JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 13
·46052
·
IF 1.86
Cong Jia,Xiao Zhang,Yufeng Li,Yanghui Jiang,Min Zhang,Panfang Lu,Hongkun Chen
A novel controlled release fertilizer was developed using interpenetrating polymer network (IPN) as the coating material. The IPN was successfully sprayed on the surface of the urea particles to form IPN-coated fertilizers (IPNCU) for controlled nitrogen release. The IPN was synthesized by bio-based polyamide (PA) from d -glucaric acid and epoxy (EP) through network interpenetrating. The chemical structure and microscopic morphology characteristics of IPN were examined by Fourier transform infrared spectroscopy, 1 H-nuclear magnetic resonance, and scanning electron microscopy. The property of IPN with the different PA/EP mass ratios were investigated and compared with that of EP-coated fertilizers (EPCU). The nutrient release behaviors of IPNCU in water and soil were detected. The results showed that the IPNCU with 5% PA content increased the nitrogen release longevity by 41 days, raised the water contact angle of surface by 23.9°, and then significantly slowed the nitrogen release rate of the IPNCU. The nutrient release mechanism of IPNCU was discussed in detail. This work indicated that the environment-friendly IPN with superior controlled release properties could be especially useful in horticultural and agricultural applications. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46052.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 46
·e53145
·
IF 3.057
Qin Li,Hao Zhang,Mingyu Guo
Although poly(L-lactic acid) (PLA) has been widely studied and used in biomedical areas because of its well-known biocompatibility, degradability and renewability, its potential application is still greatly limited by its brittleness and poor ductility. In this work, we, for the first time, reported a series of multi-urea linkage segmented ultra-strong thermoplastic polyurethane-urea (PUU) copolymers using PLA and poly(ε-caprolactone) as the mixed soft segments and water as an indirect in situ chain extender. The tensile strength, elongation at break and tensile modulus of the obtained PUU copolymers are 45–52 MPa, 380–540% and 180–430 MPa, respectively. After a simple one-step uniaxial tensile deformation was applied to these PUU copolymers, their tensile strength and tensile modulus could be dramatically increased to 200 and 630 MPa, respectively, while maintaining enough good ductility (elongation at break >50%). Scanning electron microscope and Wide-angle X-ray Diffraction results showed that the dramatically improved mechanical performance should be mainly attributed to their more oriented microstructures. This study provided an easy strategy to pursuing synthetic PLA based biopolymers combining with ultrahigh mechanical strength and biocompatible and degradable properties.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 13
·e55172
·
IF 2.7
Guochen Wang,Weiping Xu,Yanxin Zhang,Dong Chen,Yuhong Ma,Changtong Song,Wantai Yang
Dynamic B O bonds are often applied to fabricate reversible-cross-linking and reprocessable polymer networks due to their high thermodynamic stability and kinetic tunability. However, it is still difficult to tailor boronic ester polymers, which have both excellent mechanical and self-healing properties in the absence of external stimuli. To address the above challenge, a range of room-temperature self-healable vitrimers are prepared by the reactions of various poly(vinyl hydroxyalkyl ether- alt -dialkyl maleate) copolymers and 1,4-phenyldiboronic acid. The dynamic cross-linking networks offer the as-prepared vitrimers superior mechanical properties and thermostability. Because of the presence of dynamic boronic ester bonds, the networks also demonstrated self-healing (the tensile strength recovered to 83% after 3 days at room temperature) and reprocessing capabilities (no significant change in tensile strength after thrice process recycles). Moreover, the vitrimers have potential as promising damping materials with wide temperature windows around room temperature. For example, the vitrimer of poly(ethylene glycol monovinyl ether- alt -dibutyl maleate) and 1,4-phenyldiboronic acid demonstrates its tan δ max 1.18, T g = 6.2°C and effective damping temperature range is from −16.4 to 48.5°C.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 20
·50444
·
IF 3.125
Xinxing Zhang,Qingyin Wang,Shaoying Liu,Lilei Zhang,Gongying Wang
To get better processability and preparing process of Poly (ethylene terephthalate) polymer, -NO 2 was used to modify Schiff Base to synthesize a novel flame retardant monomer of 5-([3-nitrobenzylidene] amino) isophthalic acid (BNA) to prepare flame retardant and anti-dripping PET copolyester (BNA n PETs), where the electron effect of -NO 2 passivate the cross-linking reactivity of BNA in BNA n PETs to enhance its cross-linking temperature to improve its processing zone with better processability. The results demonstrated that the cross-linking temperature of BNA n PETs was improved from the range of (250–348°C) to (355–385°C), and BNA accelerated the reaction of the polycondensation of PET for saving time of 42%. -NO 2 enhanced the residue char of BNA n PETs in high temperature and further improved its flame retardancy. BNA 10 PET with 7.2 mol% of BNA had LOI of 31.8% and V-0 of UL-94 without drip, and the introduction of –NO 2 did not change the flame retardant mechanism in BNA n PETs.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 4
