Journal of Materials Chemistry C
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2025
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IF 5.1
Panpan Yang,Yifei Wu,Kunxin Wang,Sheng Lu,Yuemiao Zhang,Junxi Wan,Kun Wu,Jun Shi
In order to investigate the influence of intermolecular interactions on polymer crystallization, a series of liquid crystal polyesters with high thermal conductivity (B-LCPs) were synthesized. These were synthesized using biphenyl diols and various dicarboxylic acids as raw materials, employing a “one pot” melt polycondensation method. The λ value of B-LCP4 reaches 0.462 W (m K)−1, marking an enhancement of 135.8% in comparison to that of B-LCP3, which is 2.3 times greater than that of traditional thermoplastics. The diffraction peak of B-LCP4 at 2θ = 27.4° indicates the formation of a π–π stacking structure and crystallinity around 58%. B-LCP4 exhibited significant melting peaks and weak cold crystallization during the second heating scan, which indicates the crystal phase becomes more integrated and regular. Furthermore, the T5%, Tmax and residual carbon at 800 °C of B-LCP4 were 387.7 °C, 422.2 °C and 15.4%, respectively. The augmented thermal stability of B-LCP4 is ascribed to the delocalization of π-electrons along the backbone, which facilitates a planar conformation. The findings indicate that the π–π stacking interaction can enhance the crystallinity of polymers, subsequently improving their thermal conductivity.
研究领域:
材料科学
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高分子化学
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高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 13
·3306-3314
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IF 5.256
Hai-Yi Zhong,Li Chen,Rong Yang,Zhi-Ying Meng,Xiao-Min Ding,Xiao-Feng Liu,Yu-Zhong Wang
An azobenzene-containing thermotropic liquid crystalline polyester showing unique thermo- and photo-responsive behaviours was synthesized by polycondensation from mesogenic dial 4,4′-bis(6-hydroxyhexyloxy)azobenzene (BHHAB) with 2-phenylsuccinic acid (PSA), and named as poly(4,4′-bis(6-hydroxyhexyloxy)azobenzene phenylsuccinate) (PBHPS). Liquid crystalline behaviours were investigated through differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and wide-angle X-ray diffraction (WAXD). PBHPS showed a smectic phase with strong π–π interactions between the adjacent phenyl rings or between the side group and mesogenic unit, which could be regarded as physical crosslinking points that made PBHPS have good shape memory and self-healing properties. A series of PBHPS/methylcellulose bilayer films were prepared to study the reversible photo-mechanical properties. UV-vis absorption spectra were used to study the reversible photo-responsive behaviour of the polyester, proving that the reversible photoisomerization-induced volume expansion of the PBHPS layer resulted in good reversible photo-responsive properties.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Qiannan Cheng,Tao Peng,Jie Li,Lijie Liu,Qingquan Tang,Luoxin Wang,Hua Wang,Jiang Gong
With the rapid popularity of liquid crystal polyesters (LCPs) in 5G chip packaging materials, a large amount of waste LCPs were produced. However, the recycling and reutilization of waste LCPs are rarely investigated so far. Herein, the waste LCPs are calcinated by “controlled carbonization” strategy to produce microporous carbons, showing potential in producing freshwater and electricity based on solar-irradiated photothermal conversion. ZnCl 2 /NaCl eutectic salts were used to catalyze the dehydration and decarboxylation of LCPs to form aromatic fragments and then construct microporous carbon skeletons. The resultant carbons show high specific surface areas and solar absorption efficiency. They were used to prepare interfacial solar steam evaporators, showing a high evaporation rate of 2.17 kg/m 2 /h with the energy conversion efficiency of 97.5 % and a high electricity generation with an output power of 0.902 W/m 2 under 1 sun irradiation. This work not only provides a feasible approach to the sustainable conversion of low-cost waste LCPs into valuable carbon materials by a “controlled carbonization” strategy, but also gives impetus to the potential of microporous carbons for application in solar freshwater and electricity generation.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 69
·期 4
·346-354
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IF 2.433
Weilong Chen,Kun Wu,Zhiyou Tan,Mangeng Lu
