Yang Yu
Dalian University of Technology
MiscibilityUltimate tensile strengthCrystal structurePolyesterIsomerizationSmall-angle X-ray scatteringMelting pointCopolymerCatalysisMonomerChemistryPolymer chemistryMaterials scienceCrystallizationSebacic acidLactideIsosorbidePolybutylene succinateGlutaric acidPimelic acidCopolyesterComonomerEnthalpyElongationChemical engineeringPolymerizationCrystallinityPolymerCondensation polymerAmorphous solidCrystalCrystallographyMicrostructureThermoplastic elastomer
18Publications
10H-index
169Citations
Publications 18
Newest
#1Deng Pan (DUT: Dalian University of Technology)
#2Gen Luo (Anda: Anhui University)H-Index: 13
Last. Yi Luo (DUT: Dalian University of Technology)H-Index: 26
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Computational studies on Ir(III)-catalyzed intermolecular branch-selective allylic C–H amination of terminal olefins with methyl dioxazolone have been carried out to investigate the mechanism, including the origins of regioselectivity and catalytic activity difference. The result suggests that the reaction proceeds through generation of active species, alkene coordination, allylic C–H activation, decarboxylation, migratory insertion, and protodemetalation. The presence of AgNTf2 could thermodyna...
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#1Shengnan Shao (DUT: Dalian University of Technology)H-Index: 3
#2Zhiyong Wei (DUT: Dalian University of Technology)H-Index: 21
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 16
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Biobased odd–odd poly(propylene dicarboxylate)s, based on 1,3-propanediol and three odd diacids [i.e., glutaric acid (C5), pimelic acid (C7) or azelaic acid (C9)], have been synthesized and analyzed, in order to study the effect of chain length of aliphatic diacids on thermal properties. Crystallization and melting behaviors were investigated by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), temperature-modulated differential scanning calorimetry (TMDSC) and polari...
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#1Changfeng Zhou (DUT: Dalian University of Technology)H-Index: 1
#2Zhiyong Wei (DUT: Dalian University of Technology)H-Index: 21
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 16
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Abstract A series of biobased long-chain aliphatic polyesters with high molecular weight were synthesized by a two-step process of esterification and polycondensation from 1,12-dodecanedioic acid and diols with nine different carbon chain lengths from C2 to C10. The influences of the chain length of diols and its even-odd effect on the chemical structure, basic thermal properties and thermal stability, crystalline structure and morphology, as well as mechanical properties of the obtained polyest...
7 CitationsSource
#1Yang Yu (DUT: Dalian University of Technology)H-Index: 10
#2Haocheng Xiong (DUT: Dalian University of Technology)H-Index: 1
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 16
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This work describes the synthesis, structure, and physical and thermomechanical properties of fully biobased unsaturated copolyesters via melt-polycondensation of renewable monomers trans-β-hydromuconic acid and fumaric acid with 1,4-butanediol conducted by a two-step polymerization employing stannous octoate as a catalyst and 4-methoxyphenol as a radical inhibitor. The polymerization conditions, including catalyst amount, second-stage reaction temperature, and time, were optimized to prepare hi...
4 CitationsSource
#1Yang Yu (DUT: Dalian University of Technology)H-Index: 10
#2Zhiyong Wei (DUT: Dalian University of Technology)H-Index: 21
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 17
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Maleate and fumarate-based unsaturated copolyesters are of interest as biomedical materials with tailorable properties. However, the preparation of unsaturated copolyesters with controllable maleate (cis) and fumarate (trans) isomer compositions is still a great challenge in polymer chemistry, because cis units always unbridledly isomerize to trans units in the polymerization process. Herein, we have presented a universal method for the facile synthesis of stereochemistry-controllable poly(butyl...
12 CitationsSource
#1Tong Wu (DUT: Dalian University of Technology)H-Index: 3
#2Zhiyong Wei (DUT: Dalian University of Technology)H-Index: 21
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 16
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Abstract In this work, a series of highly branched linear-comb random copolyesters of e-caprolactone (CL) and δ-valerolactone (VL) with high molecular weight and narrow distribution in various compositions were successfully synthesized. The composition-dependent microstructure, thermal and mechanical properties, and enzymatic degradation behavior of the resulting copolyesters were investigated systematically. The cocrystallization behavior was observed for the highly branched linear-comb random ...
13 CitationsSource
#1Yang Yu (DUT: Dalian University of Technology)H-Index: 10
#2Zhiyong Wei (DUT: Dalian University of Technology)H-Index: 21
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 16
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Abstract Unsaturated copolyesters poly(butylene succinate-co-cis-butene succinate) (P(BS-co-cBS)) were the first time prepared by polycondensation in combination with stannous octoate as catalyst and 4-methoxyphenol as radical inhibitor, achieving linear random copolyesters with a number-average molecular weight up to 38.2 kg/mol. The cis-2-butene-1, 4-diol used in this work showed a peculiarity of no isomerization or cross-linking side reaction even at high reaction temperatures, due to the hig...
9 CitationsSource
#1Yang Yu (DUT: Dalian University of Technology)H-Index: 10
#2Zhiyong Wei (DUT: Dalian University of Technology)H-Index: 21
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 17
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Abstract Two series of biobased even-odd aliphatic copolyesters, poly(butylene glutarate-co-butylene azelate) (PBGA) and poly(octylene glutarate-co-octylene azelate) (POGA), were prepared from even diol of 1,4-butanediol or 1,8-octanediol with odd diacids of glutaric acid and azelaic acid, respectively. These even-odd copolyesters can cocrystallize within the entire composition range despite being random, displaying a pseudo-eutectic point when their melting points are plotted as a function of c...
9 CitationsSource
#1Chenhao Jin (DUT: Dalian University of Technology)H-Index: 4
#2Zhiyong Wei (DUT: Dalian University of Technology)H-Index: 21
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 16
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Abstract Ring opening copolymerization of ethylene brassylate (EB) and δ-valerolactone (δ-VL) with various feeding ratios catalyzed by triphenyl bismuth was performed to prepare poly(ethylene brassylate-co-δ-valerolactone) copolyesters. The reactivity ratios of EB and δ-VL were firstly determined to be r EB = 0.64 and r VL = 2.54 , respectively. Then the copolymerization kinetics was traced and microstructure analysis showed that the chain structure of copolyesters were rearranged towards comple...
13 CitationsSource
#1Cheng Zhou (DUT: Dalian University of Technology)H-Index: 10
#2Zhiyong Wei (DUT: Dalian University of Technology)H-Index: 21
Last. Yang Li (DUT: Dalian University of Technology)H-Index: 16
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Abstract Biobased thermoplastic elastomers are of interest for their merits, especially renewability and sustainability. In this work, a series of fully biobased linear comb poly(β-myrcene)- graft -poly( l -lactide) (PM- g -PLLA) copolymers consisting of interior rubbery block and exterior semicrystalline block were synthesized via ring-opening polymerization of l -lactide using hydroxylated poly(β-myrcene) as macroinitiator. To evaluate the effects of branch length and graft density of poly(β-m...
14 CitationsSource