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Bian F, Li X, Zhao J, Gui X, Hu J, Li S, Lin S. Synthesis of epoxy-based silicone prepolymers with UV/moisture dual curability for applications in anti-graffiti coatings. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2022.105396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Berzins R, Merijs-Meri R, Zicans J. Comparison of Two-Component Silyl-Terminated Polyether/Epoxy Resin Model and Complete Systems and Evaluation of Their Mechanical, Rheological and Adhesive Properties. Polymers (Basel) 2022; 14:polym14122421. [PMID: 35745997 PMCID: PMC9230202 DOI: 10.3390/polym14122421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/07/2022] [Accepted: 06/13/2022] [Indexed: 02/04/2023] Open
Abstract
The current research is devoted to the investigation of the influence of a secondary amine compatibilizer and customized additive package on the tensile, rheological and adhesive properties of a Silyl-terminated polyether (SIL)/Epoxy resin (EP) model and completed two-component systems. A SIL/EP model and completed two-component systems were developed over a broad range of the both pre-polymer ratios (90/10-30/70 wt.-to-wt%). Additive packages of the components A and B were designed to prevent premature polycondensation of the respective pre-polymers (including suitable catalysts for each of the pre-polymers, as well as vinyltrimetoxysilane as a drying agent for moisture control), to ensure easy processing and stable performance of the system. Results of the investigation testify that the values of the tensile strength and Shore-A hardness of the compatibilized systems are higher in comparison to unmodified ones. In the presence of the additive package, a further improvement of tensile strength and tensile strain values is observed for SIL-rich compositions (SIL content above 70 wt%), whereas at lower SIL concentrations, the reinforcing effect is considerably reduced. In respects to adhesion properties, the highest values to a broad range of substrates with different surface polarities are observed at the SIL/EP range from 80/20 to 50/50 wt.-to-wt%.
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Singh A, Singh A, Srivastava D, Kociok-Köhn G, Köhn RD, Kumar A, Muddassir M. New di- n-butyltin( iv)-bis-(1-alkoxy-isoquinoline-4-nitrile thiolate): crystallographic and computational studies. CrystEngComm 2022. [DOI: 10.1039/d2ce00536k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Alcohol and n-Bu2Sn2+ assisted cyclization of dithiolate yielded two unexpected organotin(iv) products, their reaction mechanism and nature of weak interactions assessed.
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Affiliation(s)
- Amita Singh
- Department of Chemistry, Dr. Ram Manohar Lohiya Avadh University, Ayodhya 224 001, India
- Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226 007, India
| | - Ayushi Singh
- Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226 007, India
| | - Devyani Srivastava
- Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226 007, India
| | - Gabriele Kociok-Köhn
- Materials and Chemical Characterisation Facility (MC2), University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Randolf D. Köhn
- Department of Chemistry, University of Bath, Calverton Down, Bath, BA2 7AY, UK
| | - Abhinav Kumar
- Department of Chemistry, Faculty of Science, University of Lucknow, Lucknow 226 007, India
| | - Mohd. Muddassir
- Department of Chemistry, College of Sciences, King Saud University, Riyadh 11451, Saudi Arabia
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Wendels S, de Souza Porto D, Avérous L. Synthesis of Biobased and Hybrid Polyurethane Xerogels from Bacterial Polyester for Potential Biomedical Applications. Polymers (Basel) 2021; 13:4256. [PMID: 34883759 PMCID: PMC8659847 DOI: 10.3390/polym13234256] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 11/30/2021] [Accepted: 12/02/2021] [Indexed: 12/03/2022] Open
Abstract
Organic-inorganic xerogel networks were synthesized from bacterial poly (3-hydroxybutyrate) (PHB) for potential biomedical applications. Since silane-based networks usually demonstrate increased biocompatibility and mechanical properties, siloxane groups have been added onto polyurethane (PU) architectures. In this work, a diol oligomer (oligoPHB-diol) was first prepared from bacterial poly(3-hydroxybutyrate) (PHB) with an environmentally friendly method. Then, hexamethylene diisocyanate or biobased dimeryl diisocyanate was used as diisocyanate to react with the short oligoPHB-diol for the synthesis of different NCO-terminated PU systems in a bulk process and without catalyst. Various PU systems containing increasing NCO/OH molar ratios were prepared. Siloxane precursors were then obtained after reaction of the NCO-terminated PUs with (3-aminopropyl)triethoxysilane, resulting in silane-terminated polymers. These structures were confirmed by different analytical techniques. Finally, four series of xerogels were prepared via a sol-gel process from the siloxane precursors, and their properties were evaluated depending on varying parameters such as the inorganic network crosslinking density. The final xerogels exhibited adequate properties in connection with biomedical applications such as a high in vitro degradation up to 15 wt% after 12 weeks.
