Skip to main content
search
Category

Polymer research

Phase transitions of the rapid-compression-induced mesomorphic isotactic polypropylene under high-pressure annealing

Fu, Xiaobo; Jia, Wenxia; Li, Xiaoting; Wang, Yaming; Wang, Zhen; Liu, Chuntai; Shen, Changyu; Shao, Chunguang

 (Natural) polymersApplicationCharacterizationCrystalline fractionCustomer publicationsMaterialPhase analysisPolymer researchSAXSTechnique

Phase transitions of the rapid-compression-induced mesomorphic isotactic polypropylene under high-pressure annealing

Fu, Xiaobo; Jia, Wenxia; Li, Xiaoting; Wang, Yaming; Wang, Zhen; Liu, Chuntai; Shen, Changyu; Shao, Chunguang

The mesomorphic isotactic polypropylene was prepared by rapid compression instead of the common method of temperature quenching, and their phase transition under high pressure was investigated in depth by combining wide-angle X-ray diffraction, small-angle X-ray scattering, and differential scanning calorimetry techniques. It was found that annealing under pressure can promote…
Directed Assembly of Hierarchical Supramolecular Block Copolymers: A Strategy To Create Donor–Acceptor Charge-Transfer Stacks

Deepthi, Krishnan; Amal, Raj R. B.; Rajeev, V. R.; Unni, K. N. Narayanan; Gowd, E. Bhoje

 (Natural) polymersApplicationCharacterizationCustomer publicationsMaterialPhase analysisPolymer researchSAXSTechniqueTemperatureWAXS

Directed Assembly of Hierarchical Supramolecular Block Copolymers: A Strategy To Create Donor–Acceptor Charge-Transfer Stacks

Deepthi, Krishnan; Amal, Raj R. B.; Rajeev, V. R.; Unni, K. N. Narayanan; Gowd, E. Bhoje

Macromolecules, 2019, vol 52, 7, pp. 2889-2899DOI:10.1021/acs.macromol.8b02448Visit the full articleBack to the overview
Self-Assembly Investigations of Sulfonated Poly(methyl methacrylate- block -styrene) Diblock Copolymer Thin Films

Piñón-Balderrama, Claudia; Leyva-Porras, César; Olayo-Valles, Roberto; Revilla-Vázquez, Javier; Schubert, Ulrich S.; Guerrero-Sanchez, Carlos; Bonilla-Cruz, José

 (Natural) polymersApplicationCharacterizationCustomer publicationsMaterialPhase analysisPolymer researchSAXSTechnique

Self-Assembly Investigations of Sulfonated Poly(methyl methacrylate- block -styrene) Diblock Copolymer Thin Films

Piñón-Balderrama, Claudia; Leyva-Porras, César; Olayo-Valles, Roberto; Revilla-Vázquez, Javier; Schubert, Ulrich S.; Guerrero-Sanchez, Carlos; Bonilla-Cruz, José

Poly(methyl methacrylate- block -styrene) block copolymers (BCs) of low dispersity were selectively sulfonated on the styrenic segment. Several combinations of degree of polymerization and volume fraction of each block were investigated to access different self-assembled morphologies. Thin films of the sulfonated block copolymers were prepared by spin-coating and…
Electrospun PCL-protein scaffolds coated by pyrrole plasma polymerization

Cruz, Yeyzon; Muñoz, Efrén; Gomez-Pachón, E. Y.; Morales-Corona, Juan; Olayo-Lortia, Jesús; Olayo, Roberto; Olayo-Valles, Roberto

 (Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsFibersMaterialPhase analysisPolymer researchSAXSTechniqueWAXS

Electrospun PCL-protein scaffolds coated by pyrrole plasma polymerization

Cruz, Yeyzon; Muñoz, Efrén; Gomez-Pachón, E. Y.; Morales-Corona, Juan; Olayo-Lortia, Jesús; Olayo, Roberto; Olayo-Valles, Roberto

Polymeric scaffolds prepared from polycaprolactone (PCL), PCL-collagen and PCL-elastin were prepared by electrospinning. The scaffolds were coated by plasma polymerization of pyrrole doped with iodine, to improve cellular adhesion and fibroblast proliferation. The morphology, composition, and crystalline structure of the scaffolds were characterized by scanning electron microscopy (SEM),…
Multiscale Self-Assembly of a Phenyl-Flanked Diketopyrrolopyrrole Derivative: A Solution-Processable Building Block for π-Conjugated Supramolecular Polymers

Wang, Kai; Bohra, Hassan; Gonçalves, Rui A.; Bhatnagar, Harshangda; Wu, Yingjie; Wang, Xiaochen; Wang, Zheng; Wei, Xin; Lam, Yeng Ming; Wang, Mingfeng

 (Natural) polymersApplicationCharacterizationCustomer publicationsLiquid crystalsMaterialPhase analysisPolymer researchSAXSSelf-assembled materialTechniqueTemperatureWAXS

Multiscale Self-Assembly of a Phenyl-Flanked Diketopyrrolopyrrole Derivative: A Solution-Processable Building Block for π-Conjugated Supramolecular Polymers

Wang, Kai; Bohra, Hassan; Gonçalves, Rui A.; Bhatnagar, Harshangda; Wu, Yingjie; Wang, Xiaochen; Wang, Zheng; Wei, Xin; Lam, Yeng Ming; Wang, Mingfeng

We report a solution-processable π-conjugated molecular building block (denoted as PhDPP) consisting of a rigid and planar core of phenyl-flanked diketopyrrolopyrrole and “soft” branched alkoxy chains that endow the solubility in a variety of organic solvents. Intermolecular hydrogen bonding in PhDPP was revealed in nonpolar solvents above a threshold of…
Highly compressive and stretchable poly(ethylene glycol) based hydrogels synthesised using pH-responsive nanogels without free-radical chemistry

Nguyen, Nam T.; Milani, Amir H.; Jennings, James; Adlam, Daman J.; Freemont, Anthony J.; Hoyland, Judith A.; Saunders, Brian R.