Interfacial thermal resistance between matrix and filler is one of the most serious factors hindering heat transfer in composites. Here, a type of liquid crystalline polyester (LCP) containing phenyl pendant groups was intended to blend with pristine graphite by interfacial interaction. The intensity at 26.6° of the wide angle X-ray diffraction pattern which exceeded that of pristine graphite indicated the existence of a strong interfacial π–π interaction. Both DSC and XRD tests showed that the ordered structure of the LCP matrix is directly affected by the mass fraction of graphite, indicating the interfacial interaction between LCP and graphite. By increasing the content of graphite, the thermal diffusivity showed a sharp increment by 1004%. The maximum thermal conductivity of the composite reached 28.613 W m −1 K −1 , which was seven times that of traditional thermoplastic blended with graphite. Compared with the data calculated using effective medium theory, interfacial interaction plays a significant role in enhancing the thermal conductivity of the composites. Furthermore, the maximum tensile strength of this series of composites reached 13.3 MPa and the maximum Young's modulus reached 1067 MPa, exhibiting a potential guideline for further applications in flexible electronics. © 2019 Society of Chemical Industry
研究领域:
材料科学
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热工程
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聚合物科学
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复合材料
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Zhenjie Ding,Li Yuan,Ting Huang,Guozheng Liang,Aijuan Gu
High thermal transition temperature, good processing feature, and full recovery of two temporary shapes are three necessary properties of triple-shape memory polymers (Tri-SMPs) for cutting-edge fields such as aerospace deployable structures, high temperature sensors, and actuators; however, it is still an interesting project with great challenges to prepare these functional polymers. Herein, without using solvent and high curing temperature (>300 °C), a new kind of thermally resistant Tri-SMP (LCPEI-EPEA) with two distinct glass transition temperatures (Tg = 93 and 218 °C) and 100% shape recovery ratios of two recovery processes was developed, which was prepared through building cross-linked networks based on acetylene terminated all-aromatic liquid crystalline poly(ester imide) (LCPEI) and reactive epoxy oligomer with acetylene side groups (EPEA). The relationship between cross-linked structures and integrated properties is intensively discussed. Unique copolymer molecular structures and chemical cross-linked points endow LCPEI-EPEA with excellent triple-shape memory performance. The obvious advantages of high thermal transition temperature and good processing property make the preparation of LCPEI-EPEA highly competitive with that of other advanced polymers with triple-shape memory effects.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
POLYMER BULLETIN
·
2016
·Vol. 74
·期 5
·1611-1627
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IF 1.371
Song Laifu,Lu Shaorong,Xiao Xiane,Qi Bo,He Zihai,Xu Xu,Rao Baolin,Yu Jinhong
Epoxy composites with biphenyl liquid crystalline polyester (BLCP)-grafted graphene oxides (GO) as inclusions were prepared successfully. The thermal and texture analyses of BLCP were characterized by DSC and POM. The results show that the texture structure of BLCP turned into fan texture from woven texture with increasing temperature and present double texture structure. More importantly, the thermal and mechanical properties of epoxy composites could be improved by incorporating BLCP-grafted GO (BLCP-GO). The epoxy composite with only 0.5 wt% BLCP-GO produced an increase in the initial decomposition temperature ( T
d ) by 28 °C and glass transition temperature ( T
g ) by 17.2 °C when compared with the neat epoxy. Moreover, for the mechanical properties tests, the composites with 1.0 wt% BLCP-GO exhibit an increase in impact strength, tensile strength, flexural strength and flexural modulus by 103, 52, 66, and 56 %, respectively, compared with the neat epoxy resin. These excellent performances of the graphene–epoxy composites have a great potential for applications in aerospace and other electrical devices.
研究领域:
材料科学
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复合材料
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热工程
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机械工程
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产品关联
DOI
高影响因子
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