ITAST (Iranian Textile Association of Science and Technology)Journal of Textiles and Polymers2322-520312120250219Effects of Zinc Stearate Replacement and Zinc Oxide/Zinc Stearate Ratio on Rheological Properties and Curing Characteristics of Carbon Black-Filled Rubbersاثرات جایگزینی استئارات روی و نسبت اکسید روی/استئارات روی بر خواص رئولوژیکی و پخت لاستیک های پر شده با دوده21220310.48302/jtp.2024.451169.1286ENMohammadFasihiIran University of Science and TechnologyJournal Article20240405This work aims to study the substitution of zinc stearate (ZS) as an activator and coactivator with stearic acid (SA), its mechanism of action and also the influence of ZnO/ZS on the rheological and curing characteristics of styrene-butadiene (SBR), butadiene (BR) and nitrile-butadiene (NBR) rubbers-filled carbon black. Despite accelerating the curing reaction rate of SBR, BR and NBR by ~119, 145 and 22%, the ZS chemical increased the maximum torque in the oscillating disc rheometer (ODR) by 13 and 17% for BR and NBR, respectively, with a slight change for SBR. The minimum torque in the ODR test also increased by ~25 and 11% for BR and NBR in the presence of ZS, while SBR experienced a ~8% reduction. The decrease in the ZnO/ZS ratio changed the rheological behavior of SBR to an insignificant overcuring reversion in the maturing zone. The curing time of SBR was decreased from 15.09 to 11.31 min by reducing the ZnO/ZS amount from 2/1 to 1/1, while the scorch time was almost similar in the BR and NBR-based compounds. Reducing the ZnO/ZS amount raised the maximum vulcanization rate of SBR by ~50% (0.687 to 1.03 1/min), while its trend was descending in the BR and NBR compounds by ~53% and 20%. Moreover, the decrease of ZnO in the recipe containing the ZS chemical decreased the crosslinking by ∼16% (from 8.065 to 6.768×105 mol/g) and 4% (from 0.278 to 0.268×105 mol/g) for the BR and NBR compounds, while it did not vary the SBR crosslink density.این پژوهش به بررسی جایگزینی استئارات روی (ZS) به عنوان فعالکننده و همفعالکننده با اسید استئاریک (SA)، و تأثیر ZnO/ZS بر ویژگیهای رئولوژیکی و پخت لاستیکهای استایرن-بوتادین (SBR)، بوتادین (BR) و نیتریل-بوتادین (NBR) پرشده با دوده میپردازد. با وجود اینکه ZS سرعت واکنش پخت SBR، BR و NBR را به ترتیب به میزان ~119، 145 و 22 درصد افزایش داد، افزایش ZS حداکثر گشتاور را در رئومتر نوسانی (ODR) به ترتیب 13 و 17 درصد برای BR و NBR افزایش داد، در حالی که تغییر کمی برای SBR مشاهده شد. حداقل گشتاور در آزمون ODR نیز به ترتیب ~25 و 11 درصد برای BR و NBR در حضور ZS افزایش یافت، در حالی که SBR کاهش 8 درصدی را تجربه کرد. کاهش نسبت ZnO/ZS رفتار رئولوژیکی SBR را به یک بازگشت بعد از پخت تغییر داد. زمان پخت SBR از 15.09 به 11.31 دقیقه با کاهش مقدار ZnO/ZS از 2/1 به 1/1 کاهش یافت، در حالی که زمان اسکورچ تقریباً مشابهی در ترکیبات مبتنی بر BR و NBR مشاهده شد. کاهش مقدار ZnO/ZS حداکثر نرخ ولکانیزاسیون SBR را به میزان ~50 درصد (از 0.687 به 1.03 1/min) افزایش داد، در حالی که روند آن در ترکیبات BR و NBR به ترتیب ~53 و 20 درصد کاهش یافت. علاوه بر این، کاهش ZnO در فرمولاسیون حاوی ZS شیمیایی، پیوندزنی را به میزان ∼16 درصد (از 8.065 به 6.768×105 مول/گرم) و 4 درصد (از 0.278 به 0.268×105 مول/گرم) برای BR و NBR کاهش داد، در حالی که چگالی پیوندزنی SBR تغییر نکرد.http://www.itast.ir/article_212203_dcb900591e4ef89e70a73c6e1992d225.pdfITAST (Iranian Textile Association of Science and Technology)Journal of Textiles and Polymers2322-520312120250219Fabrication and characterization of PCL nanofibrous networks containing ZnO and Ag for enhanced antibacterial properties22500310.48302/jtp.2025.498495.1304ENElhamNaghashzargarUniversity of BonabMarziyehRanjbar Mohammadiuniversity of BonabJournal Article20250108This study investigates the manufacturing and characterization of nanofibrous networks consisting of poly(ε-caprolactone) (PCL) and its nanocomposites, incorporating ZnO and Ag nanoparticles and their effectiveness in antibacterial properties. The focus is the fabrication of PCL-ZnO (ZnO:1 wt.%) and PCL-ZnO-Ag (ZnO: 1 wt.% and Ag: 0.5 wt.