{"title":"Epoxidized natural rubber composites containing K0.15Cr0.02Ni0.83O nanoparticles: Curing characteristics, dynamic mechanical, mechanical, morphological, and dielectric properties","authors":"B. Khumpaitool, P. Jantachum, S. Utara","doi":"10.1177/00952443221144739","DOIUrl":"https://doi.org/10.1177/00952443221144739","url":null,"abstract":"Many researchers have been trying to improve rubber composites because they are commonly used in a wide range of applications. Incorporation of nano-fillers in a rubber matrix is the most acceptable way to improve the mechanical and electrical properties of rubber composites. A nanometer-sized filler, such as K0.15Cr0.02Ni0.83O (KCNO), has rarely been used to improve the properties of rubber composites. Epoxidized natural rubber (ENR) was chosen for blending with KCNO nanoparticles based on its polarity and chemical resistance. The aim of this work is to investigate the effects of filler loading (0.5, 1.5, and 5 phr) on the curing characteristics, dynamic mechanical, mechanical, morphological, and dielectric properties of rubber composites. From the results, rubber vulcanizates with 1.5 phr of KCNO as filler exhibit better tensile strength and 500% modulus compared to other ENR specimens containing KCNO. ENR containing 1.5 phr of KCNO also has a higher storage modulus (E′) and glass transition temperature (Tg). The results of a microstructural characterization on a sample containing 1.5 phr of KCNO show that the natural rubber matrix and KCNO are effectively dispersed, indicating that the rubber and KCNO are likely well-matched, therefore curing simultaneously and forming a continuous phase. Furthermore, ENR containing 1.5 phr of KCNO has a greater dielectric constant (12.87 at 5 kHz) than other samples.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"123 1","pages":"116 - 133"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76768331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fatigue life prediction and fracture mechanism of styrene-butadiene-styrene thermoplastic elastomer under uniaxial tension","authors":"Yuxin Liu, Rulong Wu, Liangyan Liao","doi":"10.1177/00952443221144743","DOIUrl":"https://doi.org/10.1177/00952443221144743","url":null,"abstract":"The fatigue life and prediction of styrene-butadiene-styrene thermoplastic elastomer (SBS) under the action of uniaxial tension was investigated, and the fatigue fracture mechanism was analyzed. With the increases of amplitude and frequency, the fatigue life of SBS decreases. The fatigue life of SBS under the amplitude and frequency was predicted, and the shift factor was applied to predict the fatigue life of SBS at the other frequency and amplitude. With the increase of temperature, the fatigue life decreases first and then increases. The fatigue fracture surface presents crack source region, crack propagation region, and instantaneous fracture region. At – 40°C, the crack source region is rough, and the crack propagation region and instantaneous fracture region are rough with the rib morphology. With the increase of temperature at 23°C, the crack source region is relatively flat, and the crack propagation region presents the undulant surface. With the temperature further increased up to 50°C, the fracture surface is very flat, and the shell lines could be clearly seen. The crack growth rate of SBS increases with the increase of temperature. The gel structure of SBS is formed at high temperature through the chemical crosslinking.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"88 1","pages":"99 - 115"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75914421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Massimo Ujčič, M. Levak, Nina Vranjes Penava, E. Govorčin Bajsić, V. Kosar
{"title":"Thermal degradation and thermal kinetic of SEBS block copolymer compatibilized PS/HDPE blends","authors":"Massimo Ujčič, M. Levak, Nina Vranjes Penava, E. Govorčin Bajsić, V. Kosar","doi":"10.1177/00952443221140473","DOIUrl":"https://doi.org/10.1177/00952443221140473","url":null,"abstract":"The effect of styrene-ethylene/butylene-styrene block copolymer (SEBS) on the thermal degradation of polystyrene (PS)/high density polyethylene (HDPE) blends have been investigated. Polystyrene and (HDPE) are widely used thermoplastics, which have extensive application in everyday life. The main disadvantage of PS/PE systems is their poor miscibility which can be improved by adding compatibilizer. The blends were prepared by melt mixing in a twin screw extruder Haake Record 90. The behavior of the thermal degradation of PS/HDPE and PS/HDPE/SEBS blends has been investigated in inert nitrogen atmosphere by using thermogravimetric analysis (TGA) to obtain the degradation temperature and activation energy (E a ). The Ea for the PS/HDPE blends as well as for the PS/HDPE/SEBS blends was determined by the isoconversional Kissinger–Akahira–Sunose (KAS) method. The results indicated that the HDPE enhance thermal properties of the blends. The addition of SEBS in PS/HDPE blends increased the E a in all blends.