Semi-aromatic copolyesters with high strength and fire safety via hydrogen bonds and π-π stacking

Ni, Yan‐Peng; Li, Qi-Tian; Chen, Lin; Wu, Wan‐Shou; Qin, Zihao; Zhang, Yi; Wang, Xiuli; Wang, Yu‐Zhong

doi:10.1016/j.cej.2019.05.212

Cited by 73 publications

(24 citation statements)

References 73 publications

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“…As mentioned above, all O–H groups are involved in the formation of hydrogen bonds for A35. At elevated temperature, it is found that the hydrogen‐bonded O–H bands shift to higher frequencies because the dissociation of the hydrogen‐bonded O–H groups, 27–29 thereinto, the “free” O–H groups (3540 cm −1 ) is clearly detected as the temperature rises to 180°C. As seen from the inset in Figure 1b, both the intensity and peak position of the C=O band are independent of temperature.…”

Section: Resultsmentioning

confidence: 99%

Construction of strong non‐covalent interactions for preparation of flame‐retarded acrylic pressure‐sensitive adhesives with improved shear and peel strengths

Liu

Zhao

Lin

2022

J of Applied Polymer Sci

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The development of acrylic pressure-sensitive adhesives (PSAs) with good flame retardancy is of great importance for the optoelectronic, automobile, and aircraft applications. However, a well-known problem is that conventional flame retardants, while imparting good flame retardant properties to acrylic PSAs, compromise the cohesion and result in the unsatisfactory shear and peel strengths. In this work, flame-retarded acrylic PSAs with improved shear and peel strengths were successfully prepared by constructing a tight non-covalent crosslinking network that effectively counteract the negative effect of flame retardants on cohesion. In addition, the combination of dimethyl methylphosphonate (DMMP) and SiO 2 increases the flame retardant effectiveness and reduces the overall required loading of flame retardants. As an example, when the amount of acrylic acid (AA) was 35 wt%, acrylic PSA containing 12.7 wt% DMMP and 2.5 wt% SiO 2 particles showed well-balanced adhesive properties and flame retardancy, with a shear strength of 3600 min and a peel strength of 15.0 N/25 mm, as well as a UL-94 V-0 rating. Meanwhile, it exhibited a high transmittance of above 90%. Furthermore, TG-FTIR results confirmed that the flame-retarded behaviors occurred in vapor phase.

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Section: Resultsmentioning

confidence: 99%

Construction of strong non‐covalent interactions for preparation of flame‐retarded acrylic pressure‐sensitive adhesives with improved shear and peel strengths

Liu

Zhao

Lin

2022

J of Applied Polymer Sci

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“…In addition, according to the description of Bragg’s law, the interplanar spacings ( d ) of α 1 and α 2 are both significantly shifted, as listed in Table . With the increase of the 6F content, the d values of α 1 and α 2 decrease slightly, as aromatic ring increases the ability of π–π stacking between polymer chains, making the packing of the LMPA molecular chain more compact. − In contrast, with the introduction of the DA trace cross-linked networks in LMPA samples, the d values of α 1 and α 2 increased slightly as the polymer chain stacking possessed loose packing features and large void volumes caused by cross-linked networks …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Low-Melting-Point Polyamides with Trace Thermoreversible Cross-Linked Networks

Chen

Huang

Lee

et al. 2021

Ind. Eng. Chem. Res.

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In this study, we synthesized low-melting-point polyamides (LMPAs, T m ≈ 145 °C), which were composed of εcaprolactam, hexamethylenediamine, adipic acid, 1,10-decanedicarboxylic acid, and 2,5-furandicarboxylic acid. The LMPA materials with temperature-triggered reversible cross-linking were prepared by adding various bismaleimide (BMI) loadings (0, 0.1, 0.5, and 1.0 wt %), and their thermal and mechanical properties were obviously better than those of pure LMPA without BMI loading. According to rheological studies, the temperaturetriggered reversible cross-linking (i.e., Diels−Alder reaction) described above occurs at a temperature range of 150−160 °C. In addition, the rheological activation energy of LMPAs with crosslinked networks was significantly higher than that of LMPA without cross-linked networks (298.6 vs 77.7 J kg −1 K −1 , respectively). For mechanical properties, the yield strength of LMPAs with BMI loading (29.1−36.5 MPa) was higher than that of LMPA without BMI loading (19.1 MPa), which was improved by about 50%. As a method of developing LMPA materials with high performance, this is the first report of LMPA materials with temperaturetriggered reversible cross-linking.

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“…As an important branch in polymer science, functionalization of general polymers has attracted significant attention for their high added value and special applications. − A common pathway of synthesizing functionalized polymers is to chemically introduce functional units into their molecular chain via simultaneous or cascade approaches, − such as step-growth, 4, , free-radical, 5, and ring-opening ,, polymerizations. However, these methods are normally random for the distribution of functional units due to nonselective chemical binding.…”

Section: Introductionmentioning

confidence: 99%

“…However, these methods are normally random for the distribution of functional units due to nonselective chemical binding. Especially, for crystalline polymers, numerous functional unit introductions always destroy the regularity and symmetry of polymer chains, leading to crystallization-ability reduction or even disappearance. ,− Crystallization is a vital factor affecting many properties of polymers, such as stiffness, tensile strength, density, gas permeability, transparency, chemical resistance, etc. − Damage to crystallinity has in turn become the main barrier that restricts the actual application of these functionalized copolymers in many fields.…”

Section: Introductionmentioning

confidence: 99%

Targeted Copolymerization in Amorphous Regions for Constructing Crystallizable Functionalized Copolymers

Chen

Guo

et al. 2021

Macromolecules

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Heavily damaged or disappeared crystallizability caused by nonselective chemical binding of functional units is a universal and challenging issue for random functionalized copolymers. Herein, we propose a temperature-controlled targeted copolymerization that can selectively activate the amorphous region segments of polymers and directionally copolymerize the functional units into this region while retaining the regular segments and crystallizability of the original crystalline region. A flame-retardant functional monomer and typical semicrystalline polyester are chosen to verify our state-of-the-art targeted copolymerization approach. Compared with the corresponding random copolymers, the resulting microblock copolymers exhibit a much higher crystallinity and faster crystallization rate while keeping other functionalities. Even at a high functional unit content (16.7 mol %), targeted copolymerization can endow copolymers with good crystallinity, while the corresponding random copolymer is totally noncrystallizable. Hence, targeted copolymerization chemistry provides a pioneering opportunity to achieve functionalization and maximum retention of crystallization ability at the same time, allowing purposeful tailoring of macroscopic performance by precisely regulating the sequential distribution of microstructure units.

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Semi-aromatic copolyesters with high strength and fire safety via hydrogen bonds and π-π stacking

Cited by 73 publications

References 73 publications

Construction of strong non‐covalent interactions for preparation of flame‐retarded acrylic pressure‐sensitive adhesives with improved shear and peel strengths

Construction of strong non‐covalent interactions for preparation of flame‐retarded acrylic pressure‐sensitive adhesives with improved shear and peel strengths

Synthesis and Characterization of Low-Melting-Point Polyamides with Trace Thermoreversible Cross-Linked Networks

Targeted Copolymerization in Amorphous Regions for Constructing Crystallizable Functionalized Copolymers

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