COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Xia Zhou,Shuilai Qiu,Lingxin He,Wei Cai,Fukai Chu,Yulu Zhu,Xin Jiang,Lei Song,Yuan Hu
As known, the poor toughness and low fire safety of bismaleimide resin (BMI) has become a problem which restricts its further application in advanced high-performance field. Therefore, a novel allyl-functionalized linear polyphosphazene (PMAP) was designed and synthesized. With inclusion of 3wt% PMAP , the peak heat release rate (PHRR) and total smoke production (TSP) of BMI/PMAP-3 are reduced by 51.3% and 17.8%, respectively. And the residual char of BMI/PMAP increases significantly as well. Furthermore, the flame-retardant mechanism of BMI/PMAP is proposed. In condensed phase, PMAP can participate in the formation of residual char of BMI/PMAP and the char layer is with an excellent physical barrier effect by the existence of phosphorus oxygen and phosphorus nitrogen cross-linking substances. In gas phase, phosphorous oxygen free radical is also generated from PMAP, which can capture gas-phase chain free radicals and inhibit gas-phase combustion. Moreover, the impact strength of BMI/PMAP-3 increases by 85.3%, which indicates that the toughness of BMI/PMAP is effectively enhanced. The toughening mechanism of PMAP on BMI can be assigned to elastomer toughening. Therefore, with modification of PMAP, BMI/PMAP is indeed of better comprehensive performance, which is in line with expectation and provides inspiration for the simultaneous flame-retardant and toughening modification of BMI.
研究领域:
材料科学
·
高分子化学
·
阻燃材料
✓ 已验证
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Lili Zhang,Tengyu Feng,Haodong Chen,Weiwei Dong,Yuxuan Xu,Jun Shen,Xiaodong Wang
To expand the variety of partially bio-based epoxy resins with superior performance and improve the efficiency of utilizing renewable raw materials, a chitosan-based bisphenol A epoxy resin (CBE) was successfully synthesized. With PA651 as the curing agent, the strain energy CBE/PA651 reached 15.11 MJ m −3 , which was higher than those of many typical ductile epoxy resins in comparative literature. The shape fixity and shape recovery rate of CBE/PA651 were 94.72 % and 98.74 %, respectively, demonstrating excellent shape memory effects. When CBE was used as wood adhesives, it exhibited a relatively high bonding strength and excellent water resistance, and the dry and boiling bond strength can exceed 4.08 MPa and 1.91 MPa, respectively. Simultaneously, CBE/PA651 can be completely degraded within 8 h at 90 °C, exhibiting excellent degradability. In addition, CBE was employed as a toughening agent for DGEBA/DDM. It was found that when the CBE content was 20 wt%, the elongation at break, the impact strength, and K IC of CBE/DGEBA/DDM reached their peak values of 8.55 %, 17.62 kJ m −2 and 1.75 MPa m 1/2 respectively, representing a significant increase of 101.65 %, 43.6 %, and 78.57 % compared to DGEBA/DDM. The toughening mechanism was revealed by SEM and crosslinking simulation networks.
研究领域:
材料科学
·
化学工程
·
可再生资源利用
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Shaoheng Yang,Heng Fang,Hai Li,Fangning Shen,Xudong Chen,Yang Hu,Zhuohong Yang
Anti-corrosion coatings are of great significance for marine equipment and engineering on account of the harsh marine environment. Vinyl ester resin is widely used as a resin material for anti-corrosion coating because of its excellent hardness and protective performance. However, the intrinsic brittleness of vinyl ester resin causes the resulting coating film with poor toughness. In this study, the tung oil-based toughen modifier (TOAMA) with a long carbon chain and annular structure is firstly prepared by Diels-Alder reaction of tung oleic acid and maleic anhydride under solvent-free conditions, and then used as a reactive toughening agent to synthesize toughened vinyl ester resin. The characterization results of Fourier transform infrared and hydrogen nuclear magnetic resonance spectroscopies reveal the successful synthesis of the TOAMA-toughened vinyl ester resin. Furthermore, the toughened vinyl ester resin is used in the anti-corrosion coatings, and the properties of the related cured coating films including thermostability, mechanical performance and corrosion resistance are systematically studied. The related results display that TOAMA can effectively toughen vinyl ester resin, and the toughened vinyl ester resin prepared with the optimized TOAMA content can effectively improve the mechanical properties including mechanical strength , elongation at break and fracture toughness, and achieve favorable thermal stability and excellent corrosion resistance of the cured coating films. Grafting tung oil-based toughening modifier TOAMA into the backbone of vinyl ester resin effectively provides a significant promising method to toughen vinyl ester resin, which is beneficial to the application of vinyl ester resin in the marine anti-corrosion coating field.
研究领域:
材料科学
·
化学工程
·
海洋工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 17
·10567-10580
·
IF 2.599
Tong Zaizai,Zhuo Wangqian,Zhou Jie,Huang Runsheng,Jiang Guohua
Noncovalent functionalization was used to modify the graphene nanosheets via π – π stacking of pyrene-terminated molecule (Py-LC), resulting in an intercalated layer structure incorporated with about 45 wt% of Py-LC. The organically modified graphene (Py-LC-rGO) has a better dispersion in the PET matrix compared with that without modification. Consequently, it remarkably accelerates the crystallization of PET. Moreover, the nucleation ability of Py-LC-rGO is even stronger than that of commercial nucleation agent, sodium benzoate, leading to a thicker lamellar crystals and denser stacking of lamellae. Accordingly, the impact toughness of such a composite is improved to be nine times as that of neat PET, which can be a promising candidate as nanofiller for PET.
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
危险品化学品经营许可证（带存储）