%) structures using the electrospinning technique. Scanning electron microscopy (SEM) showed the successful formation of beadless and smooth nanofibers for all three samples, with average nanofiber diameters of approximately 409.17 ± 106.99 nm for PCL, 226.65 ± 76.34 nm for PCL-ZnO, and 167.97 ± 24.26 nm for PCL-ZnO-Ag. However, incorporating ZnO and Ag nanoparticles led to a reduction in nanofiber diameter. Energy Dispersive X-ray (EDX) analysis confirmed the presence of ZnO and Ag nanoparticles in PCL-ZnO-Ag nanofibrous webs. The water contact angle increased with ZnO incorporation, showing hydrophobic behavior, while Ag addition increased surface hydrophilicity in comparison with PCL-ZnO sample. Antibacterial activity tests exhibited the capability of PCL-ZnO and PCL-ZnO-Ag structures against both Gram-negative (E. coli) and Gram-positive (S. aureus) bacteria. The combined effects of ZnO and Ag nanoparticles in PCL-ZnO-Ag resulted in broader antibacterial activity, promising significant potential for wound dressing applications.http://www.itast.ir/article_225003_328e9981956b928cab28887ee6f0e6b1.pdfITAST (Iranian Textile Association of Science and Technology)Journal of Textiles and Polymers2322-520312120250219Introducing a Method for Evaluating Fabric Performance against Human Body Thermal Radiationمعرفی روشی برای ارزیابی عملکرد پارچه در برابر تابش گرمایی بدن انسان23012810.48302/jtp.2025.524673.1313ENElhamTavakkolDepartment of Textile Engineering, Isfahan University of Technology, Isfahan, Iran0000-0003-1612-7762AbolghasemZeidaabadi NezhadDepartment of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran.SedighehBorhaniDepartment of Textile Engineering, Isfahan University of Technology, Isfahan, Iran.Journal Article20250527More than half of the body's metabolic heat is dissipated to the environment as infrared radiation. Consequently, the design and development of textiles that modulate infrared radiation to provide localized heating or cooling have recently gained significant attention for enhancing thermal comfort. However, evaluating the performance of such textiles often requires specialized and costly methods. This study introduces a novel approach for assessing the optical properties of fabrics in the infrared region by utilizing Fourier-transform infrared (FTIR) spectroscopy data and calculating key scattering parameters. The calculated spectra demonstrated that fabric samples incorporating 1% and 2% aluminum (designated PA1 and PA2) reflect more than 40% of human body radiation near the skin, thereby effectively inhibiting radiative heat loss to the environment. The significant apparent temperature difference observed for these samples confirmed their potential as effective radiative heating textiles. The findings indicate that the proposed method offers a viable and accessible alternative for the relative evaluation and comparison of textile thermal radiation properties, especially in settings where advanced instrumentation like an integrating sphere is unavailable.بیش از 50 درصد گرمای تولیدشده توسط بدن انسان از طریق تابش فروسرخ با محیط تبادل میشود. با توجه به اهمیت آسایش گرمایی انسان، تولید و توسعه منسوجاتی که گرم یا خنک کردن موضعی بدن را از طریق کنترل تابش فروسرخ انجام میدهند، مورد توجه پژوهشگران قرار گرفته است. ارزیابی عملکرد چنین منسوجاتی اغلب منحصربهفرد و گرانقیمت است. در این پژوهش روشی برای ارزیابی عملکرد پارچه در برابر تابش گرمایی بدن از طریق بررسی خواص نوری پارچه در ناحیه فروسرخ با استفاده از دادههای طیفسنجی FTIR و محاسبه پارامترهای پراکندگی، ارائه شده است. طیفهای محاسبه شده نشان داد نمونههای پارچه های حاوی 1 و 2 درصد آلومینیم بیش از 40 درصد تابش گرمایی بدن انسان را در مجاورت پوست بازتاب کرده و از انتقال تابش به محیط جلوگیری میکنند. اختلاف دمای ظاهری ایجاد شده توسط این دو نمونه، وجود عملکرد گرمکنندگی را تایید کرد.http://www.itast.ir/article_230128_17e11807eb2cf76bef2f4ce14cd99f8c.pdfITAST (Iranian Textile Association of Science and Technology)Journal of Textiles and Polymers2322-520312120250219Role of Geogrid’s Structure on the California Bearing Ratio of the Reinforced Soil23186910.48302/jtp.2025.542898.1319ENAzitaAsayeshDepartment of Textile Engineering, Amirkabir University of Technology (Tehran Polytechnic), Iran0000-0003-1757-7984MortezaShahmohammadiTextile Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, IranS. MajdeddinMir Mohammad HosseiniCivil and Environmental Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.Journal Article20250823The use of geosynthetic materials is a well-established and effective approach for reinforcing soil and improving its bearing capacity in geotechnical applications. Among these materials, geogrids have gained particular importance due to their ability to interlock with soil particles and enhance load distribution. In the present study, the effect of geogrid’s structure on the California Bearing Ratio (CBR) of the reinforced soil has been investigated. For this purpose, warp-knitted polyester geogrids with various structures (Chain stitch + inlay, Tricot + inlay longitudinal ribs connected by inlay/weft yarns) were produced, coated, and tested for tensile strength and CBR. Results showed that geogrid reinforcement enhances soil CBR up to 20%, with a linear relationship between CBR and the ratio of geogrid