·49734
·
IF 2.52
Qirui Yi,Jingyu Li,Runhua Zhang,Erni Ma,Ru Liu
Small particle diameter thermally expandable microspheres (TEMs) were obtained for potential utilization in wood, with special attention on their particle diameters and expansion properties. The revolving speed of homogenization (RS) of 800 ~ 3000 r min −1 was applied in suspension polymerization under atmospheric pressure to prepare TEMs, with n -hexane as core material and the copolymer of acrylonitrile, methyl acrylate, and vinyl acetate as shell. (a) The effect of the RS on the particle diameters of TEMs presented a negative correlation at low RS and remained stable at high RS, (b) When the RS was 1900 ~ 2100 r min −1 , the optimized TEMs with average particle diameters of 3.82 ~ 4.06 μm were prepared, possessing expansion ratios of 3.4 ~ 4.3 and an expansion temperature of 112°C, (c)The optimized TEMs had core-shell structure and high encapsulated content of alkane, and (d) The TEMs with small particle diameters could be impregnated into wood and expand successfully in wood cell lumens.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52900
·
IF 3.057
Caixing Peng,Zhan Shu,Cencen Zhang,Xiuhao Chen,Mengting Wang,Lihong Fan
Bone tissue engineering plays an important role in the treatment of bone defects. Finding suitable bone graft substitute scaffolds is still a major challenge. In this study, we combined silk fibroin-octacalcium phosphate composite with silk fibroin by freeze-drying technology, and the freeze-dried scaffolds were further surface-modified with self-polymerization by using dopamine. The silk fibroin/octacalcium phosphate/polydopamine composite bone scaffold was successfully constructed. The composition and structure of the scaffolds were examined through Fourier infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The effects of different concentrations of polydopamine coatings on the porosity, swelling property, hydrophilicity, compressive strength, mineralization ability and biocompatibility of scaffolds were measured. The experimental results showed that the scaffolds had interconnected 3D network structure and polydopamine coating increased the compressive strength of SF scaffolds, delayed the degradation rate of scaffolds and enhanced the apatite deposition rate on the surface of scaffolds. The relative viability of cells increased with the rising of the concentration of coated polydopamine after co-culture with MC3T3-E1 cells. The polydopamine coating conferred the scaffolds excellent bioactivity. Therefore, silk fibroin/octacalcium phosphate/polydopamine composite scaffold may provide a new idea for bone tissue engineering.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 4
·49748
·
IF 2.52
Qian Zhang,Guokang Chen,Kun Wu,Jun Shi,Liyan Liang,Mangeng Lu
The booming of modern electronic devices featuring increasing power and multi-functionalization demands novel high thermal conductive materials with various functions, such as self-healing property and high deformability, while traditional polymer-based or metallic-based materials could hardly provide. Therefore, we report a high thermal conductive and disulfide-based self-healable and reprocessible liquid crystalline elastomer (SHLCE) composite by incorporating graphene nanoplates (GNPs) fillers. The obtained GNPs/SHLCE composites exhibited desired thermal conductivity (5.08 Wm −1 K −1 ) when the content of GNPs was 20 wt% to the composites. Moreover, the GNPs/SHLCE composites showed intriguing recycled performance (Tensile strength after recycle could maintain over 93% compared with that of original composites). Furthermore, we concluded that the improved thermal conductivity of GNPs/SHLCE composites was beneficial to the thermal induced reprocessible and shelf-healable systems.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51932
·
IF 3.125
Hao Liu,Dongcheng Sun
A supramolecular waterborne polyurethane (SWPU) with excellent mechanical and self-healing properties simultaneously is reported in this work. Herein, the SWPU were synthesized by using 2,4-diamino-6-undecyl-1,3,5-triazine react with isophorone diisocyanate to introduce ureidotriazine (UTr) structures into the main chain of polyurethane that can self-assemble to form quadruple hydrogen bonds systems. A higher dimerization constant obtained through introducing two intramolecular hexatomic ring hydrogen bonds into the UTr structure, and the hydrophobicity, plasticity brought by the undecyl group on the triazine ring are beneficial to make a great balance between the binding strength for mechanical performance and the chain reversibility, mobility for self-healing. Owing to the accuracy design, the SWPU exhibits high tensile stress (33.85 MPa) and excellent self-healing ability (90.52%), which shows an enormous application potential in the field of functional coatings and adhesives.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 47
·app51414
·
IF 3.125
Keqian Gong,Xiangyang Xu,Qi Liu,Zexian Han,Wei Huang,Chenyu Huang,Xiangning Huang
