INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jianbin Mo,Junjie Lei,Haixu Wang,Qingpeng Kang,Weifeng Liu,Xueqing Qiu
The characteristics of multi-hydroxyl structure and strong hydrogen bonding in polyvinyl alcohol (PVA) make its melting point close to its decomposition temperature, causing melt-processing difficulty. In this work, following the plasticization of small-molecule primary plasticizer acetamide, lignin was demonstrated as a green secondary plasticizer in realizing the melt processing and simultaneous reinforcement of PVA. During the plasticization process, lignin was able to combine with the hydroxyl groups of PVA, so as to destroy the hydrogen bonds and regularity of the PVA chains. The synergistic plasticization effect of lignin dramatically reduced the melting point of PVA from 185 °C to 151 °C. The thermal processing window of PVA composites was expanded from 50 °C to roughly 80 °C after introducing lignin. In contrast to acetamide, the addition of lignin significantly increased the tensile strength and Young's modulus of the composites to 71 MPa and 1.34 GPa, respectively. Meanwhile, lignin helped to hinder the migration of acetamide via hydrogen bonds. With the addition of lignin, the composites also displayed enhanced hydrophobicity and excellent UV shielding performance. The strategy of synergistic plasticization of lignin provides a feasible basis for the practical application of lignin in melt-processable PVA materials with good comprehensive properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2017
·Vol. 9
·期 9
·420
·
IF 3.364
Hongfei Zhang,Wei Wang,Guofei Chen,Anjiang Zhang,Xingzhong Fang
It is a great challenge to develop semicrystalline polyimides exhibited significant recrystallization ability and fast crystallization kinetics from the melt. A series of semicrystalline polyimides based on 1,4-bis(3,4-dicarboxyphenoxy)benzene dianhydride (HQDPA) and different diamines, including 1,3-bis(4-aminophenoxy)benzene (TPER), 1,4-bis(4-aminophenoxy)benzene (TPEQ), 4,4′-oxydianiline (4,4′-ODA) and 4,4′-bis(4-aminophenoxy)biphenyl (BAPB), end capped with phthalic anhydride were synthesized. Crystallization and melting behaviors were investigated by differential scanning calorimetry (DSC). The polyimide derived from HQDPA/TPER (PI-1) exhibited a glass transition temperature (Tg) at 190 °C and double melting temperatures (Tms) at 331 °C and 350 °C, and the polyimide derived from HQDPA/TPEQ (PI-2) displayed aTgat 214 °C and aTmat 388 °C. PI-1 and PI-2 showed significant recrystallization ability from melt and high crystallization rate by isothermal crystallization kinetics study, while polyimides based on 4,4′-ODA and BAPB lost crystallizability once taken to the melt. These polyimides also exhibited excellent thermo-oxidative stability with 5% weight loss temperature higher than 500 °C and good mechanical properties with tensile moduli of 2.0–3.3 GPa, tensile strengths of 85–105 MPa and elongations at break of 5–18%. PI-1 also possessed outstanding melt flowability with less than 300 Pa·s around 370 °C by rheological measurements.Keywords:semicrystalline polyimide;melt-processable;crystallization kinetics;thermal stability
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
Nano Energy
·
2019
·
IF 15.548
Lijun Yang,Shuai Chi,Shunping Dong,Fen Yuan,Zhaoding Wang,Jingxin Lei,Lixia Bao,Jun Xiang,Jiliang Wang
The quasistatic piezoelectric coefficient ( d 33 ) of the state-of-the-art bulk polymers is lower than 38 pC N −1 , extremely restricting their application in the fields of next generation of smart and wearable devices . Herein, a novel soluble and meltable piezoelectric bulk copolyimide with the d 33 of about 420 pC N −1 has been successfully synthesized by co-polymerizing pyromellitic dianhydride with p-phenylenediamine and the specially designed NH 2 -ended imidazole ionic liquid . Molecular structure, solubility, melt processability , and piezoelectricity of the resulting piezoelectric copolyimide have been extensively investigated. Relevant results reveal that the d 33 value of the obtained piezoelectric copolyimide is found to be 10 and 50–100 times higher than the reported bulk poly (vinylidene fluoride) and polyimides , respectively. It still surpasses 250 pC N −1 as the storage temperature approaches 150 °C, evidently higher than that of the previously reported polymer based piezoelectric materials . The developed copolyimide shows outstanding piezoelectricity reliability, benefiting from the semicrystallinity of the resulting copolyimide at room temperature. A maximum output voltage of about 219 mV can be instantaneously obtained once a tiny periodical force is loaded on the copolyimide based piezoelectric nanogenerator (PENG). Meanwhile, an output power of about 1.17 mW can be reached for the developed PENG, implying large potential application in the sectors of smart tactile devices, electronic skins, and self-powered biomedical nanorobots etc.
