Crystallization Peak Research Articles

Nonisothermal crystallization behavior of micron-sized Mg85Ni5Y10 amorphous wires

In this work, a micron-sized Mg85Ni5Y10 amorphous alloy was successfully prepared by using melt-spinning technology, and the thermodynamic stability and nonisothermal crystallization kinetics were studied in detail. The activation energies Eg, Ex, and Ep corresponding to the glass transition temperature (Tg), onset crystallization temperature (Tx), and peak crystallization temperature (Tp), respectively, were calculated by using the Kissinger and Ozawa equations, among which the value of Eg was determined to be the highest, indicating that atom rearrangement has difficulty overcoming the interaction force between Ni and Y atoms in view of the low mixing enthalpy. Additionally, in situ XRD was used to analyze the phase transformation during crystallization, showing that phase separation occurs prior to the precipitation of the Mg2Ni nanocrystalline phase, which is followed by the appearance of Ni3Y and Ni2Y3. The first and second crystallization processes involve diffusion-controlled growth with different nucleation rates, while in the final stage, the crystal continues to grow without obvious nucleation. The results may shed some light on interpreting the crystallization mechanisms of amorphous Mg-Ni-Y and even other Mg-Ni-RE alloy.

Research on mixed alkaline-earth effect in non-alkali glass substrates for TFT-LCDs

Herein, we used CaO to replace MgO to investigate the effect of mixed alkaline-earth effect on structure and properties of the non-alkali glass substrates which were synthesized by the traditional melting technology. The results show that with the replacement of CaO for MgO, the stability of the glass network structure decreases due to the decrease of the bridging oxygens. In terms of the comprehensive properties, the glass density, molar volume, thermal expansion coefficient, strain and softening points, and chemical stability all show a near-linear increase or decrease. However, due to the mixed alkaline-earth effect, some other properties including the crystallization peak temperature, thermal stability, and mechanical properties show a negative deviation from linearity, and the extremum locates at the CaO content of 6 mol%. Based on the results, this research can provide a significant guidance for the property control of non-alkali glass substrates.

Na-TiNT Nanocrystals: Synthesis, Characterization, and Antibacterial Properties.

Titanium nanotubes have attractive morphological and physicochemical properties for several applications, such as high surface area, mesoporous structure, good stability, ion exchange capacity, and antibacterial property. Therefore, the field of nanotube applications is increasingly expanding, such as in solar cells sensitized by dye, photocatalysis, and antibacterial activity, among others. Therefore, a study of the antibacterial properties of sodium titanate nanotubes (Na-TiNTs) was carried out together with physicochemical characterizations, such as Raman spectroscopy which shows a peak characteristic of Na-O-Ti from nanotube-agglomerated regions. The XRD diffractogram confirmed the Raman spectra and evidenced the crystalline structure associated to Na-TiNT, which showed the characteristic peaks of the sodium trititanate crystal. SEM and TEM images showed the morphology of hollow nanotubes and forming semispherical particles. EDS shows the percentage values of each of the compounds in the Na-TiNT. The bacterial activity of the Na-TiNT was analyzed in Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. Na-TiNT modified the activity of the gentamicin and norfloxacin antibiotics against multiresistant strains. Synergistic effects against Gram-positive S. aureus 10 and Gram-negative P. aeruginosa 15 bacteria were observed when the Na-TiNT was associated with gentamicin, reducing the concentration of this antibiotic that is required to inhibit bacterial growth. Another synergic effect was observed for S. aureus 10 with norfloxacin.

Crystal-field induced tuning of luminescence properties of Na3GaxAl1-xF6:Cr3+ phosphors with good thermal stability for NIR LEDs.

Cr3+-Activated broadband near-infrared (NIR) luminescence materials are attracting much attention as next-generation smart NIR light sources that are widely used in night vision, bioimaging, medical treatment, and many other fields. Herein, a series of Na3GaxAl1-xF6:Cr3+ NIR phosphors with broadband emission and tunable luminescence properties were designed and prepared. The luminescence intensity, peak position and full width at half maximum (FWHM) of the materials can be controlled by adjusting the crystal field strength. Furthermore, Na3Ga0.75Al0.25F6:0.35Cr3+ exhibited high luminous efficiency and the emission intensity remained 81% at 423 K compared with the initial value at 298 K. The structural confinement and the electron-phonon coupling (EPC) effect may account for its good thermal stability. Finally, a pc-NIR-LED device with a photoelectric conversion efficiency of 6.53% at 350 mA was fabricated by combining the as-prepared NIR phosphor and a blue InGaN chip, and its applications in night vision and medical fields were further investigated. This work will promote the development of NIR phosphors with tunable luminescence properties.