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"31 1","pages":"82 - 98"},"PeriodicalIF":0.0,"publicationDate":"2022-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73743774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Self-healable, strengthened, shape memory elastomers enabled by dual cross-linked networks","authors":"Lin Wang, Chenlu Wang, W. Sun, A. Du","doi":"10.1177/00952443221140466","DOIUrl":"https://doi.org/10.1177/00952443221140466","url":null,"abstract":"We propose a strategy of combining covalent and noncovalent cross-links into carboxyl nitrile rubber (XNBR) networks to fabricate multifunctional elastomers with self-healing and shape memory ability. Specially, commercially available XNBR was cross-linked by diethylenetriamine (DETA) and trimethylolpropane tris(3-mercaptopropionate) (TMPT) through hydrogen bond interaction and thiol-ene “click” reaction, generating reversible hydrogen bonds and robust covalent bonds cross-links, respectively. The modulus of the resulted polymers is consistently enhanced with the increase of TMPT loading, indicating the cross-linking networks are gradually constrained. In addition, the samples demonstrate self-healing and shape memory functions due to the reversible hydrogen bonds and robust covalent cross-links. When the content of TMPT is 0, the sample shows the high elongation at break and appropriate tensile strength. It can achieve almost complete healing due to the material contains noncovalent bonds only. When the content of TMPT is 2 phr, the sample exhibits both pretty self-healing and moderate shape memory ability. This strategy might provide an alternative way to construct intelligent multifunctional polymers with versatile functions.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"1 1","pages":"67 - 81"},"PeriodicalIF":0.0,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72953000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparative study of different bis-citraconimides as anti-reversion agents in natural rubber","authors":"Mingbin He, Lijing Zou, Zhaohui Chen, Ruoming Huang","doi":"10.1177/00952443221138914","DOIUrl":"https://doi.org/10.1177/00952443221138914","url":null,"abstract":"Sulfur-cured natural rubber (NR) commonly accompanies reversion, which severely impacts the properties as well as service life of NR products. Introducing anti-reversion agents is one of the most effective ways to counteract reversion. In this work, five structurally different bis-citraconimides have been synthesized and used as anti-reversion agents for sulfur-cured NR. In detail, the differences of anti-reversion agents in the cure characteristics, cross-linked structure, physical-mechanical properties, heat build-up, and dynamic mechanical properties of sulfur-cured NR are investigated in order to elaborate on the differences in reactivity and cross-linking chemistry of anti-reversion agents. The results show that N,N′-p-phenylene-biscitraconimide (BCmB) provides the best anti-reversion performance for compound cured at 150°C, with N,N′-p-phenylene-biscitraconimide (BCpB) following closely behind. Although Perkalink 900 (1,3-bis(citraconimidomethyl)benzene: BCDB), 1,3-bis(citraconimido)isobutane (BIB), and 1,6-bis(citraconimido)hexane (BCH) are less effective than BCmB and BCpB in improving the anti-reversion performance of compound cured for a short period of time or cured at 150°C, they show better anti-reversion performance of compound cured for a longer time or cured at higher vulcanization temperature.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"20 1","pages":"46 - 66"},"PeriodicalIF":0.0,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80949020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Poyraz, Y. Güner, T. Yardım, R. Yamanoğlu, A. Tozluoğlu, S. Durmuş, M. Şen
{"title":"Influence of micro crystalline cellulose on EPDM-based automotive sealing profile","authors":"B. Poyraz, Y. Güner, T. Yardım, R. Yamanoğlu, A. Tozluoğlu, S. Durmuş, M. Şen","doi":"10.1177/00952443221138915","DOIUrl":"https://doi.org/10.1177/00952443221138915","url":null,"abstract":"This study examined the effects of microcrystalline cellulose (MCC) used in EPDM elastomer composites in replace of EPDM. For that purpose, the MCC was added in amounts of 1.75; 3.5, and 5.25 phr to investigate the chemical, thermal, rheological, mechanical, morphological, and dielectric properties of EPDM elastomers. At the end of the study, the MCC enabled increased tensile strength, and elongation while causing lower thermal stability and Mooney scorch. The MCC also facilitated the vulcanization process by providing faster production while mixing homogeneously in the matrix. In addition, it decreased dielectric lossyness as well as increased the electric charge storage capacity. However, E-Cel2, containing 3, 5 phr MCC, was found to be more suitable for high-K applications, whereas E-Cel3 was more suitable for low-loss applications. In conclusion, MCC can be also recommended to automotive industries to provide more biocompatible and enhanced properties as a substitute for EPDM.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"8 1","pages":"28 - 45"},"PeriodicalIF":0.0,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81815020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Patil, Yogesh S. Gaikhe, J. Vasavada, S. Mishra
{"title":"Effect of hyperelastic pre-stretching on thickness distribution of pressure thermoformed products","authors":"J. Patil, Yogesh S. Gaikhe, J. Vasavada, S. Mishra","doi":"10.1177/00952443221137358","DOIUrl":"https://doi.org/10.1177/00952443221137358","url":null,"abstract":"Pressure thermoforming is one of the most used processes, but the thickness gradient in the formed parts limits its application. To control the product thickness distribution, pressure forming is assisted by a punch. However, due to punch contact with the sheet, the process is susceptible to surface defect, which is detrimental to the optical properties of the product. To produce optical parts with zero surface defects and controlled thickness distribution, a novel approach as a means for dimensional control by sheet pre-stretching is proposed and validated numerically. It was found that pre-stretching has a significant effect on the deformation behavior of the product.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"48 1","pages":"3 - 13"},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80306239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Mensah, Lucas NW Damoah, E. Nyankson, W. Amoabeng
