Polythiourethane polymers using castor oil tristhioglycolate as crosslinking agent

Ghatge, N. D.; Murthy, R. A. N.

doi:10.1002/app.1982.070270514

Cited by 14 publications

(7 citation statements)

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“…poly(thiourethane)s and poly(thiourethane-urethane)s. The earliest papers only present the results of the thermal properties of poly(thiourethane) elastomers based on oligobutadiene dithiol, decane-1,10-dithiol and 4,4 0 -diphenylmethane diisocyanate [8] and the investigation on hardness and tensile properties of rubbery poly(thiourethane)s synthesized from a few glycol bisthioglycolates, 2,4-tolylene diisocyanate or 4,4 0 -diphenylmethane diisocyanate and castor oil tristhioglycolate as a crosslinking agent. The latter showed poor tensile properties [9].…”

mentioning

confidence: 99%

New thermoplastic poly(thiourethane-urethane) elastomers based on hexane-1,6-diyl diisocyanate (HDI)

Rogulska

Kultys

Olszewska

2013

J Therm Anal Calorim

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Two series of new thermoplastic poly(thiourethane-urethane) elastomers (EPTURs), with different hardsegment content (40-60 wt%), were synthesized by a onestep melt polymerization from poly(oxytetramethylene) diol (PTMO) of M n = 1,000 g mol -1 or poly(hexamethylene carbonate) diol (PHCD) of M n = 860 g mol -1 as a soft segment, hexane-1,6-diyl diisocyanate and (methylenedi-1,4-phenylene)dimethanethiol as a chain extender at the NCO/(OH ? SH) molar ratio of 1. The structures of all the EPTURs were examined by Fourier transform infrared spectroscopy (FTIR), atomic force microscopy and X-ray diffraction analysis. Their thermal behavior was investigated by means of differential scanning calorimetry and thermogravimetric analysis (TG). For the chosen polymers the gaseous products evolved during the decomposition process were analyzed by TG-FTIR. Moreover, physicochemical, adhesive and tensile properties as well as Shore A/D hardness were determined. The resulting highmolecular-mass EPTURs were stable up to 254-262°C, as measured by the temperature of 1 % mass loss. They decomposed in three or four stages. The main decomposition products were carbonyl sulfide, isocyanate, carbon dioxide, aromatic hydrocarbons as well as aliphatic ethers and aldehydes (in PTMO series) and alcohols (in PHCD series). All the polymers showed partially crystalline structures, associated with crystallization of thiourethane hard segments. Their melting temperatures were in the range of 184-186°C. The PTMO series EPTURs exhibited better low-temperature properties (glass-transition temperature in the range of -64 to -44 vs. -26 to -22°C), but poorer tensile strengths (20-28 vs. 37-43 MPa). These EPTURs showed improved adhesive properties in comparison with their polyurethane analogs.

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confidence: 99%

New thermoplastic poly(thiourethane-urethane) elastomers based on hexane-1,6-diyl diisocyanate (HDI)

Rogulska

Kultys

Olszewska

2013

J Therm Anal Calorim

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“…Rubbery poly(thiourethane) polymers can be prepared from a few glycol bisthioglycolates, TDI or MDI, and castor oil tristhioglycolate as the cross-linking agent (410).…”

Section: Poly(thiourethane)smentioning

confidence: 99%

Sulfur‐Containing Polymers

Kultys

2010

Encyclopedia of Polymer Science and Technology

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Sulfur-containing polymers, when considering their structure, make up a complex group of macromolecular compounds of varied and often remarkable features that determine their versatile applications.The presence of sulfur atoms in polymer structure, depending on the kind of functional group, can improve some important properties, such as mechanical, electrical, and optical, and then adhesion to metals, resistance to heat, chemicals, radiation, and bacteria, biocompatibility, and so on. These are their more important functional groups: sulfide -S-, polysulfide -S n -, sulfonyl -SO 2 -, sulfinyl -SO-, sulfo -SO 3 H, as well as some organic groups containing sulfur atoms, such as thioester -Sulfur-containing polymers can be used as high performance engineering plastics, chemically stable ion-exchange membranes in electromembrane processes, proton-conducting electrolytes, as well as optical, optoelectronic, and photochemical materials. Some polymers are employed in biomedical applications, for example, sulfopolymers as biomembranes and blood-compatible materials, and polysulfates and polysulfonates as antithrombotic or antiviral agents. The presence of sulfur, particularly in the form of disulfide bridges, plays an important role in biopolymers.The purpose of this review is mainly to present recent advances in the area of sulfur-containing polymers that may not yet have commercial applications. Nevertheless, older but still significant material has been included at the beginning of the discussion of each class. Poly(monosulfide)sPolymers containing a monosulfide linkage in both the main chain and the pendent group are the subject of many detailed studies. A few reviews of the synthesis and properties of all types of polymers have been published (1-4); like the one covering polymer with sulfur in the main chain that appeared in 1992 (3). Polysulfides with controlled and well-defined structures can be easily prepared. Nevertheless, the only commercial poly(monosulfide) is Ryton [Philips Petroleum Co., poly(thio-1,4-phenylene) more frequently referred to as poly(p-phenylene sulfide) or poly(phenylene sulfide) (PPS)].

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“…The sulfur element can be from either of the reactants or two of them. The refractive index of polythiourethanes can be as high as 1.71 or even higher due to the addition of the sulfur element in the polyurethane structure [6][7][8][9]. Polythiourethanes with high refractive index and low chromatic dispersion have replaced traditional eyeglass lenses and are popular among people, due to their lightness, good impact strength, and good processability [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Cure Kinetics of an Optical Polythiourethane with Amine Catalyst by IR Analysis

Zhang

Wang

et al. 2019

International Journal of Polymer Science

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An optical polythiourethane based on m-xylylene diisocyanate (XDI) and 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol (BES) has been studied. Triethylamine was adopted as a catalyst, and the solid-state isothermal cure reaction was carried out using FTIR spectroscopy, in the temperature range of 75°C-105°C. The -NCO absorption band of XDI was used to monitor the conversion of diisocyanate into polythiourethane. The reaction rate enhanced with an increase in the content of the catalyst, and the gel time determined by swelling test was shorter for the system with higher catalyst content. Kinetic parameters were calculated from the infrared spectrum data, and the results showed that the curing reaction of polythiourethane accords with first-order kinetic characteristics. The activation parameters obtained from the evaluation of kinetic data were △H∗=97.22 kJ mol−1, △S∗=−6.77 J K−1 mol−1, and Ea=100.23 kJ mol−1. The observed negative entropy of activation value supported the formation of a transition state in the cure reaction.

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Polythiourethane polymers using castor oil tristhioglycolate as crosslinking agent

Abstract: SynopsisPolythiourethane polymers were synthesized from a few glycol polythioglycolates and TDI or MDL Castor oil tristhioglycolate, a new trithiol, was tried as a crosslinking agent. Mechanical and solvent resistance properties of the cured products are reported.

Cited by 14 publications

References 0 publications

New thermoplastic poly(thiourethane-urethane) elastomers based on hexane-1,6-diyl diisocyanate (HDI)

New thermoplastic poly(thiourethane-urethane) elastomers based on hexane-1,6-diyl diisocyanate (HDI)

Sulfur‐Containing Polymers

Cure Kinetics of an Optical Polythiourethane with Amine Catalyst by IR Analysis

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