Preparation of exfoliated graphite nanoplates/thermoplastic polyurethane composites with enhanced dielectric properties

In this work, exfoliated graphite nanoplates (xGNPs)/thermoplastic polyurethane (TPU) composites with enhanced dielectric constant and relatively low dielectric loss factor were prepared by an effective method involving solution blending and water precipitating. The wide-angle X-ray diffraction results proved that the xGNPs had been added into the TPU. Furthermore, the microstructure of the resultant xGNPs (2 wt.%)/TPU composite was investigated by scanning electron microscopy (SEM). The SEM images showed that there were many xGNPs in the TPU elastomer matrix. According to differential scanning calorimetry the melting peak temperature and the crystallization peak temperature of the xGNPs/TPU composites were lower than those of the pure TPU but the melting enthalpy and the crystallization enthalpy of the xGNPs/TPU composites were higher than those of the pure TPU. More importantly, the dielectric constant at 1000 Hz and the thermal conductivity of the xGNPs/TPU composites obviously increased in comparison with those of the pure TPU, especially when the xGNPs content was 2 wt.%.

40 - Toughening Via Revitrification of Li2SiO3 Crystals in Obsidian

The aim of this study was to illustrate the microstructural and compositional evolution of a lithium silicate glass-ceramic and to draw conclusions about its mechanical behaviour. Blocks of Obsidian (Glidewell Laboratories, USA) were processed into slices measuring 12x12x1.5mm3 for special heat treatment. The heating ramp was interrupted at temperatures between 700 C and 820 C (dwell time at 820 C between 0 min and 10 min) in order to freeze the respective microstructural state. The crystallization peaks of the base and the pre-crystallized glass were detected by DSC. The coefficient of thermal expansion and Tg were derived from DTA. XRD was performed to quantify and characterize the crystal phase fraction, whose microstructural changes were visualised using FE-SEM. The ball on three balls surface crack in flexure method was used to record the development of fracture toughness. The microstructural evolution during crystallization firing revealed the progressive revitrification of the original Li 2 SiO 3 crystals at the boundaries of nanometric single coherent scattering domains (CSD) starting at 740 C and extending throughout the isothermal stage. The crystal fraction decreased monotonically from 41vol.% of 5 m-sized poly-crystals to 35vol.% 0.5m-sized single-crystals, in opposite trend to the CSD sizes. The KIc accompanied the reverse trend of crystallinity, departing from 1.63±0.02 MPa ↔ m at the pre-crystallized stage to 1.84±0.06 MPa↔m after 10 min at 820 C in a sigmoidal shape. Toughening appeared counter-intuitive in view of the decreasing crystal fraction and size, to rather relate to the relaxation of the residual stresses in the interstitial glass, as let suggest from the disappearance of the extensive microcracking. During heat-treatment, the CTE decreased from 13.7×10-6 K-1 to 12.8×10-6 K-1. Toughening of Obsidian occurs via revitrification and isotropization of Li 2 SiO 3 crystals and consequent relaxation of anisotropic mismatch in coefficient of thermal expansion between crystal and glass, despite decrease in crystallinity and crystal size.

Crystallization of Isotactic Polypropylene Nanocomposites with Fibrillated Poly(tetrafluoroethylene) under Elevated Pressure.

Nanocomposites of isotactic polypropylene with 1–5 wt.% of fibrillated PTFE (PP/T) were prepared, and their crystallization during cooling under elevated pressure, in a wide pressure range, up to 300 MPa, as well as the resulting structure, were examined. The crystallization peak temperatures of PP/T, especially with 3 and 5 wt.% of PTFE, exceeded by up to 13 °C those of neat PP. Moreover, a fine-grain structure was formed in PP/T in the entire pressure range, which proved the ability of the fibrillated PTFE to nucleate crystallization of PP in the γ-form under elevated pressure. This also resulted in a higher crystallinity level developed in the γ-domain, before the temperature range of the α-domain was reached during cooling. Hence, the γ-content increased in comparison to that in neat PP, under the pressure up to 200 MPa, especially under 50–100 MPa.

