Polymers
·
2018
·Vol. 10
·期 8
·872
·
IF 2.935
Yongxian Zhao,Chen Ma,Shijie Cheng,Wei Xu,Yuejuan Du,Yansong Bao,Zuojie Xiao
Maleic anhydride (MAH)–divinyl benzene (DVB) multi-monomer melt-grafting onto isotactic polybutene-1 (iPB-1) was carried out in a torque rheometer. The effects of dicumyl peroxide (DCP), MAH, and DVB concentrations, and temperature, on the reaction, were investigated. The optimized conditions were 170 °C, DVB/MAH = 4:6 (mass ratio). DVB as a comonomer enhanced the grafting degree (Gd) and grafting efficiency (Ge) of iPB-g-MAH better than styrene. The initiator DCP had little effect on Gd as its concentration over 0.2 phr, but the grafts’ melt flow rate (MFR) increased significantly, and relative molecular weight decreased remarkably with increased DCP concentration. With increasing Gd, the contact angle of grafts with water decreased, and there was a larger crystallization rate. The study of iPB-1 and iPB-g-MAH (Gd = 1.5%)-modified polyamide 6 (PA6) showed that iPB-g-MAH had an obviously toughening effect on PA6. With increasing iPB-g-MAH concentration, the blends of impact strength and elongation at break increased obviously, tensile strength decreased slightly, and MFR decreased prominently, which greatly slowed the processing degradation of PA6. The properties of iPB-1/PA6 blends deteriorated. Both DSC curves and SEM micrographs confirmed that PA6/iPB-g-MAH blends had much better compatibility than PA6/iPB. The reason was that the anhydride group in iPB-g-MAH reacted with amide group in PA6 to improve the compatibility between two phases, and iPB-g-MAH is an excellent modifier for PA6.Keywords:isotactic polybutene-1;maleic anhydride;divinyl benzene;polyamide 6;modification
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
Materials Today Communications
·
2021
·
IF 3.383
Yantong Long,Yongcheng Pan,Yongjun Xu,Yibin Yan
In this paper, a C8 perfluoroacrylate/polybutene-1 composite film was prepared by solution casting method. Analysis by FTIR, XRD and SEM shows that C8 perfluoroacrylate has been successfully and uniformly integrated into the matrix polybutene-1, and the crystal structure of the matrix polybutene-1 remains intact without any change. When the content of the filler is very low, local structural changes can occur, resulting in an increase in dielectric constant and breakdown field strength , and can reduce conduction losses at high frequencies. Therefore, at room temperature, when f = 1kHz and the filler content is 0.2wt%, the dielectric constant of the composite film ε = 12.81, which is nearly 620 % higher than that of the pure PB-1 film ( ε = 1.78), and the dielectric loss still remains in tan σ = 0.011, and the composite film storage performance as well as the most excellent U e = 8.65 J/cm 3 , which is 8.5 times the energy storage density of the pure PB-1 material ( U e = 1.02 J/cm 3 ). The composite materials in this work show excellent properties such as high dielectric constant, low dielectric loss, and high breakdown field strength, which are prospective in the application of capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 98
·95527-95534
·
IF 3.289
Wei Liu,Ruoyu Zhang,Miaoming Huang,Xia Dong,Wei Xu,Yubin Wang,Guo-Hua Hu,Jin Zhu
A series of thermoplastic poly(ester urethane)s (PUs) containing poly(butylene 1,4-cyclohexanedicarboxylate) (PBC) as a soft segment were prepared for shape memory materials via a two-step synthesis, with isophorone diisocyanate and 1,4-butanediol as its hard segments. The isomerization of the 1,4-cyclohexylene ring moiety (CHRM) happened during the preparation of PBC oligomers with molecular weight of 1700, 2300 and 3300 g mol−1, but such phenomenon was not observed during the reaction for the synthesis of PU. The three PBC oligomers could all crystallize, but their crystallization ability was depressed after incorporation of PUs. Thermo, thermo-mechanical and mechanical properties of the corresponding PUs were studied to understand their structural information. It was found that the PU containing PBC1700 was an elastomer at elevated temperatures, and its shape memory properties were evaluated by DMA procedures. Regardless of its low degree of micro-phase separation, it was very interesting to find that the shape recovery ability of such PU was excellent, which was in contrast to traditional findings.
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
Xiangyuan Meng,Huifang Ma,Yaping Ma,Chenguang Liu,Aihua He
High-temperature resistant shape memory polyolefins, which also exhibit resistances to creep and raw petroleum, are highly crucial for the pipelines in severe environments, like high temperature, high pressure and petroleum medium. Herein, a series of crosslinked polybutene-1 alloys (PBA-X) were firstly fabricated, which presented excellent high-temperature resistances to creep and raw petroleum at 85 °C, as well as outstanding shape memory behaviors like 93.7-100.0 % shape recovery ratio ( R r ), 90.6-98.4 % shape fixation ratio ( R f ), and easy recovered from varied programmed three-dimensional (3D) shapes through thermal stimulation. PBA-X are anticipated to offer significant potential as innovative pipeline lining materials for deep-ocean petroleum transportation systems.
研究领域:
材料科学
·
石油化工
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Yinan Yan,Bianying Wen
Using polymer-grafts to improve the interfacial compatibilization of composites is by far the most common and effective strategy. However, although polybutene-1 (PB) resin enjoys the reputation of “gold plastic” in the field of industry, there are few studies on its grafting and functional modification. In this work, PB-grafts were prepared by melt grafting method with maleic anhydride (MAH) and styrene (St) as the functional monomers. The effect of two PB-grafts (PB-g-MAH and PB-g-MAH-co-St) on the interfacial compatibilization of PB/GNP (Graphene nanosheet) thermally conductive composites was compared and the corresponding compatibilizing mechanism is discussed. Results indicate that PB-g-MAH-co-St has better compatibizing effect than that of PB-g-MAH because the cooperation of St with MAH enhanced the grafting degree of functional monomers on PB, and increased the surface energy of PB-g-MAH-co-St, which reduced the interface energy between PB and GNP and improved its interfacial adhesion. A better compatibilization effect has achieved when the compatibilizer and filler at the mass ratio of 1:4. Under this ratio, when the content of GNP is 30 wt%, the thermal conductivity and electrical conductivity of PB/GNP/ PB-g-MAH-co-St composite achieved 1.82 W·m −1 ·K −1 and 8.44 × 10 −8 S·cm −1 , which are 857.89% and 9 orders of magnitude higher than that of neat PB, respectively. Moreover, the composite has good mechanical properties and processability, which is beneficial to industrialization. Highlights PB-g-MAH-co-St has higher grafting ratio than that of PB-g-MAH. The surface energy of PB/GNP composites is reduced by use of PB-g-MAH-co-St. There is a suitable mass ratio between compatibilizer and filler. The composite of PB/GNP/PB-g-MAH-co-St achieved high thermal conductivity. The PB/GNP/PB-g-MAH-co-St composites have good melting processability.
研究领域:
材料科学
·
高分子科学
·
复合材料
✓ 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）