{"title":"Effect of Shea butter as plasticizer on natural rubber-carbon black reinforced composites","authors":"B. Mensah, Lucas NW Damoah, E. Nyankson, W. Amoabeng","doi":"10.1177/00952443221130477","DOIUrl":"https://doi.org/10.1177/00952443221130477","url":null,"abstract":"This paper presents the effect of eco-friendly plasticizer, Shea butter oil (SBO) in rubber compounding involving Carbon black (CB)-filled Natural rubber (NR). The SBO based compounds (SBC) was systematically investigated and the results were compared with compositions prepared with Petroleum-based oil (PO). Although, some of the measured properties were comparable between SBC and POC, however, the SBC generally exhibited better properties compared to the POC. For example, the SBC coded NS5: (NR-50 parts per hundred parts of rubber (phr) CB-5phr SBO) and NS40 (NR-50 phr CB-40 phr SBO) obtained 7 and 17% greater than NT5 (NR-50 phr CB-5phr PO) and NT40 (NR-50 phr CB-40 phr PO), respectively, based on 300 and 100% modulus ratio (M300/M100). In terms of reinforcement measured by bound rubber content, BR (%), NS5 and NS40 recorded higher BR (%) of 9 and 48% than NT5 and NT40, respectively. The NS5 > NT5 by 12 and 7% in terms of crosslinking density and rebound resilience, respectively. Also, the NS5 > NT5 and NS40 > NT40 by 40 and 75%, respectively, in terms of fatigue life behavior. Such enhancement has been linked to successful distribution of the CB particles assisted by SBO within the matrix of NR. While the SBO is economical and has high potential to substitute the PO which is already suspected to be carcinogenic and environmentally unfriendly, SBO has exhibited good plasticizing effect for rubber compounding, especially as curing activators for recipe intended for manufacturing rubber articles.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"26 1","pages":"1238 - 1253"},"PeriodicalIF":0.0,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74424419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eder D Perito, N. B. Guerra, M. Giovanela, G. Machado, Janaina da Silva Crespo
{"title":"Chemical, thermal and mechanical evaluation of poly(vinyl chloride) plastisol with different plasticizers","authors":"Eder D Perito, N. B. Guerra, M. Giovanela, G. Machado, Janaina da Silva Crespo","doi":"10.1177/00952443221135001","DOIUrl":"https://doi.org/10.1177/00952443221135001","url":null,"abstract":"The most widely used plasticized polymer is poly(vinyl chloride) (PVC) due to its excellent plasticizer compatibility characteristics. Traditionally, PVC plasticizers belong to the phthalate family; however, they have harmful effects on human health and the environment. In this work, we evaluated the effect of six types of plasticizers (dioctyl phthalate, dioctyl adipate, Lestarflex (a polymeric polyester plasticizer), polycaprolactone, polyester polyol, and 1,2,3-propanetriol triacetate) on the properties of PVC plastisol used in manufacturing shoes and toys. The mechanical properties (hardness, tensile strength, tear strength, and elongation at break) were evaluated before and after accelerated aging tests (in an ultraviolet oven and at 50°C). A thermal study was also carried out using differential scanning calorimetry and thermogravimetric analysis, while possible structural changes during deformation were investigated using the small-angle X-ray scattering technique. In general, the results have shown that in the plasticization and stabilization of PVC, the plasticizer dioctyl phthalate can be replaced by dioctyl adipate or Lestarflex without relevant changes in the final properties of the material, even after accelerated aging.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"75 1","pages":"1277 - 1294"},"PeriodicalIF":0.0,"publicationDate":"2022-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80499137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Leather-like composite materials prepared from natural rubber and two leather wastes: Wet blue leather and finished leather","authors":"L. Raksaksri, V. Phunpeng","doi":"10.1177/00952443221130472","DOIUrl":"https://doi.org/10.1177/00952443221130472","url":null,"abstract":"In this study, leather-like composites were prepared from natural rubber (NR) and two different types of leather waste, namely wet blue leather (WBL) and finished leather (FL). Compounding was carried out on an internal mixer and two-roll mill, and curing was further conducted on a compression molding machine. The effects of leather type and content from 20 to 80 parts per hundred of rubber (phr) on cure characteristics, mechanical properties (hardness and tensile properties) and thermal stability of the as-prepared composites were investigated and compared with those of the unfilled NR compound. The curing rate and crosslink density of all composites were found to be lower than those of the unfilled NR. All WBL-filled NR composites exhibited higher tensile strength than the unfilled NR, while all FL-filled NR composites had lower values. Meanwhile, the hardness and modulus at 200% strain of all composites were increased with increasing leather waste contents compared to those of the unfilled NR. The composites containing low WBL loadings (20 and 40 phr) demonstrated higher elongation at break over the unfilled NR, while the other composites exhibited lower values. Besides, the thermal stability of all NR composites was deteriorated, but still largely retained.","PeriodicalId":15613,"journal":{"name":"Journal of Elastomers & Plastics","volume":"144 1","pages":"1254 - 1276"},"PeriodicalIF":0.0,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77840466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}