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Bian X, Ma L, Yang C, Zhang F, Zhang S, Li Y, Gao K, Liu B, Wang Z. Synthesis and properties of bio-based semi-aromatic heat-resistant copolymer polyamide 5T-co-6T. Des Monomers Polym 2024; 27:87-102. [PMID: 39139779 PMCID: PMC11321112 DOI: 10.1080/15685551.2024.2390700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Accepted: 08/06/2024] [Indexed: 08/15/2024] Open
Abstract
Herein, poly(pentanediamine terephthalamide) (PA5T) homopolymer was synthesized via a salt-forming reaction+solid state polycondensation method using bio-based 1,5-pentanediamine and terephthalic acid as the primary raw materials. To address the issue of its narrower processing window, poly(hexamethylene terephthalamide)(PA6T), which also cannot be melt processed due to the processing window is negative, was introduced into its molecular chain to synthesize poly (pentanediamine/hexanediamine terephthaloyl) (PA5T-co-6T) copolymers. The structures were investigated by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance carbon spectroscopy (13C-NMR). Furthermore, the melting temperature, crystallization temperature, thermal stability, and crystal growth mode of the polymer were tested and analyzed using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and wide-angle x-ray diffraction (WAXD), respectively. The results demonstrate that the crystal growth mode gradually changes from three-dimensional spherical growth to two-dimensional disk-like or three-dimensional spherical growth with the increase of 6T chain segment content. Simultaneously, the crystallization temperature, melting temperature, and crystallization rate of the polymer all showed a trend of decreasing first and then increasing, which was due to the combined effects of the increase in the content of 6T chain segments on the molecular-chain structure and crystal structure of the polymer. Bio-based PA5T-co-6T has excellent heat resistance and a wider processing window than PA5T and PA6T, which possesses great application prospects in the fields of automotive, electronic appliances, and LED optics.
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Affiliation(s)
- Xiangcheng Bian
- Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan, Shanxi, China
| | - Liqun Ma
- Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan, Shanxi, China
| | - Chen Yang
- Research and Development Center, Cathay Biotech Inc, Shanghai, China
| | - Fuchun Zhang
- Research and Development Center, Cathay Biotech Inc, Shanghai, China
| | - Shuo Zhang
- Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan, Shanxi, China
| | - Yuan Li
- Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan, Shanxi, China
| | - Kai Gao
- Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan, Shanxi, China
| | - Bingxiao Liu
- Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan, Shanxi, China
| | - Zhongqiang Wang
- Technology center, Guangdong Sinoplast Advanced Material Co. Ltd, Dongguan, Guangdong, China
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Zhou R, Zhong L, Jia S, Luo Y, Li Y, Tang Y. Preparation and characterization of aspirin-fucoidan complex and its admirable antitumor activity on human non-small cell lung cancer cells. Int J Biol Macromol 2024; 263:130163. [PMID: 38367783 DOI: 10.1016/j.ijbiomac.2024.130163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/26/2024] [Accepted: 02/11/2024] [Indexed: 02/19/2024]
Abstract
The purpose of this work is to prepare a novel acetylated derivative of Undaria pinnatifida fucoidan (UPFUC) with admirable antitumor activity. Fucoidan was first acetylated by acetylsalicylic acid (aspirin, ASA) to form the ASA-UPFUC complex. The antitumor efficacy results stated that ASA-UPFUC inhibited the proliferation of human non-small cell lung cancer A549 cells in a dose-dependent manner, with an IC50 value of 49.09 μg/mL, 50.20 % lower than that of UPFUC. Importantly, the acetylation process had no adverse effects on the backbone structure of UPFUC. Simultaneously, ASA-UPFUC demonstrated a larger charge density than UPFUC, leading to enhanced solubility, improved surface charge effects, and a greater potential for exerting biological activity. Consequently, ASA-UPFUC increased the formation of alkyl and hydrogen bonds with tumor necrosis factor related apoptosis-inducing ligand receptors DR4 and DR5, thereby effectively stimulating the generation of cellular reactive oxygen species, diminishing mitochondrial membrane potential, suppressing nuclear factor κB (NFκB) p65 phosphorylation, enhancing the contents of Bax and cleaved caspase 3, and reducing the level of Bcl-2. The collective effects ultimately triggered the mitochondrial apoptotic pathway, leading to apoptosis in A549 cells. The findings support the potential utilization of ASA-UPFUC as a novel dietary additive for human lung cancer chemoprevention.
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Affiliation(s)
- Rong Zhou
- Department of Food Science and Engineering, School of Chemical Engineering, Xiangtan University, Xiangtan, China
| | - Liang Zhong
- Department of Food Science and Engineering, School of Chemical Engineering, Xiangtan University, Xiangtan, China
| | - Shuting Jia
- Department of Food Science and Engineering, School of Chemical Engineering, Xiangtan University, Xiangtan, China
| | - Yuanyuan Luo
- Department of Food Science and Engineering, School of Chemical Engineering, Xiangtan University, Xiangtan, China
| | - Yuqin Li
- Department of Food Science and Engineering, School of Chemical Engineering, Xiangtan University, Xiangtan, China.
| | - Yufang Tang
- Department of Food Science and Engineering, School of Chemical Engineering, Xiangtan University, Xiangtan, China.
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Non‑isothermal crystallization kinetics of polycaprolactone-based composite membranes. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03335-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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High-value copolyamide 6 materials with colorless transparent and low water absorption upgraded from upcycled and biomass comonomers. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Biobased Copolyamides 56/66: Synthesis, Characterization and Crystallization Kinetics. Polymers (Basel) 2022; 14:polym14183879. [PMID: 36146024 PMCID: PMC9504581 DOI: 10.3390/polym14183879] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/10/2022] [Accepted: 09/13/2022] [Indexed: 11/25/2022] Open
Abstract
This study synthesized a series of new biobased copolyamides (co-PAs), namely PA56/PA66 with various comonomer ratios, by using in situ polycondensation. The structures, compositions, behaviors, and crystallization kinetics of the co-PAs were investigated through proton nuclear magnetic resonance (1H NMR) spectroscopy, gel permeation chromatography (GPC), Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X-ray diffraction (XRD). The influence of the composition of co-PAs on their mechanical properties and thermal stability was investigated. The co-PAs exhibited a eutectic melting point when the PA56 content was 50 mol%, with the crystallization temperature decreasing from 229 to a minimum 188 °C and the melting temperature from 253 to a minimum 218 °C. The results indicated that the tensile strength and flexural modulus first decreased and then increased as the PA66 content increased. The nonisothermal crystallization kinetics of the PA56/PA66 co-PAs were analyzed using both the Avrami equation modifications presented by Jeziorny and Mo. The results also indicated that the crystallization rate of the PA56/PA66 co-PAs was higher than that of PA56.
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Yang K, Liu Y, Zheng Z, Lu G, Tang Z, Chen X. Synthesis and thermal degradation mechanism of a semi-aromatic copolyamide from renewable sources. Polym Degrad Stab 2022. [DOI: 10.1016/j.polymdegradstab.2022.110089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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