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Affiliation(s)
| | | | - Luc Avérous
- BioTeam/ICPEES-ECPM, UMR CNRS 7515, University of Strasbourg, 25 Rue Becquerel, 67087 Strasbourg, France; (S.W.); (D.d.S.P.)
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Fuensanta M, Martín-Martínez JM. Structural and Viscoelastic Properties of Thermoplastic Polyurethanes Containing Mixed Soft Segments with Potential Application as Pressure Sensitive Adhesives. Polymers (Basel) 2021; 13:polym13183097. [PMID: 34577998 PMCID: PMC8467287 DOI: 10.3390/polym13183097] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 08/24/2021] [Accepted: 09/10/2021] [Indexed: 11/16/2022] Open
Abstract
Thermoplastic polyurethanes (TPUs) were synthetized with blends of poly(propylene glycol) (PPG) and poly(1,4-butylene adipate) (PAd) polyols, diphenylmethane-4,4′-diisocyanate (MDI) and 1,4-butanediol (BD) chain extender; different NCO/OH ratios were used. The structure and viscoelastic properties of the TPUs were assessed by infrared spectroscopy, differential scanning calorimetry, X-ray diffraction, thermal gravimetric analysis and plate-plate rheology, and their pressure sensitive adhesion properties were assessed by probe tack and 180° peel tests. The incompatibility of the PPG and PAd soft segments and the segregation of the hard and soft segments determined the phase separation and the viscoelastic properties of the TPUs. On the other hand, the increase of the NCO/OH ratio improved the miscibility of the PPG and PAd soft segments and decreased the extent of phase separation. The temperatures of the cool crystallization and melting were lower and their enthalpies were higher in the TPU made with NCO/OH ratio of 1.20. The moduli of the TPUs increased by increasing the NCO/OH ratio, and the tack was higher by decreasing the NCO/OH ratio. In general, a good agreement between the predicted and experimental tack and 180° peel strength values was obtained, and the TPUs synthesized with PPG+PAd soft segments had potential application as pressure sensitive adhesives (PSAs).
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Younes G, Price G, Dandurand Y, Maric M. Study of Moisture-Curable Hybrid NIPUs Based on Glycerol with Various Diamines: Emergent Advantages of PDMS Diamines. ACS OMEGA 2020; 5:30657-30670. [PMID: 33283114 PMCID: PMC7711944 DOI: 10.1021/acsomega.0c04689] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 10/28/2020] [Indexed: 06/12/2023]
Abstract
A sol/gel curing method is used in this work to synthesize hybrid partially bio-based polyhydroxyurethanes (PHUs) from dicarbonates derived from glycerol and various diamines. The method consists of end-capping the PHU prepolymers with moisture-sensitive groups, so sealants and adhesives can be produced from partially sustainable hybrid PHUs (HPHUs), similar to their preparation from end-capped conventional polyurethanes. Diglycerol dicarbonate (DGC) is synthesized and polymerized with different diamines of various chain lengths, and the resulting structural and thermal properties of the PHUs are qualitatively and quantitively characterized. This characterization led to two potential candidates: PHU 4, made of DGC and a poly(propylene glycol) diamine, and PHU 10, prepared from DGC and a poly(dimethylsiloxane) diamine. These polymers, with respective relative number-average molecular weights of 3200 and 7400 g/mol, are end-capped and left to cure under ambient lab conditions (22 °C and 40-50% humidity), and the curing processes are monitored rheologically. Notably, moisture curing does not require any catalyst. The chemical stability of the resulting hybrid PHUs (HPHUs) 4 and 10 in pure water is investigated to check the viability of applying them under outdoor conditions. Only HPHU 10 is found to be resistant to water and shows hydrophobicity with a contact angle of 109°. Tensile tests are conducted on HPHU 10 samples cured under lab conditions for a week and others cured for another week while being immersed in water. The mechanical properties, tensile strength and elongation at break, improve with the samples cured in water, indicating the high-water repellency of HPHU 10.