Solution blending approach was introduced to prepare flexible Polycarbonate (PC)-based composited films with excellent transparent projection performance. After modified by an aluminate coupling agent DL-411(ACA-1), alumina (Al 2 O 3 ) possesses improved dispersity. There may form oxygen bridge between aluminum atoms on Al 2 O 3 and ACA-1. With the long aliphatic chain directing outwards, the compatibility between PC and modified Al 2 O 3 was significantly improved. The dispersion of Al 2 O 3 particles in PC was therewith promoted. After vacuum drying, well-blended mixtures were developed and PC films containing Al 2 O 3 clusters can be prepared. The composite films have good light transmission and diffuse reflection effects. When Al 2 O 3 /PC mass ratio is beneath 0.2, the composited films possess excellent transparency comparable with pure PC film. The diffuse reflection performance of PC composite films is gradually enhanced with the increase of Al 2 O 3 content. When Al 2 O 3 /PC ratio attains 0.1, the visible light reflectance amounts 15%, which can even exceed 30% with the ratio reaches 0.5. The composite films show improved resistance to UV irradiation as the visible light reflectance and transparency are comparable to un-radiated samples. The hydrophobicity of composite films with a certain Al 2 O 3 amount increases, which brings forth good anti-moisture property for these transparent projection screen films.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Fuchong Li,Yang Gao,Chen Yu,Hailong Yang,Gai Guo Liu,Wei Cao,Jinshan Guo
The traditional batch synthesis of liquid rubber faces issues such as low monomer polymerization concentration, poor uniformity of the reaction system, and inadequate heat dissipation, resulting in an unsatisfactory synthesis efficiency. This study presents a method for the rapid and efficient synthesis of high vinyl 1,2-polybutadiene liquid rubber using butadiene as the monomer and n -butyllithium as the initiator. By applying continuous flow microchannel reactors, the limitation of traditional synthesis method can be overcome. The addition of a modifier in the raw material promotes the formation of high vinyl structure. The preparation of liquid rubber requires the addition of a large amount of metal lithium initiator. However, for aerospace sealants, there is a requirement for low metal ion content. To address this, we employed different methods to reduce the metal ion content in the liquid rubber and increase its purity. Ultimately, we achieved the synthesis of high-purity polybutadiene liquid rubber with 1,2-vinyl content exceeding 88%, narrow molecular weight distribution, and tunable molecular weights. This research will provide technical guidance for the industrial application of polybutadiene synthesis in continuous flow microchannel reactors.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 31
·50760
·
IF 3.125
Xiaochen Yu,Jia Zheng,Zhaoxi Zhou,Qihui Chen,Maochun Hong,Heqing Fu
Firstly, cerium dioxide(CeO 2 ) was modified by 3-(Methylacryloxyl)propyltrimethoxy silane (KH-570), and modified CeO 2 (mCeO 2 ) was prepared. Then poly (urethane-acrylate) was modified by mCeO 2 , and poly (urethane-acrylate)/modified CeO 2 (PUA/mCeO 2 ) composites with ultraviolet absorption property were prepared. The morphology, thermal hydrophobicity, mechanical properties, optical properties, and UV-absorption properties of PUA/mCeO 2 composites were studied. XRD and SEM analysis showed that the modified CeO 2 had better dispersion in the matrix than that of pure CeO 2 . Ultraviolet–visible spectrum and thermogravimetric analysis were used to characterize the optical properties and thermal stability of PUA/mCeO 2 composites. The results showed that with the increasing of the mCeO 2 content, the UV-absorption property of PUA/mCeO 2 composites was improved gradually. When the content of mCeO 2 is 3%, the absorption of ultraviolet of PUA/mCeO2 composites is about 5 times of pure PUA film, and the absorption band is mainly in the UVA section. The thermal stability of PUA/mCeO 2 composites was improved with the adding of mCeO 2 . With the increasing of mCeO 2 content, the contact angle of PUA/mCeO 2 composites increased significantly. And the UV-absorption mechanism of PUA/mCeO 2 Composites was studied. UV-curable PUA/mCeO 2 composites have good UV absorption property and water resistance. They will be used in the sun screen and protect people's skin.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 30
·e52687
·
IF 3.057
Mingshuai Fan,Zhiyuan He,Lu Wu,Ping Tang,Yuezhen Bin
Flexible sensors based on conductive hydrogels have shown surprising potential in the field of electronic skin and human–computer interaction. However, pure water in the hydrogel will inevitably freeze at low temperature or evaporate quickly in dry environment, resulting in the failure of hydrogel as a flexible sensor. Here, inorganic ions (Li + and Cl − ) and glycerol were introduced into the polyacrylamide/sodium carboxymethylcellulose (PAM/CMCNa) composite hydrogel networks through the strategy of solvent replacement. The optimized hydrogel had a quite large elongation at break of 2000%, and a breaking strength of more than 0.14 MPa. The synergistic effect of inorganic ions and glycerol enabled the hydrogel to maintain a good flexibility in a wide temperature range of −20–45°C, which could meet the work needs of the hydrogel in high temperature or extremely cold environments. The hydrogel showed a very wide working range of 1000%, a fast response time of 150 ms, and a high stability and repeatability of 500 cycles during strain sensing detection. Besides, the hydrogel could capture the large and subtle body movements accurately and stably. Therefore, this hydrogel may be applied as in wearable sensing devices used in extreme environments.
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高影响因子
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