Jiang, Zhiyong; Chen, Ran; Lu, Ying; Whiteside, Ben; Coates, Phil; Wu, Zhonghua; Men, Yongfeng
Crystallization Temperature Dependence of Cavitation and Plastic Flow in the Tensile Deformation of Poly(ε-caprolactone)
In situ small-, ultrasmall-, and wide-angle X-ray scattering measurements were performed to investigate the structural evolution of crystalline lamellae and cavities as a function of deformation ratio during tensile deformation of isothermally crystallized poly(ε-caprolactone). The cavities were modeled as cylinder-shaped objects which are oriented along the stretching direction and randomly…
Syndiotactic Polystyrene/Hybrid Silica Spheres of POSS Siloxane Composites Exhibiting Ultralow Dielectric Constant
Joseph, Angel Mary; Nagendra, Baku; Surendran, K. P.; Bhoje Gowd, E.
Homogeneously dispersed hybrid silica/syndiotactic polystyrene composites were investigated for low-κ dielectric applications. The composites were prepared by a solution blending method, and their microstructures were analyzed by SEM, TEM, and AFM. Crystallization and phase transformation behavior of sPS were investigated using differential scanning calorimetry and wide-angle X-ray diffraction.…
Synthesis and self-assembly of low χ block copolymers with large periodicity
Breaux, Caleb L.; Henderson, Clifford L.; Li, Haibo; Li, Bing; Neisser, Mark
Journal of Vacuum Science & Technology B, 2017, vol 35, 6, pp. 06GI02DOI:10.1116/1.4991874Visit the full articleBack to the overview
Synthesis and characterization of tungstophosphoric acid-modified mesoporous silica nanoparticles with tuneable diameter and pore size distribution
Sosa, Alexis A.; Gorsd, Marina N.; Blanco, Mirta N.; Pizzio, Luis R.
Mesoporous silica nanoparticles were prepared in aqueous/organic phase using cetyltrimethylammonium bromide and polystyrene as organic templates. The morphology and crystalline phase of the products were characterized by scanning electron microcopy, transmission electron microscopy, X-ray diffraction, small angle X-ray scattering, and N2 adsorption/desorption isotherm analysis. The octane/water…
Synergistic enhancement of crystallization and mechanical performance of polypropylene random copolymer by strong shear and β-nucleating agent
Qi, Yanxin; Zhang, Chunbo; Zhao, Ying; Wang, Dujin; Lei, Jun; Li, Zhongming
Investigation of microstructure and properties is critical for the development and application of polymer materials. Polypropylene random copolymer (PPR) and β-nucleated PPR are widely used in water pipe production. The effect of melt shear flow on the crystalline structure and mechanical properties of PPR containing β-nucleating agent needs in-depth understanding.…
Surfactant-free microemulsion electrokinetic chromatography (SF-MEEKC) with UV and MS detection – a novel approach for the separation and ESI-MS detection of neutral compounds
Mohorič, Urška; Beutner, Andrea; Krickl, Sebastian; Touraud, Didier; Kunz, Werner; Matysik, Frank-Michael
Microemulsion electrokinetic chromatography (MEEKC) is a powerful tool to separate neutral species based on differences in their hydrophobic and hydrophilic properties. However, as a major drawback the conventionally used SDS based microemulsions are not compatible with electrospray ionization mass spectrometry (ESI-MS). In this work, a surfactant-free microemulsion (SFME) consisting of…
Surface Functionalization with Copper Tetraaminophthalocyanine Enables Efficient Charge Transport in Indium Tin Oxide Nanocrystal Thin Films
Samadi Khoshkhoo, Mahdi; Maiti, Santanu; Schreiber, Frank; Chassé, Thomas; Scheele, Marcus
Macroscopic superlattices of tin-doped indium oxide (ITO) nanocrystals (NCs) are prepared by self-assembly at the air/liquid interface followed by simultaneous ligand exchange with the organic semiconductor copper 4,4′,4″,4‴-tetraaminophthalocyanine (Cu4APc). By using X-ray photoelectron spectroscopy (XPS), grazing-incidence small-angle X-ray scattering (GISAXS), and…
Supertoughened Polylactide Binary Blend with High Heat Deflection Temperature Achieved by Thermal Annealing above the Glass Transition Temperature
Deng, Liang; Xu, Cui; Wang, Xuehui; Wang, Zhigang
Through thermal annealing above the glass transition temperature, a supertoughened binary blend with the highest notched Izod impact strength of 98 KJ/m2 was achieved, which was about 52 times of that of neat polylactide (PLA; 1.9 KJ/m2). The binary blend was composed of biocompatible and biodegradable PLA and ethylene–acrylic ester–glycidyl…
Super-Strong, Super-Stiff Macrofibers with Aligned, Long Bacterial Cellulose Nanofibers
Wang, Sha; Jiang, Feng; Xu, Xu; Kuang, Yudi; Fu, Kun; Hitz, Emily; Hu, Liangbing
With their impressive properties such as remarkable unit tensile strength, modulus, and resistance to heat, flame, and chemical agents that normally degrade conventional macrofibers, high-performance macrofibers are now widely used in various fields including aerospace, biomedical, civil engineering, construction, protective apparel, geotextile, and electronic areas. Those macrofibers with a…
Supernucleation and Orientation of Poly(butylene terephthalate) Crystals in Nanocomposites Containing Highly Reduced Graphene Oxide
Colonna, Samuele; Pérez-Camargo, Ricardo A.; Chen, Haiming; Liu, Guoming; Wang, Dujin; Müller, Alejandro J.; Saracco, Guido; Fina, Alberto
The ring-opening polymerization of cyclic butylene terephthalate into poly(butylene terephthalate) (pCBT) in the presence of reduced graphene oxide (RGO) is an effective method for the preparation of polymer nanocomposites. The inclusion of RGO nanoflakes dramatically affects the crystallization of pCBT, shifting crystallization peak temperature to higher temperatures and, overall, increasing…