JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52219
·
IF 3.057
Yongyin Cui,Hongwei Pan,Changrui Shi,Huichao Zhuang,Qingfu Wang,Chengzhong Zong
To simplify the production process of thermoplastic polyurethane (TPU)/methyl vinyl silicone rubber (VMQ)-based thermoplastic vulcanizate (TPV), a series of block TPUs with different hydroxybutanyl terminated polydimethylsiloxane (PDMS) content were used as the matrix to increase the essential compatibility. The impact of microstructure and macroscopic properties was explored. PMDS promoted the microphase separation of TPU, which increased the essential compatibility in TPVs. The essential compatibilization effect of PDMS made the tensile strength retention proportion of TPV relative to the raw material TPU at 40%, but the elongation at break could reach 192%, which had an excellent toughening effect. Moreover, PDMS made the limiting oxygen index of TPV-323 reach 27%. The analysis of the carbon layer proved that the Si element formed a silicon oxycarbon layer with excellent flame retardancy on the surface.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Ziwen Cui,Xiangyu Li,Wei Feng,Liping Wei,Yingjun Liu,Aihua Du
This work aims to develop heat- and oil-resistant thermoplastic vulcanizates (TPVs) based on hydrogenated acrylonitrile butadiene rubber (HNBR) and thermoplastic polyester elastomer (TPEE) using dynamic vulcanization and following a masterbatch procedure. It focuses on the effect of the cross-linking agent dosage on the morphology and properties of HNBR/TPEE-TPVs. An increase in the peroxide dosage yields a higher cross-linking degree of the HNBR, a smaller size and a more uniform distribution of the HNBR domains, and a stronger rubber network. Consequently, the elasticity and high-temperature oil resistance of the TPV increases, but its flowability in the molten state, tensile properties , and heat resistance decrease. It turns out that a peroxide dosage of 1.5 phr is preferred for the preparation of HNBR/TPEE-TPV under the specified processing conditions to achieve a more comprehensive TPV performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
De-Fa Hou,Meng-Lei Li,Pei-Yao Li,Ling Zhou,Kai Zhang,Zheng-Ying Liu,Wei Yang,Ming-Bo Yang
Despite the melting processibility of cellulose is of great importance to convert this abundant biomass to various products, the efficient and sustainable preparation of a thermoplastic cellulose material remains a challenge. Herein, we report a novel one-step ball-milling mechanochemistry method for efficiently converting cellulose to melt-processable cellulose stearates (SCEs) without sacrificing excess reagents. By adjusting the reaction conditions, a series of SCEs with degrees of substitution (DS) ranging from 1.30 to 2.37 are synthesized. Besides, the relationship between DS and the thermoplasticity of SCEs is well investigated. The obtained SCEs with DS beyond 1.62 show favorable thermoplasticity, which can be processed into homogeneous films with a maximum tensile strength of 12.4 MPa and an elastic modulus of 353.6 MPa by a conventional hot-pressing technique (160 °C, 10 MPa). Moreover, this method is universally used for achieving various thermoplastic fatty acid cellulose esters with different numbers of carbons (10–18) in side chains. Due to its high efficiency and sustainability, this approach holds great potential for the large-scale fabrication of thermoplastic cellulose-based materials.
研究领域:
材料科学
·
化学工程
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 7
·1142
·
IF 5.719
Mei Wan,Congling Shi,Xiaodong Qian,Yueping Qin,Jingyun Jing,Honglei Che
In this work, a novel functionalization strategy for ZIF-67-modified layered MXene was proposed, aiming at improving the fire safety of thermoplastic polyurethanes (TPU). The ZIF-67@MXene was verified by microscopic morphology, elemental composition, functional group species and crystal structure, and then the successfully prepared ZIF-67@MXene was introduced into the TPU material. When ZIF-67@MXene content was only 0.5 wt%, the peak heat release rate, total heat release rate, peak smoke release rate, total smoke release rate, and CO yield of the TPU/ZIF-67@MXene composites were reduced by 26%, 9%, 50%, and 22%, respectively, compared with the pure TPU. The thermogravimetric tests showed that the residual char of TPU/ZIF-67@MXene composites was the most in all samples. In short, the high-quality carbon layer of TPU/ZIF-67@MXene composites acts as a physical barrier to the transfer of heat and toxic gases, greatly improving the flame retardant properties of the TPU polymer.Keywords:metal-organic framework ZIF-67;MXene;fire safety;thermoplastic polyurethanes
研究领域:
材料科学
·
高分子科学
·
防火工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Bo Lei,Yanhong Feng
Thermoplastic bio-based materials from lignocellulosic fibers are of great importance in a sustainable society. To enhance their preparation to an industrial scale, a facile strategy is proposed that combines continuous steam explosion (CSE) with periodate oxidation/borohydride reduction to modify sisal fibers . In the CSE pretreatment , the aldehyde content of oxidized products was increased by a maximum of ∼17%, and the yield of oxidized/reduced products was increased by a maximum of 25%. Furthermore, the tensile strength of hot-pressed sheets was increased to 42.2 MPa, representing a 175% improvement compared with sheets without CSE pretreatment, and a decreased glass transition temperature of ∼132 °C. Results indicated that CSE pretreatment was favorable for improving the modification efficiency and uniformity of sisal fibers, simultaneously achieving much better mechanical properties and thermoplasticity . Appropriate oxidation level of sisal fibers also achieved the better performances. The combined strategy was facile and scalable, and might significantly impact the widespread preparation and utilization of thermoplastic bio-based materials.
