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Your search keyword '"Xiaohua Chang"' showing total 4 results
Start Over Author "Xiaohua Chang" Journal macromolecules
4 results on '"Xiaohua Chang"'

2. Stepwise Crystallization and Induced Microphase Separation in Nucleobase-Monofunctionalized Supramolecular Poly(ε-caprolactone)

Author

Pengju Pan, Xing Li, Xiaohua Chang, Yongzhong Bao, Ying Zheng, Guorong Shan, Wenqing Xu, and Lingling Ni

Subjects
chemistry.chemical_classification, Polymers and Plastics, Chemistry, Organic Chemistry, technology, industry, and agriculture, Supramolecular chemistry, macromolecular substances, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Combinatorial chemistry, 0104 chemical sciences, law.invention, Nucleobase, Inorganic Chemistry, Supramolecular polymers, chemistry.chemical_compound, law, Materials Chemistry, Surface modification, Crystallization, 0210 nano-technology, Caprolactone
Abstract

End functionalization of homopolymers by noncovalent binding units is a straightforward approach to prepare supramolecular polymers with a broad application scope as stimuli-responsive functional m...

Published
2021
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3. Preferential Formation of β-Form Crystals and Temperature-Dependent Polymorphic Structure in Supramolecular Poly(<scp>l</scp>-lactic acid) Bonded by Multiple Hydrogen Bonds

Author

Xiaohua Chang, Qing Xie, Pengju Pan, Jianna Bao, Guorong Shan, Chengtao Yu, and Yongzhong Bao

Subjects
chemistry.chemical_classification, Materials science, Polymers and Plastics, Hydrogen bond, Organic Chemistry, Supramolecular chemistry, 02 engineering and technology, Crystal structure, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, law.invention, Inorganic Chemistry, Supramolecular polymers, Crystallography, Crystallinity, chemistry, law, Materials Chemistry, Surface modification, Crystallization, 0210 nano-technology
Abstract

Supramolecular polymers (SMPs) have quite different crystallization behavior from the conventional polymers, because of the confinement effects of supramolecular units. Crystallization of SMPs undergoes in a “confined” and “dynamic” manner. Herein, we selected the 2-ureido-4[1H]-pyrimidione (UPy)-bonded poly(l-lactic acid) (PLLA) as a model SMP and investigated the crystallization kinetics, polymorphic crystalline structure and phase transition of supramolecular PLLAs (SM-PLLAs). SM-PLLAs were synthesized by the end functionalization of hydroxyl-terminated 2- and 3-arm PLLA precursors with different molecular weights. Crystallization rate and crystallinity of SM-PLLAs are strongly depressed in both nonisothermal and isothermal crystallizations, as compared to the nonfunctionalized PLLA precursors. Crystalline structure of SM-PLLAs is sensitive to the crystallization temperature (Tc). A low Tc (75–95 °C) facilitates the formation of metastable β crystals of PLLA in SM-PLLAs; while a high Tc (100–130 °C) fa...

Published
2017
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