The Synthesis of Biodegradable Poly(L-Lactic Acid)-Polyethylene Glycols Copolymer/Montmorillonite Nanocomposites and Analysis of the Crystallization Properties

This study makes use of polycondensation to produce poly (L-lactic acid)-(polyethylene glycols), a biodegradable copolymer, then puts it with organically modified montmorillonite (o-MMT) going through an intercalation process to produce a series of nanocomposites of PLLA-PEG/o-MMT. The exfoliation and intercalation of the montmorillonite-layered structure could be found through X-ray diffraction and transmission electron microscopy. The lower the molecular weight of poly (ethylene glycol), the more obvious the exfoliation and dispersion. The nanocomposites were investigated under non-isothermal crystallization and isothermal crystallization separately via differential scanning calorimetry (DSC). After the adding of o-MMT to PLLA-PEG copolymers, it was found that the PLLA-PEG nanocomposites crystallized slowly and the crystallization peak tended to become broader during the non-isothermal crystallization process. Furthermore, the thermal curve of the non-isothermal melt crystallization process of PLLA-PEG copolymers with different proportions of o-MMT showed that the melting point decreased gradually with the increase of o-MMT content. In the measurement of isothermal crystallization, increasing the o-MMT of the PLLA-PEG copolymers would increase the t1/2 (crystallization half time) for crystallization and decrease the value of ΔHc. However, the present study results suggest that adding o-MMT could affect the crystallization rate of PLLA-PEG copolymers. The o-MMT silicate layer was uniformly dispersed in the PLLA-PEG copolymers, forming a nucleating agent. The crystallization rate and the regularity of the crystals changed with the increase of the o-MMT content, which further affected the crystallization enthalpies.

Non-isothermal crystallisation behaviour of a Cr–Fe–Ni–Co–Mo–Si amorphous coating

The kinetics and mechanism of crystallisation of a Cr–Fe–Ni–Co–Mo–Si amorphous coating were studied using differential scanning calorimetry, owing to its relatively complex crystallisation behaviour. The premise of the production and application of amorphous materials is to understand the crystallization process of amorphous materials. It is closely related to the thermal stability of materials. Thermal stability is an important parameter to determine the effective working limit of materials. This study provides significant guidance for obtaining amorphous materials with excellent performance by controlling the crystallisation process and predicting the crystallisation failure of the coating in service. In the non-isothermal crystallisation process, results showed that the apparent activation energy (Ex) corresponding to the temperature of the onset of crystallisation was greater than those corresponding to the glass transition (Eg) and peak crystallisation (Ep) temperatures; Ex, Eg, and Ep were calculated using the Kissinger and Ozawa methods. This finding revealed that for the amorphous coating, the nucleation process was more difficult than overcoming the energy barrier for the rearrangement of atoms and the grain growth process of crystallisation. The relational plots between the local activation energy and crystallisation volume fraction under non-isothermal conditions illustrated that the crystallisation process of the amorphous coating was initially difficult but became easy in the succeeding stages. The kinetic fragility indices calculated by the Angell’s method and DA equation were 16.75 and 16.42, respectively; the results suggested that the Cr–Fe–Ni–Co–Mo–Si amorphous coating was a ‘strong material’. Furthermore, the two kinetic fragility indices indicate the good glass forming ability and thermal stability of the Cr–Fe–Ni–Co–Mo–Si amorphous coating.

ZnO-Activated Carbon Blended as a Catalyst for Oxidative Desulfurization of Dibenzothiophene

The problem of sulfur content in heavy oil is a challenge for researchers to meet the needs of environmentally friendly fuels. The catalyst preparation plays an important role in the desulfurization process. The synthesis of ZnO-activated carbon as a catalyst and its activity in oxidative desulfurization (ODS) reaction has been successfully carried out. In this work, the ZnO and activated carbon (AC) were blended by a solid-solid reaction. The ZnO, AC, and ZnO-AC were then characterized using acidity test with pyridine vapor adsorption, Fourier Transform Infra-Red (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Surface Area Analyzer (SAA). ODS of dibenzothiophene (DBT) reaction was performed by using H2O2 under variation of the reaction time (30, 60, 120, and 150 min) for the ZnO-AC catalyst. The efficiency of ODS-DBT was analyzed by a UV-Visible spectrophotometer. The XRD analysis result showed that ZnO-AC blended displays new crystal peaks of Zn in the AC diffractogram. The surface area (734.351 m2/g) and acidity (4.8780 mmol/g) of ZnO-AC were higher than ZnO and AC themselves. ZnO-AC produced the highest efficiency of ODS-DBT which was 93.83% in the reaction time of 120 min. Therefore, the simple procedure of this physical blending was proved effective to homogenize between ZnO and AC into ZnO-AC so that it has good physicochemical properties as an ODS-DBT catalyst. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Coprecipitation synthesis and microstructure characterization of nanocomposite SrCr2O4/MXene

