Two Branched Silicone Resins with Different Reactive Groups: A Comparative Evaluation

Zhan, Xibing; Liu, Huijuan; Zhang, Junying

doi:10.1021/acs.iecr.7b05172

Cited by 5 publications

(3 citation statements)

References 44 publications

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“…Silicate Resin is mainly a milky whitish compound, waterbased and formed from Silicon and Carbon elements. This compound has a 3-D polymeric structure with Si-O-Si backbone chains and organic R groups linking with silicon atoms (Jia et al 2009, Zhan et al 2018, which provides a hydrophobic resistance against water, and high resistance to heat.…”

Section: Methodsmentioning

confidence: 99%

Moisture evaluation of concrete pavement treated with hydrophobic surface impregnants

Al-Kheetan,

Rahman,

Chamberlain

2019

International Journal of Pavement Engineering

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Despite excellent service history, concrete pavement faces accelerated deterioration due to water and chemical ingress through micro cracks and surface voids. Surface protection could be an inexpensive way of enhancing the durability of concrete pavement. This research focuses on evaluating the performance of three surface applied hydrophobic materials with different chemistries; fluoropolymer, silicate resin and sodium acetate crystallising material. Tests consisted of a microscopic study to assess the mechanism of treatment, contact angle and pendulum tests to evaluate the hydrophobicity and frictional properties of treatment respectively. Also, surface absorption and water intake tests were conducted to appraise the resistance of treatment to absorb water. It was found that all three materials are capable of developing a hydrophobic effect in concrete, but with different efficacy in reducing water absorption. The rate of water absorption was minimum for sodium acetate compared to fluoropolymer and silicate resin treatments. Scanning Electron Microscope (SEM) analysis revealed different interaction approaches for the three materials with concrete.

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Section: Methodsmentioning

confidence: 99%

Moisture evaluation of concrete pavement treated with hydrophobic surface impregnants

Al-Kheetan,

Rahman,

Chamberlain

2019

International Journal of Pavement Engineering

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“…The increments mentioned before can be attributed to the following: as more heat is released with an increased heating rate, the temperature gradient between the reaction center and the external environment due to thermal inertia increases. [35,45,46] The exothermic peak temperature is believed to shift to a higher temperature zone for compensation. [47] The DSC curves of BNPF/HMTA resin show two distinct exothermic peaks.…”

Section: Non-isothermal Dsc Analysis Of Npf/hmta and Bnpf/hmta Resinsmentioning

confidence: 99%

A Non-isothermal Curing Kinetic Studies of Novolac Type Phenol-Formaldehyde Resin for 3D Printing of Sustainable Building Design

Bansode,

Vega Erramuspe,

Portilla Villarreal

et al. 2024

Preprint

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Novolac phenol-formaldehyde resins have gained extensive commercial utilization across diverse applications due to their exceptional mechanical, thermal, and chemical resistance properties. In this investigation, we successfully synthesized a traditional novolac, and a biobased novolac phenol-formaldehyde resin by partially substituting phenol with a bio-oil obtained from the organic phase resulting from the fast pyrolysis of pinewood biomass. Despite extensive investigations into the curing behavior of novolac resins crosslinked with hexamethylenetetramine (HMTA) through numerous model-fitting cure kinetic studies, a comprehensive model for predicting the crosslinking of bio-based phenol-formaldehyde resins in the presence of HMTA has not yet been studied. The primary objective of this research was to compare and apply several commonly used kinetic models to predict the degree of curing and cure rate of the synthesized resins, using DSC dynamic measurements. Our results demonstrated that the autocatalytic model exhibited excellent fitting for the traditional novolac resin and HMTA mixture, while the Kamal model showed better fitting with the experimental data obtained for the bio-based phenol-formaldehyde resin and HMTA system. In addition, the results evidenced a significant drop in the curing temperature by partially replacing phenol with bio-oil. Additionally, the results revealed a notable reduction in curing temperature when phenol was partially substituted with bio-oil. This substitution not only offers environmental benefits but also promotes energy efficiency and enhances production safety. The data collected in this study is pivotal for our subsequent research endeavors, which aim to develop environmentally sustainable materials optimized for use in 3D printing manufacturing processes.

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“…Basically, monohydrotrisiloxanes (e.g., Heptamethyltrisiloxane) react with trialkoxyvinylsilanes; then, branched siloxanes and low molar mass alkanes are generated in the presence of BCF (B(C 6 F 5 ) 3 ) as a catalyst [25][26][27][28][29][30][31][32][33], whereas in order to obtain carbosiloxanes, the other type of reaction has to be applied (Figure 1). It can include hydrosilylation process, for instance, which is based on the addition reaction between unsaturated bonds (e.g., CH=CH 2 ) and silicon−hydrogen (Si−H) bonds in the presence of a platinum complex catalyst [34][35][36]. Another group are dendrimers, consisting of polyhedral oligomeric silsesquioxanes (POSS) as a core, obtained utilizing various techniques, depending on the groups introduced into POSS core.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of (Hyper)Branched Monohydroxyl Alkoxysilane Oligomers toward Silanized Urethane Prepolymers

et al. 2022

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The aim of this work was the synthesis of (hyper)branched oligomers based on trialkoxysilane in various conditions and further application of them in order to modify the urethane prepolymers. Hydroxyl-terminated trialkoxysilane was used as a monomer for homo-condensation. It was obtained by reaction of 3-aminopropyl trialkoxysilane (APTES) with ethylene carbonate (EC). The reaction was based on the attack of amine at the carbonyl carbon atom followed by ring opening of the carbonate to give a urethane (carbamate) product. The next step was the condensation via substitution of ethoxy groups on silicon atom with the terminal hydroxyalkyl groups present in the primary product with the evolution of ethanol. Accordingly, the impact of temperature and type of catalyst on process efficiency was investigated. A quantitative analysis of reaction progress and products of the conversion of EC together with ethanol evolution was conducted by means of gas chromatography, which allowed us to determine the formation of monomeric product and, indirectly, of oligomeric products. It was found that at room temperature after 24 h, the majority of the monomeric product was isolated, whereas at elevated temperature in the presence of Ti-based catalyst, further condensation of the monomer into branched oligomers was preferred, and, moreover, the application of vacuum intensified that process. The obtained products were structurally characterized by 1H and 29Si NMR, MALDI-ToF and Gel Permeation Chromatography. Finally, two different alkoxysilane products, monomeric and oligomeric, were applied for modification of urethane prepolymer, forming silanized one (SPUR). The influence of the silanizing agent on the mechanical and thermal properties of the moisture-cured products was shown before and after additional conditioning in water.

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Two Branched Silicone Resins with Different Reactive Groups: A Comparative Evaluation

Cited by 5 publications

References 44 publications

Moisture evaluation of concrete pavement treated with hydrophobic surface impregnants

Moisture evaluation of concrete pavement treated with hydrophobic surface impregnants

A Non-isothermal Curing Kinetic Studies of Novolac Type Phenol-Formaldehyde Resin for 3D Printing of Sustainable Building Design

Synthesis of (Hyper)Branched Monohydroxyl Alkoxysilane Oligomers toward Silanized Urethane Prepolymers

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