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Fang F, Niu D, Xu P, Liu T, Yang W, Wang Z, Li X, Ma P. A Quantitative Study on Branching Density Dependent Behavior of Polylactide Melt Strength. Macromol Rapid Commun 2023; 44:e2200858. [PMID: 36661258 DOI: 10.1002/marc.202200858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/29/2022] [Indexed: 01/21/2023]
Abstract
Polymer melt strength (MS) is strongly correlated with its molecular structure, while their relationship is not very clear yet. In this work, designable long-chain branched polylactide (LCB-PLA) is prepared in situ by using a tailor-made (methyl methacrylate)-co-(glycidyl methacrylate) copolymer (MG) with accurate number of reactive sites. A new concept of branching density (φ) in the LCB-PLA system is defined to quantitively study their relationship. Importantly, a critical point of φc = 5.5 mol/104 mol C is revealed for the first time, below which the zero-shear viscosity (η0 ) corresponding to MS increases slowly with a slope of Δη0 /Δφ = 1400, while it increases sharply above this critical point due to entanglement of neighboring LCB-PLA chains. Consequently, the MS of PLA increased by >100 times by optimizing the LCB structures while maintaining processibility. Therefore, this work provides a deeper understanding and feasible route in quantitative design of polymers with high(er) melt strength for some specialty applications.
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Affiliation(s)
- Fengna Fang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
| | - Deyu Niu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
| | - Pengwu Xu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
| | - Tianxi Liu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
| | - Weijun Yang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
| | - Zhenyu Wang
- Institute of Environmental Processes and Pollution control, Jiangnan University, Wuxi, 214122, China
| | - Xiaona Li
- Institute of Environmental Processes and Pollution control, Jiangnan University, Wuxi, 214122, China
| | - Piming Ma
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
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Wang Z, Zhao Y, Wei Y. Syntheses and properties of tri- and multi-block copolymers consisting of polybutadiene and polylactide segments. RSC Adv 2022; 12:29777-29784. [PMID: 36321098 PMCID: PMC9577476 DOI: 10.1039/d2ra05051j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 10/11/2022] [Indexed: 11/07/2022] Open
Abstract
Biomaterials have drawn considerable attention in recent years because of environmental concerns. In this paper, several different poly(lactide)-b-poly(butadiene)-b-poly(lactide) (PLA-b-PB-b-PLA) triblock copolymers were synthesized by the bulk ring-opening polymerization of lactide initiated by flexible macro-initiator hydroxyl-terminated polybutadiene (HTPB) by adjusting the ratio of HTPB to lactide and the optical isomer of lactide. Afterwards, a chain-extension reaction with hexamethylene diisocyanate (HDI) was carried out to prepare (PLA-b-PB-b-PLA)n multi-block copolymers with enhanced molecular weight. The structures and properties of these block copolymers were then characterized by gel permeation chromatography (GPC), nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), atomic force microscope (AFM) and Fourier-transform infrared (FTIR). Toughening effect of the (PLA-b-PB-b-PLA)n multiblock copolymers on biodegradable poly(l-lactide) (PLLA) film was investigated and the blended film with higher (poly(d-lactide)-b-poly(butadiene)-b-poly(d-lactide))n (PDLA-b-PB-b-PDLA)n loading (15 wt%) exhibited better toughness nearly without loss of the tensile strength. The mechanical properties of the (PLA-b-PB-b-PLA)n/PLLA blended film were proved to be influenced by the different isomers of PLA and rubbery PB chains. Toughen effect of the multiblock copolymers (PLA-b-PB-b-PLA)n on PLLA was investigated and the mechanical properties of the blended films were proved to be influenced by the optical isomers of PLA, stereocomplexation and the rubbery PB chains.![]()
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Affiliation(s)
- Zhengyue Wang
- School of Polymer Science & Engineering, Qingdao University of Science and TechnologyQingdao266042China+86 053284022927
| | - Yue Zhao
- School of Polymer Science & Engineering, Qingdao University of Science and TechnologyQingdao266042China+86 053284022927
| | - Yuhan Wei
- School of Polymer Science & Engineering, Qingdao University of Science and TechnologyQingdao266042China+86 053284022927
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Przybysz-Romatowska M, Haponiuk J, Formela K. Reactive extrusion of biodegradable aliphatic polyesters in the presence of free-radical-initiators: A review. Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2020.109383] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Ge X, Chu M, Qu L, Zhang J, Li M, Li W, Yao Z. Long-lasting intrinsic polyethylene antifogging films generated by incorporating SiO 2 nanoparticles into covalently grafted antifog agents. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2020. [DOI: 10.1080/10601325.2020.1796493] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Xingshi Ge
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, P.R. China
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P.R. China
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Changchun, P.R. China
| | - Ming Chu
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, P.R. China
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P.R. China
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Changchun, P.R. China
| | - Lihang Qu
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, P.R. China
| | - Jianfu Zhang
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, P.R. China
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P.R. China
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Changchun, P.R. China
| | - Meiyuan Li
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, P.R. China
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P.R. China
| | - Wenfei Li
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, P.R. China
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Changchun, P.R. China
| | - Zhanhai Yao
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P.R. China
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