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Affiliation(s)
- Georges
R. Younes
- Department
of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
| | - Gareth Price
- Department
of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
| | | | - Milan Maric
- Department
of Chemical Engineering, McGill University, Montreal, Quebec H3A 0C5, Canada
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Tan C, Luona V, Tirri T, Wilen CE. The Synthesis of Low-Viscosity Organotin-Free Moisture-Curable Silane-Terminated Poly(Urethane-Urea)s. Polymers (Basel) 2018; 10:E781. [PMID: 30960706 PMCID: PMC6403764 DOI: 10.3390/polym10070781] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Revised: 07/04/2018] [Accepted: 07/06/2018] [Indexed: 11/17/2022] Open
Abstract
This work explores the possibility of synthesizing moisture-curable silane-terminated poly(urethane-urea)s (SPURs) of low viscosity. First, NCO-terminated urethane prepolymers were prepared, followed by silane end-capping. The impact of polyol molecular weight and the ratio of isocyanate to polyol (NCO/OH) on viscosity and the properties of SPUR were examined. As alternatives to the organotin catalysts traditionally used for the polyurethane synthesis and curing processes, bismuth carboxylate catalysts were evaluated. In addition, the effect of organofunctional groups in the aminosilane structure (R1⁻NH⁻R2⁻Si(OR3)₃), i.e., R1 (alkyl, aryl or trimethoxysilyl-propyl), the spacer R2 (α or γ) and alkyl group R3 (methyl or ethyl), was examined. The chemical and physical structures of the SPUR were investigated by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FT-IR) and the mechanical properties were evaluated by tensile tests. The results reveal that silane-terminated, moisture-curable polyurethanes can be successfully synthesized and cured with bismuth carboxylate catalysts. SPUR exhibiting low viscosity, with adequate tensile strength and elongation can be prepared using environmentally benign bismuth carboxylate catalyst having a high metal content of 19%⁻21%, by utilizing secondary aminosilane end-cappers and an optimal combination of the polyol molecular weight and NCO/OH ratio.
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Affiliation(s)
- Chen Tan
- Laboratory of Polymer Technology and Center for Functional Materials, Faculty of Science and Engineering/Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, 20500 Turku, Finland.
| | - Viivi Luona
- Laboratory of Polymer Technology and Center for Functional Materials, Faculty of Science and Engineering/Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, 20500 Turku, Finland.
| | - Teija Tirri
- Laboratory of Polymer Technology and Center for Functional Materials, Faculty of Science and Engineering/Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, 20500 Turku, Finland.
| | - Carl-Eric Wilen
- Laboratory of Polymer Technology and Center for Functional Materials, Faculty of Science and Engineering/Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, 20500 Turku, Finland.
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Yuan Y, Zhang Y, Fu X, Kong W, Liu Z, Hu K, Jiang L, Lei J. Molecular design for silane-terminated polyurethane applied to moisture-curable pressure-sensitive adhesive. J Appl Polym Sci 2017. [DOI: 10.1002/app.45292] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ye Yuan
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Yanyan Zhang
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Xiaowei Fu
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Weibo Kong
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Zhimeng Liu
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Kai Hu
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Liang Jiang
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Jingxin Lei
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
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