Xiong, Bijin; Chen, Ran; Zeng, Fangxinyu; Kang, Jian; Men, Yongfeng
Thermal shrinkage and microscopic shutdown mechanism of polypropylene separator for lithium-ion battery: In-situ ultra-small angle X-ray scattering study
Structural variation and shutdown behavior of polypropylene separator for lithium-ion batteries upon heating have been investigated via in-situ ultra-small angle X-ray scattering (USAXS) tests. Structural parameters including porosity, specific interface and pore size have been successfully estimated by fitting the scattering intensity with craze model. The fitting results reveal that…
The structure evolution of polyamide 1212 after stretched at different temperatures and its correlation with mechanical properties
Cai, Ziqing; Liu, Xiaoyi; Zhou, Qiong; Wang, Yaotao; Zhu, Caizhen; Xiao, Xueliang; Fang, Dong; Bao, Haifeng
The development of polyamide fibers with excellent mechanical performance is always a hot research topic. In this paper, the structure evolution of polyamide 1212 (PA1212) after stretching at different temperatures was characterized by Wide-Angle X-ray Diffraction (WAXD) and Small-Angle X-ray Scattering (SAXS) techniques. Experimentally, it was found that there existed…
Theoretical and experimental study of isothiazolinone adsorption onto ordered mesoporous silica
Mardones, Lucas E.; Legnoverde, María Soledad; Simonetti, Sandra; Basaldella, Elena I.
Mesoporous silica SBA-15 particles were synthesized in order to evaluate their effectiveness as encapsulating agents for a commercial biocide composed of a mixture of methylisothiazolinone and chloromethylisothiazolinone (MIT/CMIT). Three powdered samples of silica particles having different textural properties, sizes and morphologies were hydrothermally obtained and then characterized by SEM,…
Thermotropic Phase Behavior of Choline Soaps
Klein, Regina; Dutton, Helen; Diat, Olivier; Tiddy, Gordon J. T.; Kunz, Werner
Choline carboxylates (ChCm with m = 12−18) are simple biocompatible anionic surfactants with very low Krafft temperatures, possessing a rich aqueous phase behavior. In the present work, we have investigated the thermotropic mesomorphism of anhydrous ChCm salts for m = 12−18. Transition temperatures and enthalpies determined by differential scanning calorimetry…
Thermal-Induced Denaturation and Aggregation Behavior of Lysozyme and Bovine Serum Albumin: a Thermodynamic and Structural Study
Perez, Aline Sanches; Oliveira, Cristiano Luis Pinto
Solution studies permit a direct investigation of the particles on a well-defined environment. Fluorescence, circular dichroism, scattering, and calorimetry provide, individually, very important information among the protein structure, overall shape, and thermodynamic equilibrium. In this work, a combination of these techniques is presented for the study of denaturation induced by…
Thermally conductive thin films derived from defect free graphene-natural rubber latex nanocomposite: Preparation and properties
George, Gejo; Sisupal, Suja Bhargavan; Tomy, Teenu; Pottammal, Bincy Akkoli; Kumaran, Alaganandam; Suvekbala, Vemparthan; Gopimohan, Rajmohan; Sivaram, Swaminathan; Ragupathy, Lakshminarayanan
Commercially useful rubber products viz. gloves, condoms, tyres, and rubber hoses used in high temperature environments, etc., require efficient thermal conductivity, which increases the lifetime of these products. Graphene can fetch this property, if it is effectively incorporated into the rubber matrix. The great challenge in preparing graphene-rubber nanocomposites is…
The extent of maize starch crystal melting as a critical factor in the isolation of amylose via aqueous leaching
Doblado-Maldonado, Andrés F.; Gomand, Sara V.; Goderis, Bart; Delcour, Jan A.
Aqueous leaching from granular maize starch is a common technique for amylose (AM) isolation. Leaching was studied in a 60–90 °C temperature range. The leachate yield, degree of polymerization (DP) and purity were related to the extent of melting of the starch crystals at the leaching temperature as determined via differential…
The effect of chitin nanocrystal on the structural transition of shish-kebab to fibrillar crystals of ultra-high molecular weight polyethylene/chitin nanocrystal fibers during hot-stretching process
An, Minfang; Xu, Haojun; Lv, You; Tian, Feng; Gu, Qun; Wang, Zongbao
The pre-stretched ultra-high molecular weight polyethylene/chitin nanocrystal composite fibers after first hot-stretching stage were prepared. The effect of chitin nanocrystal on the structural evolution of shish-kebab to fibrillar crystals of ultra-high molecular weight polyethylene/chitin nanocrystal fibers during hot-stretching process was studied by using in-situ small-angle X-ray scattering,…
Tensile modulus enhancement and mechanism of polyimide fibers by post-thermal treatment induced microvoid evolution
Yi, Xiaolin; Gao, Yunyun; Zhang, Mengying; Zhang, Chunbo; Wang, Qiao; Liu, Guoming; Dong, Xia; Wu, Dezhen; Men, Yongfeng; Wang, Dujin
The correlation between mechanical property and the microstructure of two-step wet spinning polyimide (PI) fibers after thermal annealing was investigated. In-situ wide-angle X-ray diffraction (WAXD) and ex-situ small angle X-ray scattering (SAXS) methods were utilized to study the liquid crystal-like structure orientation and microvoids structure (the length and the orientation…
Tensile Deformation of Oriented Poly(ε-caprolactone) and Its Miscible Blends with Poly(vinyl methyl ether)
Jiang, Zhiyong; Wang, Yaotao; Fu, Lianlian; Whiteside, Ben; Wyborn, John; Norris, Keith; Wu, Zhonghua; Coates, Phil; Men, Yongfeng
The structural evolution of micromolded poly(ε-caprolactone) (PCL) and its miscible blends with noncrystallizable poly(vinyl methyl ether) (PVME) at the nanoscale was investigated as a function of deformation ratio and blend composition using in situ synchrotron small-angle X-ray scattering (SAXS) and scanning SAXS techniques. It was found that the deformation mechanism…