elastic moduli in orthogonal directions. The geogrid structure significantly affected CBR, with Chain stitch/weft yarn configurations demonstrating superior reinforcement due to higher tensile strength and elastic modulus in both directions. The findings emphasize the significance of geogrid structure in enhancing soil reinforcement.http://www.itast.ir/article_231869_0ce773e767a7d54da400ac07eacb32ca.pdfITAST (Iranian Textile Association of Science and Technology)Journal of Textiles and Polymers2322-520312120250219Investigation of The effect of E-glass/carbon hybridization on the buckling behavior of woven fabric reinforced composite laminates23329410.48302/jtp.2025.544748.1321ENZinatsadatMazloomiTextile Engineering Department, Amirkabir University
of Technology (Tehran Polytechnic), Tehran, Iran0000-0002-7973-9793HadiDabiryanTextile Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Ira0000-0001-5161-2849Journal Article20250902Hybridization is a technique to enhance the mechanical properties of composites. This paper aims to investigate the effect of hybridization on the buckling behavior of fabric-reinforced composites experimentally, numerically, and theoretically. For this purpose, uniform and hybrid laminates were produced using glass and carbon woven fabrics and epoxy resin. The buckling test were carried out on the prepared samples. The results showed that the hybridization technique enhance the critical buckling loads of laminates. Also, the location of laminas in hybrid laminates significantly affects the buckling behavior of laminates so that the maximum critical buckling load (538.9 kN) belongs to the laminate where the carbon-fabric-reinforced laminas are in outer layers, and the minimum (201.3 kN) belongs to the sample whose outer layers are glass-fabric-reinforced laminas. In addition, a very good correlation was observed between theoretical and numerical results of buckling simulation, which predicted the critical buckling load in FEM based software (ABAQUS).http://www.itast.ir/article_233294_79e0c0373ccd426f19b48b3ab4b1de8a.pdfITAST (Iranian Textile Association of Science and Technology)Journal of Textiles and Polymers2322-520312120250219Effects of Fibrous Layer Structure on Tensile Behavior and Fracture Toughness of E-Glass/Epoxy Composites: A Comparison Between Angle Plied and Woven Layers23429110.48302/jtp.2025.528342.1315ENAzamAlirezazadehDepartment of Textile Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran0000-0003-2679-1149Seyed MehdiHejaziDepartment of Textile Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran0000-0003-1656-3505AliZadhoushDepartment of Textile Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran0000-0003-1854-3129SalehAkbarzadehDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran0000-0003-0284-3354Journal Article20250604The fibrous layer structure plays a pivotal role in determining the mechanical performance of fiber reinforced polymer composites (FRPCs). Studying the influence of fibrous layer structure on fracture behavior of FRPCs, as one of the key mechanical characteristics, is crucial to improve safety and complex load bearing capacity of advanced structures. Therefore, the main objective of this research is to compare the tensile behavior and crack growth in two types of E-glass/epoxy composites and to examine how the structure of fibrous layers influences the mechanical properties of the composite. Samples were produced in a four-layer configuration using vacuum infusion process (VIP). The first sample consisted of four layers of woven fabric arranged at ±45o, while the second sample was made from four angle plied layers with a fiber orientation of ±45o. Before conducting tensile and fracture tests, microbond tests were performed to explore any possible differences between the fiber/matrix interfacial properties within the two composite samples. Physical characteristics including thickness, density, fiber volume fraction and void content in the two composite samples were also evaluated. Then, the composite samples were subjected to tensile tests. To investigate mode I fracture toughness, the samples were single-edge notched and then subjected to tensile tests. Results indicated that the composite reinforced with woven layers exhibited high tensile strength and stiffness but was more sensitive to crack growth. The composite with angle plied layers, despite being thicker, showed 28.47% higher stress intensity factor and 56.63% higher critical energy release rate, compared with the woven counterpart.http://www.itast.ir/article_234291_81f73cbd2d93eab2f452a5c309b6b34f.pdf