Synthesis and Evaluation of Bifunctional Monomers Derived from Post-Industrial PET as Crosslinking Agents for Acrylic Monomers

2014 ◽  
Vol 976 ◽  
pp. 59-63
Author(s):  
Antonio Cruz-Aguilar ◽  
Juan Coreño-Alonso ◽  
Ana María Herrera González
Keyword(s):  
Double Bond ◽  
Acryloyl Chloride ◽  
Thermal Stabilities ◽  
Pet Waste ◽  
Acrylic Monomers ◽  
Double Bond Conversion ◽  
Bifunctional Monomer ◽  
Ft Ir ◽  
Post Industrial ◽  
Crosslinking Agents

Two bifunctional monomers, bis (acryloxyethyl) terephthalate (BAOET) and bis (allyloxycarboniloxyethyl) terephthalate (BAOCOET), derived from PET waste were tested as crosslinking agents for acrylic and methacrylic acids (AA and MA, respectively). BAOET and BAOCOET were obtained from the reactions of acryloyl chloride and allyl chloroformate, respectively, with bis (hydroxyethyl) terephthalate (BHET). This was obtained from the glycolysis of postindustrial PET with ethyleneglycol (EG). Both bifunctional monomers were characterized by NMR 1H. Polymerizations of BAOET and BAOCOET with the acrylic monomers were performed using bifunctional monomer to acrylic monomer weight ratios of 1:10, 1:2 and 1:1, for each of the four combinations, using 2 wt % of benzoyl peroxide (BPO) as thermal initiator. The obtained gel proportions of the crosslinked polymers were above 90% for most of the cases, requiring times from 10 to 60 min. For all of the experiments, complete double bond conversion was observed by FT-IR. Polymers showed thermal stabilities higher than 200°C.

scholarly journals Adhesive Resins with High Shelf-Life Stability Based on Tetra Unsaturated Monomers with Tertiary Amines Moieties

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1944
Author(s):  
Alma Antonia Pérez-Mondragón ◽  
Carlos Enrique Cuevas-Suárez ◽  
Jesús García-Serrano ◽  
Nayely Trejo-Carbajal ◽  
A. Lobo-Guerrero ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Double Bond ◽  
Shelf Life ◽  
Polymerization Rate ◽  
Tertiary Amines ◽  
Adhesive Systems ◽  
Double Bond Conversion ◽  
Initiator System ◽  
Ft Ir ◽  
Shelf Life Stability

This work reports the use of two monomers with two tertiary amines and four methacrylic (TTME) or acrylic (TTAC) terminal groups as co-initiators in the formulation of experimental resin adhesive systems. Both monomers were characterized by FT-IR and 1H NMR spectroscopies. The control adhesive was formulated with BisGMA, TEGDMA, HEMA, and the binary system CQ-EDAB as a photo-initiator system. For the experimental adhesives, the EDAB was completely replaced for the TTME or the TTAC monomers. The adhesives formulated with TTME or TTAC monomers achieved double bond conversion values close to 75%. Regarding the polymerization rate, materials formulated with TTME or TTAC achieved lower values than the material formulated with EDAB, giving them high shelf-life stability. The degree of conversion after shelf simulation was only reduced for the EDAB material. Ultimate tensile strength, translucency parameter, and micro-tensile bond strength to dentin were similar for control and experimental adhesive resins. Due to their characteristics, TTME and TTAC monomers are potentially useful in the formulation of photopolymerizable resins for dental use with high shelf-life stability.

scholarly journals Synthesis and Characterization of New Polyimide by Curing Poly Acryloyl Chloride with Different Amides

2013 ◽  
Vol 10 (3) ◽  
pp. 686-698
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thermal Analysis ◽  
Uv Spectroscopy ◽  
Synthesis And Characterization ◽  
Acryloyl Chloride ◽  
Melting Points ◽  
Thermal Stabilities ◽  
Ft Ir ◽  
Ethyl Amine ◽  
Structure Confirmation

The present work involved preparation of new substituted and unsubstituted and poly imides (1-17) using reaction of acryloyl chloride with different amides (aliphatic ,aromatic) in the presence of a suitable solvent and amount tri ethyl amine (Et3N) with heating – the structure confirmation of all polymers were proved using FT-IR,1H-NMR,C13NMR and UV spectroscopy ,thermal analysis (TG) for some polymers confirmed their thermal stabilities . Other physical properties including softening and melting points, PH and solubility of the polymers were also measured

Silaethene XVI [1]. Bildung und Reaktivität der Silaethene Me(Vi)Si=CHCH2tBu und Vi2Si=CHCH2tBu / Silaethenes XVI [1]. Formation and Reactivity of the Silaethenes Me(Vi)Si=CHCH2tBu and Vi2Si=CHCH2tBu

1994 ◽  
Vol 49 (8) ◽  
pp. 1101-1114 ◽  
Author(s):  
Joseph Grobe ◽  
Harald Ziemer
Keyword(s):  
Double Bond ◽  
Low Temperatures ◽  
Indirect Detection ◽  
Separation Procedure ◽  
Thermal Stabilities ◽  
Ft Ir

