted on steel plate) were tested for a total duration of 1000 h (roughly 45 days) in salt solutions of different concentrations and at different temperatures. Results show that compression set increases with increasing temperature and testing time, while room temperature tensile set also increases with longer testing time. Compared to the inert elastomer (exhibiting nonlinear elastic behavior like normal rubbers), swelling elastomer surprisingly showed linear stress—strain response. As expected, the inert elastomer did not exhibit any change in volume, while the swelling elastomer showed significant volume/thickness increase with increasing test temperature and decreasing salt concentration.","PeriodicalId":15644,"journal":{"name":"Journal of Elastomers and Plastics","volume":"38 1","pages":"415 - 431"},"PeriodicalIF":1.7,"publicationDate":"2009-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82140266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 38

Effect of Complex Curatives on the Properties for Ethylene Propylene Diene Rubber/Polypropylene Blends 复合硫化剂对乙丙橡胶/聚丙烯共混物性能的影响

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-05-01 DOI: 10.1177/0095244308091524

Y. Tsai, P. Tsai, Yao-Tsu Wu, M. Leu, Jyh-Horng Wu

引用次数: 7

Rheology of PVC Plastisol at Instability Region and Beyond (Proposal for Super-High Shear-Rate Coating) PVC塑溶胶在不稳定区及以外的流变性(超高剪切率涂料的建议)

IF 1.7 4区材料科学

Journal of Elastomers and Plastics Pub Date : 2009-05-01 DOI: 10.1177/0095244308099553

N. Nakajima, E. R. Harrell

引用次数: 4