A new organosilicon adhesive based on polysiloxane and polysilazane

Liu, Wei; Luo, Yongming; Xu, Caihong

doi:10.1177/0954008312473763

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Schematic overview over possible coupling reactions of polysilazanes (PSz) to prepare silicone networks either directly through reaction with moisture, acrylics/thiols, or with peroxides (previous work), [ 12,13,15,16,18,19,25,30–32 ] or by reaction with multifunctional alcohols at ambient conditions without a catalyst (this work).…”

Section: Introductionmentioning

confidence: 99%

Reactivity of Polysilazanes Allows Catalyst‐Free Curing of Silicones

Sønderbæk‐Jørgensen

Meier

Dam‐Johansen

et al. 2022

Macro Materials & Eng

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Silicones are typically cured at room temperature by means of metal catalyst such as tin or platinum. When networks are formed, the catalyst becomes unrecoverable, which is of economic as well as environmental concern. Very few methods for producing metal catalyst-free room-temperature-vulcanized (RTV) silicones exist and require conditions unavailable in industrial settings. Through the study of organic polysilazane (PSz) reactivity with simple alcohols by nuclear magnetic resonance, an unexpected fragmentation preference is discovered for breaking the Si-N bond rather than the Si-H; thereby, casting a new light on the fragmentation mechanism of PSzs. Utilizing the PSz fragmentation as a silyl ether coupling agent for multifunctional carbinol silicones, a method of producing catalyst-free RTV silicone networks at ambient conditions is presented. These silicone networks are proven chemically similar to a standard condensation-cured silicone and stoichiometric variations of PSz content demonstrate adjustable network properties.

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Section: Introductionmentioning

confidence: 99%

Reactivity of Polysilazanes Allows Catalyst‐Free Curing of Silicones

Sønderbæk‐Jørgensen

Meier

Dam‐Johansen

et al. 2022

Macro Materials & Eng

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“…Polysilazane is a well-known polymeric precursor for silicon nitride ceramic and it has found various applications in the fields of high temperature-resistant adhesive, coating, water-repellent layer and silicon nitride fibre [32][33][34][35][36][37]. It also has been successfully used to modify other organic oligomers and polymers, for example, poly(methyl methacrylate), polyacrylonitrile, unsaturated polyester and aniline formaldehyde resin and epoxy resin [38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Polysilazane as a new foaming agent to prepare high-strength, low-density epoxy foam

Chang

Luo

et al. 2019

R. Soc. open sci.

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Polysilazane (PSN2) was used as chemical foaming agent to prepare epoxy foam for the first time. Using the new foaming agent, epoxy foams with high strength and low density were successfully prepared. The density of epoxy foam can be tuned from 0.321 to 0.151 g cm −3 by changing the content of PSN2 from 2.50 to 7.50 wt%, with the compressive strength varied from 7.39 to 1.25 MPa. The morphology, porosity, mechanical property, thermal conductivity and adhesive property of foams with different polysilazane content were investigated. Besides, the effect of polyamine curing agent and surfactant on foams was also investigated to optimize the as-prepared epoxy foam.

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“…Particles with more reactive vertex groups act as an interfacial interface with multiple physicochemical crosslinkers . The adhesive matrix also relates to the mechanism of reinforcement between vinyl‐containing polysilazane and a multifunctional polysiloxane to construct strong hydrogen bonds . In a previous study, we successfully crosslinked soy protein‐based adhesives through the incorporation of PAE.…”

Section: Introductionmentioning

confidence: 99%

High bonding strength and boiling water resistance of soy protein‐based adhesives via organosilicon–acrylate microemulsion and epoxy synergistic interfacial enhancement

Zhao

Xing

Wang

et al. 2017

J of Applied Polymer Sci

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Boiling water resistance, an important indicator of wood adhesives, represents the capability of adhesives for exterior woodwork applications. However, soy-based adhesives show poor behaviors in this respect, which limit their applications in outdoor environments. In this article, we report a synergistic modification method of integrating a cocrosslinking system of epoxied polyamideamine-epichlorohydrin (PAE) and organosilicon-acrylate copolymer latexes (OACLs) to improve soybean meal (SM)-based adhesive properties. Tailored PAE and OACL SM-based adhesives demonstrated robust crosslinking structures via multi-interfacial interactions, where PAE and OACL served as building blocks of an interpenetrating network, which was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. The dry-shear strength, wet-shear strength, and boiling water strength of the resulting SM-based adhesives were 1.41 6 0.13, 1.32 6 0.17, and 1.20 6 0.11 MPa, respectively, with 15 wt % OACL loading; these were 41, 45, and 90% increases, respectively, over the SM-PAE adhesive with which we compared them. Most importantly, the excellent boiling water resistance of the adhesives make them practical for exterior plywood.Crosslinking is a particularly effective approach for enhancing adhesion properties. Currently, aldehydes, epoxy compounds, natural gellan, and genipin are the most commonly used crosslinkers to form intrapenetrating or interpenetrating networks with a soy-protein matrix. 3,4,17 When the crosslinked adhesive is used under humid conditions, the uniform and tough network limits the permeation of water molecules and, thus, improves the adhesion performance. For example, Li and coworkers 18,19 designed a series of soy protein-based adhesives consisting of a covalently crosslinked polyamideamine-epichlorohydrin (PAE) network and a physically crosslinked attapulgite or carboxylated styrene-butadiene rubber latex network between soy-protein matrixes. The boiling water strength of these adhesives ranged V C 2017 Wiley Periodicals, Inc.

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A new organosilicon adhesive based on polysiloxane and polysilazane

Cited by 6 publications

References 23 publications

Reactivity of Polysilazanes Allows Catalyst‐Free Curing of Silicones

Reactivity of Polysilazanes Allows Catalyst‐Free Curing of Silicones

Polysilazane as a new foaming agent to prepare high-strength, low-density epoxy foam

High bonding strength and boiling water resistance of soy protein‐based adhesives via organosilicon–acrylate microemulsion and epoxy synergistic interfacial enhancement

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