研究领域:
材料科学
·
生物质能
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 48
·
IF 1.768
Fei Zhao,Han-Xiong Huang,Shui-Dong Zhang
This work focuses on largely toughening poly(lactic acid)/thermoplastic polyurethane (PLA/TPU) blend with lower content (20 wt %) of TPU using appropriate contents of 4,4-methylene diphenyl diisocyanate (MDI) via simple melt blending. Both scanning electron micrographs and differential scanning calorimetry curves suggest little change of the compatibility between the PLA and TPU phases by adding the MDI. Dynamic rheological test demonstrates that a reaction occurs between the TPU phase and MDI during melt blending. Combining the rheological behaviors and gel contents of the blends, it can be speculated that adding the MDI extends the TPU chains and forms branched and crosslinked structure in the TPU chains sequentially. Toughening mechanism is analyzed and different impact strengths for the blends with different MDI contents are explained based on combined effects of the decreased crystallinities for the PLA matrix and the extended, branched and crosslinked structure in the TPU chains. A 0.8 wt % MDI content is optimal in terms of the impact strength (100.6 kJ/m 2 ) and the elongation at break (392.4%). The former is about 1.9 and 32.5 times of that for the blend without MDI and the PLA, respectively. Moreover, the MDI results in some increase in the tensile strength of the blends. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42511.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 8
·1530
·
IF 4.967
Hui Fang,Lingjie Zhang,Anlin Chen,Fangjuan Wu
Polylactic acid (PLA)-thermoplastic polyurethane (TPU) copolymer (PTC) was prepared by melting TPU pellets in molten lactide, followed by in situ ring-opening coordination polymerization. The results from FTIR and1H-NMR confirmed the formation of the copolymer. PLA/TPU blends with different TPU contents were prepared by melt blending method. SEM and mechanical properties showed a conspicuous phase separation between PLA and TPU. In order to further improve the mechanical properties of the blend, PTC was used as the compatibilizer and the effects of the PTC content on the properties of the blend were investigated. The addition of PTC made TPU particles smaller in PLA matrix and improved the compatibility. With the loading of 5 wt.% PTC, the impact strength of the PLA/TPU blend reached 27.8 kJ/m2, which was 31.1% and 68.5% higher than that of the blend without PTC and pure PLA, respectively. As the content of PTC was more than 5 wt.%, the mechanical properties declined since the compatibilizer tended to form separate clusters, which could reduce the part distributed between the dispersed phase and the matrix, leading to a reduction in the compatibility of the blend. Moreover, the DMA results confirmed PTC could improve the compatibility between PLA and TPU.Keywords:polylactic acid;thermoplastic polyurethane;in situ polymerization;compatibility
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 7
·2374-2385
·
IF 3.348
Qinyong Liu,Huawei Wang,Hefu Li,Jun Sun,Xiaoyu Gu,Sheng Zhang
To enhance the flame retardancy and smoke suppression of thermoplastic polyurethane (TPU), a novel flame retardant ZIF-67@GO was fabricated by hybridization of zeolitic imidazolate framework-67 (ZIF-67) and graphene oxide (GO). The flame retardancy of TPU sample was significantly enhanced by the presence of 6.5 wt% ammonium polyphosphate (APP) and 0.5 wt% ZIF-67@GO: the limit oxygen index (LOI) reached 27.4% and UL-94 grade passed V-0, the peak heat release rate (pHRR) and peak smoke production rate (pSPR) values was dropped by 81.2% and 48.7%, respectively, comparing with that of the control sample. The burning time of the flame-retardant TPU sample was prolonged to more than 600 s from 200 s of the control TPU sample during the cone test. Additionally, the tensile strength and elongation ratio of the flame-retardant TPU reached 18.3 MPa and 1026.3%, respectively, which meet the requirement in most industrial applications. This work provides useful information to produce flame retardant synergists for polymeric composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zhuanzhuan Shi,Xiaoshuai Wu,Yao Lu,Zhisong Lu,Chang Ming Li,Ling Yu