研究领域:
材料科学
·
纳米技术
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Xiao-Rong Sun,Zhi-Qiang Cao,Rui-Ying Bao,Zhengying Liu,Bang-Hu Xie,Ming-Bo Yang,Wei Yang
A facile and green route to fabricate sustainable and biodegradable tridimensional interconnected hierarchically meso- and macroporous polylactide (PLA) monoliths was developed. The tunable morphologies and controllable pore sizes of the monoliths based on the stereocomplex (sc) crystallization of poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) during the melt blending process were caused by the macro- and microphase separation between PLA and poly(ethylene oxide) (PEO). The proposed approach can be easily scaled-up and is environmentally sustainable, and it involves neither any toxic chemical reagents nor templates. The hierarchical morphologies of the porous materials contain mesopores regulated by the sc crystallite network formed during melt processing and macropores induced by macrophase separation. The porous structure was influenced by PDLA contents seriously, and the construction of interconnected pores made up of sc crystallite tridimensional network appears at a low PEO content of 20 wt %. The porous polymer monolith featured very good hydrophobicity with a water contact angle over 135°, as well as the strong lipophilicity, endowing the materials with potential applications in selective oil–water separation. Moreover, the much higher thermal and chemical resistance of the porous PLA monoliths based on sc crystallite network allowed us to significantly broaden the applications of the adsorbent in some harsh conditions and catalytic systems compared to those based solely on PLLA.
研究领域:
材料科学
·
环境科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2025
·
IF 6
Chang Yu,Yang Wang,Bo Jiang,Yang Yang,Jinxuan Han,Haibo Zhang,Yingshuang Shang
The rapid development in high-frequency communication has raised the demand for intrinsic low dielectric materials. Fluorinated poly(aryl ether)s (FPAEs) have gained significant attention due to their excellent dielectric properties and heat resistance. However, current methods for preparing FPAE films involve organic solvents, which generate substantial waste during large-scale production. There is an urgent need for simpler and more efficient processing methods, such as injection molding or melt processing, to overcome the limitations of solvent-based approaches. In this study, FPAEs with different molecular weights were synthesized from decafluorobiphenyl (DFBP) and bisphenol AF. The melting index and rheological tests demonstrated that FPAEs exhibited good thermal stability and melt processing performance. Notably, the dielectric loss (D f ) of FPAEs prepared by melt processing was significantly reduced (below 0.001) while their dielectric constant (D k ), mechanical strength, and flexibility remained comparable to those of FPAEs produced using solution processing. This study advances the melt processing of FPAEs with perfluorinated biphenyl groups, providing insights for large-scale production of low dielectric materials and broadening their potential applications in high-frequency communication.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 7
·2312-2321
·
IF 3.4
Peng Cai,Hefeng Zhang,Yifu Huang
Organic long afterglow materials can be incorporated into commercial polar polymer in very small amount to significantly reduce cost for application, while gaining excellent mechanical deformability attractively. Their luminescence can be usually enhanced, as the polar polymer can block oxygen diffusion and inhibit inclusion aggregation. However, due to thermal instability of most afterglow materials at high temperature, it is still a great challenge when they are applied for widely used polymer melt in material industry. Herein we report a new afterglow material of doped polymer system by blending a new luminescent, two-dimensional polyamide sheet (TIB-3CPBA-TAPA) with a high-temperature polyamide 6 (γPA6) melt. The excellent thermal stability of TIB-3CPBA-TAPA results from the amide bond-linked, imidazolium salted and conjugated structure. Interestingly, TIB-3CPBA-TAPA/γPA6 is found to emit greenish afterglow luminescence that can last for 4 s at room temperature, only under a loading of 0.1 wt% that harvests the UV exposure efficiently. Different from converting non-afterglow γ crystal (γPA) into afterglow α crystal (αPA), our facile strategy achieves longer afterglow with a higher melting point (220°C) and a tripled quantum yield (1.8%). In addition, the viscoelasticity of the polymer melt is improved by TIB-3CPBA-TAPA with a mechanical toughening effect.