In this work, we synthesize the strontium chromite SrCr2O4 using sol gel method. Then by using coprecipitation method nanocomposite SrCr2O4/MXene (Ti3C2) was synthesized for achieving better ionic storage. Structural and surface morphology of nanocomposite is investigated using XRD, and SEM. Further characterizations are performed using Raman Spectroscopy, photoluminescence and EDX. The band gap, as measured from UV–Vis spectrum, is reduced to 2.20 eV for nanocomposite SrCr2O4/MXene (Ti3C2) from a value of 3.51 eV for SrCr2O4. The obtained results agree with previous literature. The average crystalline size for nanocomposite SrCr2O4/MXene (Ti3C2) is 25.1 nm. All crystal peaks match with Fm-3m (225) space group having cubic spinel crystal structure. Elemental composition of the prepared samples was confirmed by EDX spectrum. The prepared nanocomposite is proposed as a potential material for higher electrocatalytic activity.

Facile Production of Graphene/Polypropylene Composites with Enhanced Electrical and Thermal Properties through In Situ Artificial Latex Preparation

In order to obtain the unique properties of graphene-based composites, to realize homogeneous dispersion of graphene throughout the polymer matrix remains the key challenge. In this work, edge-oxidized graphene/polypropylene (EOGr/PP) composites with well-dispersed EOGr in PP matrix, synchronously exhibiting high electrical conductivity and thermal property, were simply fabricated for the first time using a novel strategy by in situ artificial PP latex preparation in the presence of EOGr based on solution-emulsification technique. The good dispersion state of EOGr in the PP matrix was demonstrated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). A blue shift in Raman G peak of the EOGr nanosheets was observed in the EOGr/PP composites, indicating the strong interactions between the EOGr nanosheets and the PP matrix. The onset crystallization and crystallization peak temperatures increased as the EOGr loading increases due to its good nucleating ability. An improved thermal stability of EOGr/PP composites was observed as evaluated by TGA. The EOGr/PP composites showed an insulator-to-conductor percolation transition in between that of 1 and 2 wt% EOGr content. Such strategy provides a very effective pathway to fabricate high-performance nonpolar polymer/graphene composites with excellent dispersion state of graphene.

Crystallization behavior of impact copolymer polypropylene revealed by fast scanning chip calorimetry analysis

The crystallization behaviors of two impact copolymer polypropylenes (ICP) were investigated by using fast scanning chip calorimetry (FSC) and micro-focus wide-angle X-ray diffraction (WAXD) techniques. Different crystallization peaks of these two samples during cooling were observed at cooling rates from 50 to 4000 K/s. For ICP-A, the crystallization of polypropylene (PP) matrix into α crystallites, polyethylene (PE) sequences in ethylene-propylene segmented copolymer (EsP), PP segments in ethylene-propylene block copolymer (EbP), and PP matrix into mesophase successively occurred from high to low temperatures. As the cooling rate increased, the crystallization of PP matrix into α crystallites, PP segments, and mesophase were suppressed one by one. Nevertheless, the crystallization of PE segments was hardly suppressed. For ICP-B, it showed almost the same crystallization behavior as ICP-A, except for the absence of independent crystallization peak of PP segments. The different crystallization performance in these two samples could be ascribed to their different chain microstructures.

Encapsulation of drug into mesoporous silica by solvent evaporation: A comparative study of drug characterization in mesoporous silica with various molecular weights

Mesoporous silica (MS) is a promising material as a drug carrier that is used in pharmaceutical applications. It was discovered that the incorporation of drugs into MS has the potential to improve their dissolution and bioavailability due to the large specific surface area. This study aimed to characterize the drugs with various molecular weights in MS as well as to elucidate their impact on the loading amount and the amorphization within MS. The solvent evaporation method was used to encapsulate itraconazole (ITZ), nifedipine (NIF), and nicotinamide (NIC), respectively, into MS. The result shows the absence of glass transition and the melting peak of ITZ, NIF, and SAC within MS signifying the successful encapsulation. A hallo pattern was found in ITZ and NIF within MS indicating the amorphization. The high molecular weight and the interaction between the drug with the silica surface is reportedly contributed to the formation of the amorphous state. Meanwhile, the characteristic diffraction peaks of NIC crystal were observed for NIC within MS. In conclusion, the molecular weight of the drug has a significant effect on the loading amount and the amorphization of the drug within MS.

