Study on reaction kinetics of epoxy resin cured by a modified dicyandiamide

Liu, Feng; Wang, Yulong; Wang, Yanping; Líu, Hao; Zhao, Jianchang

doi:10.1002/app.37917

Cited by 22 publications

(10 citation statements)

References 23 publications

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“…Generally, the conjugation of BSPB into the WPU backbone reinforces the physical and mechanical performance. This phenomenon can be well correlated with the conjugation of bulky rigid heterocyclic triazine ring structure in BSPB and the combined control of increasing hard segments, which is proved to provide more intermolecular interactions and hydrogen bonding, and thus, be responsible for the enforcing effect [33,34]. Moreover, as reported by Chun et al, the urea type bonding, forming by BSPB amino groups and isocyanate terminals, can substantially enhance the strength of polyurethane due to the additional amide linkage [35].…”

Section: Mechanical Propertiesmentioning

confidence: 71%

Flame retardancy, mechanical, and thermal properties of waterborne polyurethane conjugated with a novel phosphorous-nitrogen intumescent flame retardant

Zhang

Tian

et al. 2015

Polym. Compos.

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A novel phosphorous‐nitrogen intumescent flame retardant with reactive diamino groups, benzoguanamine spirocyclic pentaerythritol bisphosphonate (BSPB), was synthesized and used as a chain extender, and then a series of flame retardant waterborne polyurethanes (FRWPU) were prepared by covalently conjugating the BSPB into waterborne polyurethane (WPU) backbone. Their structures were characterized by Fourier transformed infrared spectrometry (FTIR), 1H and 31P nuclear magnetic resonances (NMR), respectively. Simultaneously, the flame retardancy and the thermal stability of FRWPU were systematically investigated by limiting oxygen index (LOI) test, UL‐94 vertical burning test and thermogravimetric analysis (TGA). The results indicated that with the increase of BSPB content from 0 to 8 wt%, the LOI value of FRWPU increased from 18.6 to 27.3%, showing significant improvement by 8.7%. Compared with WPU, FRWPU showed decreased thermal stability but promoted char residue ratio. Conjugation of BSPB could obviously enhance the mechanical properties of FRWPU, the Young's modulus and tensile strength dramatically increased with the increase of BSPB. Investigation of char forming mechanism of BSPB through real time Fourier transform infrared spectra (RTFTIR) and scanning electronic microscopy (SEM) revealed that the polyphosphoric acid and phosphorus oxynitrides rich outer intumescent char layer could form protective shields to inhibit effectively internal polyurethane to heat and flame diffusion during contacting fire. POLYM. COMPOS., 38:452–462, 2017. © 2015 Society of Plastics Engineers

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Section: Mechanical Propertiesmentioning

confidence: 71%

Flame retardancy, mechanical, and thermal properties of waterborne polyurethane conjugated with a novel phosphorous-nitrogen intumescent flame retardant

Zhang

Tian

et al. 2015

Polym. Compos.

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“…Compared with the traditional curing agent, the microcapsule curing agent could be endowed with a longer storage period and a good curing activity at intermediate or high temperature simultaneously by tuning core and shell materials. Most importantly, it could be added into epoxy resin to prepare one‐component system for customer using, which optimizes the production process and improves the product quality 11 …”

Section: Introductionmentioning

confidence: 99%

Preparation and curing behavior of latent 2‐PhIm‐PS microcapsule curing agent for epoxy resin

Yan

Guo²,

et al. 2020

J of Applied Polymer Sci

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A core–shell microcapsule latent epoxy curing agent (2‐PhIm‐PS) is obtained by solvent evaporation method with 2‐phenyl imidazole (2‐PhIm) as the core material and polystyrene (PS) as the wall material. The microcapsule parameters, morphology, structure, curing behavior, and the mechanic properties of cured epoxy resin with this microcapsule latent curing agent were characterized through comparing with 2‐PhIm. The particle size distribution of the microcapsule is narrow, the average particle size is about 10.56 μm, and the core material content is 23%. The prepared 2‐PhIm‐PS microcapsule curing agent has excellent latent curing properties. It can completely cure epoxy resin E‐51 within 10 min at 130°C, and its latent period can be more than 40 days at room temperature. In addition, the curing kinetics of one‐component epoxy resin curing system (E‐51/2‐PhIm‐PS) composed of 2‐PhIm‐PS microcapsules and epoxy resin E‐51 is also studied by using Kissinger equation, Flynn–Wall–Ozawa and Crane formula. The results provide an outline for the evaluation on the applicability of the microcapsule curing agent of 2‐PhIm‐PS for epoxy resin.

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“…Epoxidized vegetable oils (EVOs) are nowadays produced at an industrial scale and used mainly as a plasticizer for polyvinyl chloride (PVC) [16]. Presently, there are numerous research groups devoted to the development of thermosetting epoxy polymers using EVOs as a green alternative to-or at least as a partial replacement or a modifier for-synthetic epoxy resins, which is generating a growing body of literature describing the curing kinetics [18][19][20] and the properties of such materials [7,8,21,22].…”

Section: Introductionmentioning

confidence: 99%

Effect of an Anhydride Excess on the Curing Kinetics and Dynamic Mechanical Properties of Synthetic and Biogenic Epoxy Resins

Altuna

Riccardi

Quintero

et al. 2019

International Journal of Polymer Science

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This work analyzes the effect of the anhydride excess on the nonisothermal curing kinetics and on the final properties of synthetic and biobased epoxy resins. Diglycidyl ether of bisphenol A (DGEBA) and epoxidized soybean oil (ESO) were crosslinked using methyltetrahydrophthalic anhydride (MTHPA) as a curing agent and 1-methylimidazole (1MI) as an initiator. It was shown that the ESO/MTHPA/1MI system reacts slower than the DGEBA/MTHPA/1MI system, giving place to a more significant evaporation of the curing agent during the reaction. As a result, an excess of anhydride improves the final thermal properties of the ESO/MTHPA/1MI network, contrary to the behavior observed for DGEBA/MTHPA/1MI. The knowledge of the kinetics of the curing process and the optimal amount of the curing agent for each system is of critical importance for a more efficient processing of these materials.

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Study on reaction kinetics of epoxy resin cured by a modified dicyandiamide

Cited by 22 publications

References 23 publications

Flame retardancy, mechanical, and thermal properties of waterborne polyurethane conjugated with a novel phosphorous-nitrogen intumescent flame retardant

Flame retardancy, mechanical, and thermal properties of waterborne polyurethane conjugated with a novel phosphorous-nitrogen intumescent flame retardant

Preparation and curing behavior of latent 2‐PhIm‐PS microcapsule curing agent for epoxy resin

Effect of an Anhydride Excess on the Curing Kinetics and Dynamic Mechanical Properties of Synthetic and Biogenic Epoxy Resins

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