研究领域:
材料科学
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高分子化学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Peng Wei,Longlong Li,Li Wang,Jinfei Yan,Jiahao Li,Caihong Chen,Yifeng Zhang
In this study, a series of high-performance biobased liquid crystal copolyesters derived from 6-hydroxy-2-naphthoic acid (HNA), 4, 4ʹ-Dihydroxybiphenyl (BP), biobased 2,5-furandicarboxylic acid (FDCA) and sebacic acid (SeA) were successfully designed and prepared via “one-pot” melt polycondensation method. The addition of nonlinear and rigid FDCA units broke the regularity of the molecular chain but increased the chain rigidity, thus, endowing the unique thermal behavior, which the melting temperature decreased from 163.0 to 125.3 ℃, while the glass transition temperature decreased first and then increased slightly to 75.7 ℃ as increased the FDCA units to 7.5 mol%. Furthermore, DSC and XRD results showed that a small amount (1 mol%) of FDCA units did not impair crystallization ability of the copolyesters, whereas excess of FDCA hindered the molecular chain packing. The DMA results also demonstrated that the addition of FDCA restricts the chain motion and improves the rigidity of the copolyester as reflected by the higher storage modulus. The incorporation of nonlinear FDCA units lowered the initial degradation temperature slightly, but still exhibited enough thermal stability to be melt processed as compared with its relative low melting temperatures. The copolyesters exhibited a broad temperature range of nematic liquid crystal phase as well as shear thinning and viscous melt flow behavior, which were beneficial for its melt processing. The tensile strength and modulus of the injection molded splines were in range of 82.51–103.27 MPa and 2.05–2.72 GPa, respectively, which were much higher than the common biobased copolyesters such as PLA, PCL and other FDCA-containing polyesters. The increased modulus and decreased fracture strain of the copolyesters containing FDCA units further verified the high rigidity of the molecular chain. Moreover, the in-vitro cytotoxicity and water contact angle results proved that the copolyesters have good biocompatibility. The resulted copolyesters combined with excellent melt processing ability, mechanical property and good biocompatibility have great promising applications as biomedical and biodegradable materials.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 12
·1-12
·
IF 1.53
Jiao Yang,Chen Guofei,Zhou Haijun,Zhang Feng,Chen Xiaoqi,Li Yantao,Xiao Xueshan,Fang Xingzhong
A series of poly(benzimidazole-imide)s (PBIPIs) derived from different dianhydrides and 2-(3-aminophenyl)-5-aminobenzimidazole ( m -BIA) were synthesized via thermal imidization to form flexible films. This series of PBIPIs showed great T g s ranging from 296 to 484 °C, excellent thermal stability performed in 5% weight loss temperatures ( T d5% s) of 502–529 °C in N 2 and good mechanical properties (tensile strengths of 89–127 MPa, tensile moduli of 2.9–4.1 GPa and elongations at break of 3.9–6.9%). Compared with PIs derived from 6-amino-2-(4-(4-aminophenoxy)phenyl)-1H-benzimidazole ( p -BIODA), m -BIA based PBIPI films exhibited higher T g , and better solubility. Besides, the thermoplastic PBIPI resin (PI-6-PA) derived from 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) and m -BIA exhibited good melt processability with high T g of 273 °C, melt flow index (MFI) of 7.76 g/10 min, minimum complex viscosity of 11.9 × 10 3 Pa·s at 402 °C and low melt viscosity ratio of 2.46 at 400 °C.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 5
·e70202
·
IF 3.4
Chaoxin Wang,Qi Wang,Yongliang Wang,Peigang He,Zhidong Han