Preparation of Al2O3-2SiO2/geopolymer powder by hydrolytic sol-gel method and its activity characterization and research on the reaction mechanism

Herein, we report the application of sol-gel method for the preparation of a new type of highly active Al2O3-2SiO2 geopolymer precursor powder. The newly synthesized geopolymer precursor powder was characterized by SEM, XRD, TG, FTIR and MAS NMR. Experimental results showed that all the geopolymer precursor powders prepared by this method exhibited amorphous crystal structure and FTIR absorption peaks were consistent to typical aluminosilicate. TG analysis showed that G1-0-35 prepared with pure water as the aluminum source solvent had higher weightlessness rate, and with the increase of water quantity, the layered structure appeared, the resonance peak of hexacoordination Al(VI) was enhanced and the coordination of silicon was changed. ICP test results showed that the G1-0-35 precursor powder with pure water as the aluminum source solvent dissolves more quickly in the NaOH, and the relative crystallinity was the highest (84%) after alkali activation. The changes in conductivity of different geopolymer precursor powders during the reaction at different temperatures and the changes in the concentration of aluminum and silicon ions with time in the geopolymer reaction were explored, which showed that the activity of geopolymers powders increased with increasing the amount of water. The geopolymer precursor powder prepared in this study are in line with the requirements of green production, and prompts great advantages in the study of geopolymer reaction mechanism.

Preparation and Characterization of a Hybrid Complex of Cyclodextrin-Based Metal-Organic Frameworks-1 and Ascorbic Acid Derivatives.

Cyclodextrin-based metal–organic frameworks-1 (CD-MOF-1) prepared using potassium hydroxide, ethanol, and γ-cyclodextrin (γ-CD) has been reported as a new type of MOF for the development of pharmaceutical formulations. The present study aimed to investigate the physicochemical properties of ascorbic acid derivatives (L-ascorbyl 6-palmitate (ASCP); L-ascorbyl 2,6-palmitate (ASCDP)) complexed with CD-MOF-1 by a solvent evaporation method. Powder X-ray diffraction revealed that the crystal diffraction pattern of CD-MOF-1 changed from α-type to β-type when prepared by a solvent evaporation method. For ASCP/CD-MOF-1 = 1/2 and ASCDP/CD-MOF-1 = 1/4 evaporated samples, the crystal diffraction peaks derived from ASCP and ASCDP disappeared, indicating a β-like behavior. Differential scanning calorimetry results revealed that the endothermic peaks of evaporated samples (ASCP/CD-MOF-1 = 1/2 and ASCDP/CD-MOF-1 = 1/4) were not detected due to melting. Furthermore, intermolecular interactions were observed in the hydrogen bonds between the CH groups of the side chains of ASCP and ASCDP and the OH group of CD-MOF-1 in (ASCP/CD-MOF-1 = 1/2) and EVP (ASCDP/CD-MOF-1 = 1/4), based on the near-infrared absorption spectroscopy analysis. CD-MOF-1 did not form inclusion complexes with the lactone rings of ASCP and ASCDP, but with the lipophilic side chains. These results suggested that CD-MOF-1 may be useful in preparing novel drug carriers for ASCP and ASCDP.

Characterization and Analysis of Nanocrystalline Soft Magnetic Alloys: Fe Based

Soft magnetic nanocrystalline alloys have been widely analysed and studied during the past years. However, optimisation of specific chemical compositions is still being developed. The applicability of these soft nanocrystalline alloys depends mainly on the presence of the desired nanocrystalline phases within the alloy. In this study, the analysed alloys are manufactured by mechanical alloying. The analyses performed on the samples include a microstructural analysis, a thermal analysis, and a complementary functional analysis in the form of the thermomagnetic response of some samples. Regarding Fe-based alloys, thermal stability for samples containing B was higher than those containing P (crystal growth peaks in the range between 895–905 K and 775–800 K respectively). The higher magnetization of saturation, Ms, was found in Fe–Mn alloys, whereas the addition of boron provoked a decrease of Ms and the nanocrystals size.