 (Hydro)gelsApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchSAXSTechnique

Highly compressive and stretchable poly(ethylene glycol) based hydrogels synthesised using pH-responsive nanogels without free-radical chemistry

Nguyen, Nam T.; Milani, Amir H.; Jennings, James; Adlam, Daman J.; Freemont, Anthony J.; Hoyland, Judith A.; Saunders, Brian R.

Poly(ethylene glycol) (PEG) based hydrogels are amongst the most studied synthetic hydrogels. However, reports on PEG-based hydrogels with high mechanical strength are limited. Herein, a class of novel, well-defined PEG-based nanocomposite hydrogels with tunable mechanical strength are synthesised via ring-opening reactions of diglycidyl ethers with carboxylate ions. The pH responsive…
Tuning the properties of electrospun polylactide mats by ethanol treatment

Pavlova, Elizaveta R.; Bagrov, Dmitry V.; Monakhova, Kristina Z.; Piryazev, Alexey A.; Sokolova, Anastasia I.; Ivanov, Dimitri A.; Klinov, Dmitry V.

 (Natural) polymersApplicationCharacterizationCustomer publicationsFibersMaterialOrientation analysisPolymer researchTechniqueWAXS

Tuning the properties of electrospun polylactide mats by ethanol treatment

Pavlova, Elizaveta R.; Bagrov, Dmitry V.; Monakhova, Kristina Z.; Piryazev, Alexey A.; Sokolova, Anastasia I.; Ivanov, Dimitri A.; Klinov, Dmitry V.

In the present work, we analyzed the changes in structure and mechanical properties of electrospun PLA mats induced by ethanol treatment. The amorphous PLA mats gained elasticity when immersed into ethanol (the elongation at break increased from ?~50% in air to ?~280% in ethanol) and partly retained it after drying…
Simultaneous SAXS-WAXS Experiments on Semi-Crystalline Polymers: Example of PA11 and Its Brill Transition

Tencé-Girault, Sylvie; Lebreton, Sylvie; Bunau, Oana; Dang, Patrick; Bargain, François

 (Natural) polymersApplicationCharacterizationCrystalline fractionCustomer publicationsMaterialPhase analysisPolymer researchSAXSTechniqueTemperatureWAXS

Simultaneous SAXS-WAXS Experiments on Semi-Crystalline Polymers: Example of PA11 and Its Brill Transition

Tencé-Girault, Sylvie; Lebreton, Sylvie; Bunau, Oana; Dang, Patrick; Bargain, François

This manuscript of the special issue “Microstructural Evolution and Mechanical Behavior of Semi-Crystalline Polymers” aims to show that Small Angle X-ray Scattering (SAXS) and Wide Angle X-ray Scattering (WAXS) experiments performed simultaneously constitute a unique tool to obtain valuable information on the hierarchical structure of semi-crystalline polymers. These structural quantitative…
Formation and evolution of shish-kebab structure during hot stretching in gel-spun ultra-high molecular weight polyethylene fibers with high concentration gel solution

An, Minfang; Lv, You; Xu, Haojun; Li, Yiguo; Wang, Zongbao

 (Natural) polymersApplicationCharacterizationCustomer publicationsMaterialOrientation analysisPolymer researchSAXSTechniqueTensile

Formation and evolution of shish-kebab structure during hot stretching in gel-spun ultra-high molecular weight polyethylene fibers with high concentration gel solution

An, Minfang; Lv, You; Xu, Haojun; Li, Yiguo; Wang, Zongbao

Formation and evolution of shish‐kebab crystals of gel‐spun ultra‐high molecular weight polyethylene fibers from high concentration gel solution during hot‐stretching process were studied by in situ small‐angle X‐ray scattering and wide‐angle X‐ray diffraction measurements, differential scanning calorimetry, and scanning electron microscopy. We show that the structural evolution process can be…
Effect of solvent-matrix interactions on structures and mechanical properties of micelle-crosslinked gels

Xu, Dan; Xu, Ting; Gao, Guorong; Xiao, Ying; Wang, Zongbao; Chen, Jing; Zhou, Yang; Wang, Rong; Yin, Jingbo; Fu, Jun

 (Hydro)gelsApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOrientation analysisPolymer researchSAXSTechniqueTensile

Effect of solvent-matrix interactions on structures and mechanical properties of micelle-crosslinked gels

Xu, Dan; Xu, Ting; Gao, Guorong; Xiao, Ying; Wang, Zongbao; Chen, Jing; Zhou, Yang; Wang, Rong; Yin, Jingbo; Fu, Jun

Previous studies on hydrogels crosslinked by acrylated PEO99–PPO65–PEO99 triblock copolymer (F127DA) micelles demonstrate outstanding strength and toughness, which is attributed to the efficient energy dissipation through the hydrophobic association in the micelles. The current study further focuses on how the solvent property affects the structures and the mechanical properties of…
Close Menu