The developing trends of electrical and electronic devices in high-power operation, densified installation, and structural miniaturization challenge the application of the composites with efficient thermal conductivity. In view of the manufacture technology of polyolefin materials, the melt-processing strategy was designed to prepare the thermally conductive composites based on polypropylene/polyolefin elastomer (PP/POE) blend with hexagonal boron nitride (hBN) and alumina oxide (Al 2 O 3 ). By filling hBN and Al 2 O 3 separately into the co-continuous PP/POE blend, the selectively distributed structure with hBN in the PP phase and Al 2 O 3 in the POE phase was revealed, and the thermal conductivity of the composites was improved with selective filler distribution. The processing scheme exerted distinct influences on the distribution structure and the thermal conductivity of the composites with the same filler content. A superior thermal conductivity of 0.80 W/(m K) was achieved with the individually distributed structure of BN and Al 2 O 3 together with the bridged interaction between PP/BN and POE/Al 2 O 3 phases. The reduction in interfacial thermal resistance contributed to the enhanced thermal conductivity according to the simulation with finite element analysis (FEA). The proposed strategy provides an efficient way to mass manufacture thermally conductive polypropylene composites.
研究领域:
材料科学
·
高分子材料工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Yuan Cao,Min Zhi Rong,Ming Qiu Zhang
To tackle the challenge of manufacturing highly filled composite materials via melt compounding and injection molding , the authors proposed a novel approach based on Diels-Alder (DA) chemistry. Polycaprolactone oligomers (PCL olig , M w = 2000 g/mol) were firstly crosslinked by DA bonds, and then the resultant network PCL olig -DA was also connected to maleimide functionalized Al 2 O 3 particles (Al 2 O 3 -M) via DA bonds. Upon being heated to the retro-DA reaction temperature, the covalent adaptable composite network exhibited low viscosity due to de-crosslinking, enabling melt processing and well dispersion of high-concentration fillers. During the subsequent cooling, the composite network was regained because of DA reaction, benefiting increase of the composite’s strength . Consequently, the contradictory requirements for molecular weight of matrix polymer under the circumstances, which had better to be as low as possible during the manufacturing but as high as possible in the ultimate composites, were skillfully satisfied.
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
POLYMER
·
2025
·
IF 4.5
Guifa Xu,Jun Wang
The recycling of thermosetting silicone rubber has seen significant advancements through the elaborate design of molecular structures. However, challenges persist in achieving effective recycling via industrially viable methods. In this work, we developed high-performance and recyclable silicone rubber, specifically polymethylvinylsiloxane (PMVS)-based vitrimers (PBVs), using melt processing. Dual-crosslinking interactions were constructed between PBVs and silica nanoparticles, combining dynamic covalent boronic ester bonds and hydrogen bonds. The PBVs exhibited high mechanical performances with tensile strength ( σ ) up to 3.65 MPa, elongation at break ( ε ) up to 1350 %, and tensile toughness ( U T ) up to 25.11 MJ/m 3 , superior to those reported silicone rubber vitrimers. Furthermore, the presence of boronic ester bonds enabled efficient thermal reprocessability, attributed to the low activation energy of dynamic bond exchange, which ranged from 13.51 to 27.64 kJ/mol for the samples examined. The material demonstrated the ability to undergo multiple reprocessing cycles with minimal loss of performance, maintaining σ of 3.49 MPa, ε of 850 % and U T of 12.88 MJ/m 3 after three times of reprocessing. By simultaneously enhancing the mechanical properties and recyclability of silicone rubber using an industrially scalable technique, the work offered a promising pathway for real-world recycling of thermosetting rubber materials.
✓ 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
危险品化学品经营许可证（带存储）