In this work, cohesive thermoplastic-assisted patterning was successfully used to fabricate versatile 2D and 3D electrodes for biosensing application. The cohesive thermoplastic template was fabricated by cutter shaping to remove wet-chemical processes and UV-lithography. This low cost approach is compatible with versatile inks and substrates. Both single and multi-step grafting of inks work well with cohesive thermoplastic templates to form electronic units on substrates. Other than work on a 2D flat substrate, the cohesive thermoplastic origami can easily fabricate electrodes on 3D objects, demonstrating itself as a good candidate to implant electronic unit on a stereotype object. The flexibility, convenience and operability seen here make this method a fast prototype method to evaluate the proof-of-concept design. It also provides alternative fabrication solutions for researchers from resource-limited laboratories to work on miniaturized devices.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Mei Wan,Congling Shi,Xiaodong Qian,Yueping Qin,Jingyun Jing,Honglei Che,Fei Ren,Jian Li,Bin Yu
In this study, three-dimensional flower-like Ni-MOFs were fabricated and successfully functionalized on multi-terminal lamellar MXene (Ti 3 C 2 T x ) by solvothermal method, and their flame retardant application in thermoplastic polyurethanes (TPU) was investigated. As expected, the addition of Ni-MOF@Ti 3 C 2 T x can improve the flame retardancy and smoke suppression properties of TPU. The heat release rate, the smoke release rate, total smoke production, CO and CO 2 release of the composite with only 1 wt% MOF@Ti 3 C 2 T x were significantly reduced by 15%, 44%, 26%, 18%, and 8%, respectively. Furthermore, the carbon residues of TPU/Ni-MOF@Ti 3 C 2 T x composites were about 2–5 times that of pure TPU, indicating that the Ni-MOF@Ti 3 C 2 T x can inhibit the thermal degradation of TPU. The mechanism illustrated that the excellent fire safety properties of TPU/Ni-MOF@Ti 3 C 2 T x composites are due to the physical barrier, catalytical carbonization, and gas-phase flame retardant of Ni-MOF@Ti 3 C 2 T x . In this work, the dispersity, thermal stability, and flame retardancy of MXene were improved due to the modification of MXene with Ni-MOF by chemical bonding and physical adsorption, which can broaden the range of applications of MOFs .
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·
IF 1.289
Panfang Lu,Min Zhang,Yong Liu,Jiuling Li,Ming Xin
The thermoplastic starch–vermiculite (VER) composite films were prepared by solution-casting technique in this study. First, the VER was used as the filler reinforcement for thermoplastic starch to enhance its properties. The modification of VER and the structure of films were investigated and characterized by X-ray diffraction and scanning electron microscope technology. Moreover, the Fourier transform infrared spectra confirmed that the VER particles formed strong hydrogen bond interactions with starch matrix. According to TGA, differential scanning calorimetry study, and water absorption testing, the starch–VER composite films exhibited better improvement properties than did the starch matrix. It provides information on the use of VER to reinforce the properties of starch-based materials. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
研究领域:
材料科学
·
生物材料
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
De-Fa Hou,Zheng-Ying Liu,Ling Zhou,Huang Tan,Wei Yang,Ming-Bo Yang
Cellulose is an abundant feedstock with renewability and biodegradability . However, it is still challenging to manufacture natural cellulose products by environmentally friendly thermoplastic processing methods. Herein, we proposed a green approach for the heterogeneous preparation of thermoplastic cellulose grafted polyurethane (RCP-g-PU) from amorphous regenerated cellulose paste (RCP) via hydroxyl/isocyanate chemistry. First, amorphous RCP was fabricated through dissolving cellulose in sodium hydroxide aqueous solution and regenerating in polyethylene glycol, resulting in the enhancement of the accessibility of hydroxy groups in cellulose chains. Subsequently, a series of thermoplastic RCP-g-PU with the melt flow temperatures ranging from 160 °C to 226 °C were feasibly synthesized by adding hexamethylene diisocyanate into RCP without using other organic solvents . Eventually, the resultant RCP-g-PU can be directly hot-pressed into transparent films with flexibility and foldability. The reported methodology represents a sustainable route to achieve thermoplastic cellulose derivatives .
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）