SrO effect on the structure, phase separation and crystallization kinetics of [formula omitted] glasses

29SiO2−20B2O3−24.5Na2O−2ZrO2−(24.5−x)CaO−xSrO (x = 0, 5, 10, 15 (wt%)) glasses are studied for their non-isothermal crystallization kinetics, thermal, structural, and phase separation characteristics. The glass transition, crystallization, and peak crystallization temperature are obtained from the differential thermal analysis (DTA) curves. The characteristic temperatures shift to higher temperature with the increasing heating rate. Increase in the SrO concentration results in a decrease in Tg.The values of activation energy of glass transition and crystallization calculated using Kissinger and Augis-Benett models lie in the range 256–397 kJ/mol and 174–350 kJ/mol, respectively. Structural properties are analyzed using Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. Introduction of SrO results in variation in the BO4,BO3,andQn units in the borosilciate network. This can be used to obtain information about the structure-composition relation in the synthesized glasses. As the SrO concentration increases, the variation in the fraction of BO4 and Q2 structural units follow an opposite trend.

Variations in Microstructural and Physicochemical Properties of Candelilla Wax/Rice Bran Oil-Derived Oleogels Using Sunflower Lecithin and Soya Lecithin.

Candelilla wax (CW) is a well-known oleogelator that displays tremendous oil-structuring potential. Lecithin acts as a crystal modifier due to its potential to alter the shape and size of the fat crystals by interacting with the wax molecules. The proposed work is an attempt to understand the impact of differently sourced lecithin, such as sunflower lecithin (SFL) and soya lecithin (SYL), on the various physicochemical properties of CW and rice bran oil (RBO) oleogels. The yellowish-white appearance of all samples and other effects of lecithin on the appearance of oleogels were initially quantified by using CIELab color parameters. The microstructural visualization confirmed grainy and globular fat structures of varied size, density, packing, and brightness. Samples made by using 5 mg of SFL (Sf5) and 1 mg of SYL (Sy1) in 20 g showed bright micrographs consisting of fat structures with better packing that might have been due to the improvised crystallinity in the said samples. The FTIR spectra of the prepared samples displayed no significant differences in the molecular interactions among the samples. Additionally, the slow crystallization kinetics of Sf5 and Sy1 correlated with better crystal packing and fewer crystal defects. The DSC endotherm displayed two peaks for melting corresponding to the melting of different molecular components of CW. However, all the formulations showed a characteristic crystallization peak at ~40 °C. The structural reorganization and crystal growth due to the addition of lecithin affected its mechanical property significantly. The spreadability test among all prepared oleogels showed better spreadable properties for Sf5 and Sy1 oleogel. The inclusion of lecithin in oleogels has demonstrated an enhancement in oleogel properties that allows them to be included in various food products.

The effects of the cross‐linking mechanism of low doses of gamma irradiation on the mechanical, thermal, and viscoelastic properties of the natural rubber latex/poly(styrene‐block‐isoprene‐block‐styrene) block copolymer blend

AbstractNatural rubber latex (NRL) is a natural polymer with versatile properties. However, uncured NRL has low strength and limited practical use. Therefore, we utilized low‐dose gamma irradiation to induce cross‐linking in blended NRL/poly(styrene‐block‐isoprene‐block‐styrene) (SIS). Blends were prepared in various ratios, and the 70NRL/30SIS blend gave optimal mechanical properties. The 70NRL/30SIS blend was then irradiated from 4 to 16 kGy. An exposure of 12 kGy led to the highest tensile strength (4.49 MPa), Young's modulus (0.41 MPa), gel content (45%), and cross‐link density (12.18 × 10−5 mol·cm−3). The results of study show irradiation has improved the crystallinity of the polymer blend, which has been determined by the formation of a new NRL crystal peak at 31.2° and the decrease of the crystallization temperature from 58 to 19°C due to strain‐induced crystallization. Moreover, the radiation has transformed the 70NRL/30SIS blend irradiated at 12 kGy from liquid‐like to an elastic state that degraded at a higher temperature (392.01°C). The presence of a singlet alkyl radical peak was detected in the electron spin resonance. Therefore, the cross‐links are proposed to be C‐C bonds formed via the radiation technique. Irradiation is an effective technique to improve the performance of NRL/SIS blends without introducing any chemical cross‐linking additive.