The reactions of Vi2(Me)SiCl or Vi3SiCl with tBuLi in pentane solution at low temperatures (-78 to 20 °C) are governed by the addition of tBuLi to one of the vinyl groups, followed by LiCl elimination to yield the silaethenes Vi(Me)Si=CHNp (1) and Vi2Si=CHNp (2), re­spectively. The following reactions of 1 and 2 without or with trapping reagents have been studied in some detail. Both silaethenes undergo dimerization with formation of 1,3-disilacyclobutane derivatives, in case of 2 accompanied by trimers. A surprise is the generation of the disilanes Vi(Me)Si(CH=CHtBu)Si(Me)Vi(CH2CH2tBu) (3) and Vi2Si(CH=CHtBu)SiVi2(CH2CH2tBu) (17) very probably by intermolecular ene-type reac­tions. With DMB or isoprene as trapping agents [4 + 2]-cycloadducts 11, 14, 15, 21, ene-pro- ducts 10, 13 and substitution products 12, 22 are obtained. A very efficient indirect detection of 1 and 2 has been achieved with Me3SiOMe as quenching reagent, which gives excellent yields of the adducts Vi(Me)Si(OMe)CH(SiMe3)Np (16, 91%) and Vi2Si(OMe)CH(SiMe3)Np (23, 76%). respectively. Problems in the characterization of iso­mer mixtures arise from difficulties in the GC separation procedure and from the limited thermal stabilities of some of the products. 1 and 2 are very similar with respect to the reactivity of the Si=C double bond, but differ considerably in their tendency to undergo polymerization which is connected to the number of vinyl groups. Therefore, the yields of the typical Si=C products is drastically reduced in the case of 2. In spite of separation pro­blems most of the products have been characterized by a combination of GC/MS. GC/FT-IR and NMR measurements.

Preparation and Properties of Silicon-Containing Arylacetylene Resins with Octa(maleimidophenyl)silsesquioxane

2012 ◽  
Vol 557-559 ◽  
pp. 1152-1156
Author(s):  
Yan Zhou ◽  
Fu Wei Huang ◽  
Fa Rong Huang ◽  
Lei Du
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Thermal Polymerization ◽  
Curing Process ◽  
Thermal Stabilities ◽  
Curing Reaction ◽  
Air Atmosphere ◽  
Ft Ir ◽  
Dsc Analyses

Modified silicon-containing arylacetylene resins (DMSEPE-OMPS) were prepared from poly(dimethylsilyleneethynylenephenyleneethynylene) (DMSEPE) and Octa(maleimidophenyl)- silsesquioxane (OMPS). The curing reaction of DMSEPE-OMPS resin was studied by FT-IR and DSC techniques. Thermal stability and dielectric properties of cured DMSEPE-OMPS resins were determined. FT-IR and DSC analyses indicate that thermal polymerization of DMSEPE-OMPS resin occurs in the curing process. Thermal stabilities of cured DMSEPE-OMPS resins under N2 and air atmosphere decrease gradually with the increment of OMPS components. The incorporation of OMPS can obviously reduce dielectric constant of DMSEPE-OMPS resins.

Grafting of Chitosan: Structural, Thermal and Antimicrobial Properties

2019 ◽  
Vol 41 (2) ◽  
pp. 240-240
Author(s):  
Nevin Cankaya Nevin Cankaya
Keyword(s):  
Antimicrobial Activity ◽  
Graft Copolymers ◽  
Thermo Gravimetric Analysis ◽  
Antimicrobial Properties ◽  
Gravimetric Analysis ◽  
Analysis Method ◽  
Methacryloyl Chloride ◽  
Thermo Gravimetric ◽  
Thermal Stabilities ◽  
Ft Ir

In this study, some new chitosan materials were synthesized by the grafting of chitosan with the monomers such as 1-vinylimidazole (VIM), methacrylamide (MAm) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). First of all, chitosan methacrylate was prepared by esterification of primary -OH group with methacryloyl chloride a 25.13% yield by mole. The monomers were grafted into chitosan methacrylate via free radical polymerization using 2,2and#39;-Azobisisobutyronitrile as an initiator in N,N-dimethylformamide. The graft copolymers were characterized by FT-IR spectra and elemental analysis. Thermal stabilities of the graft copolymers were determined by TGA (thermo gravimetric analysis) method. The synthesized chitosan methacrylate and its graft copolymers were tested for their antimicrobial activity against bacteria and yeast.

Synthesis of two PET waste derived bisacrylic and bisallylic monomers and their potential use as crosslinking agents and dental resin composites

2014 ◽  
Vol 132 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Juan Coreño Alonso ◽  
Antonio Cruz Aguilar ◽  
Carlos Enrique Cuevas-Suárez ◽  
Rosa Ángeles Vázquez García ◽  
Ana María Herrera-González
Keyword(s):  
Resin Composites ◽  
Dental Resin ◽  
Pet Waste ◽  
Dental Resin Composites ◽  
Potential Use ◽  
Crosslinking Agents

scholarly journals An investigation on the optical properties of regioregular Poly(3-Hexylthiophene)

2014 ◽  
Vol 17 (2) ◽  
pp. 86-92
Author(s):  
Lam Le ◽  
Tuan Anh Luu
Keyword(s):  
Optical Properties ◽  
Optical Sensors ◽  
Field Effect Transistors ◽  
Gel Permeation Chromatography ◽  
Semiconducting Polymers ◽  
Organic Field Effect Transistors ◽  
Thermal Stabilities ◽  
Smart Windows ◽  
Regioregular Poly ◽  
Ft Ir

Among semiconducting polymers, poly(3-alkylthiophene)s have attracted great attention and generated many studies over the past few years. Among them, regioregular (head-to-tail) poly(3-hexylthiophene) (P3HT) has been especially investigated due to its superior opto-electronic properties, good solubility in the most common organic solvents, chemical and thermal stabilities and also very low toxicity. These properties enable P3HT to be significantly useful in a large variety of applications such as optical sensors, smart windows, organic field effect transistors (OFETs), electrochromic devices, and solar cells. Here, we report the synthesis of poly(3-hexylthiophene) (P3HT) and investigate the optical properties of P3HT in different solvents such as chloroform, tetrahydrofuran, toluene, ethylacetate. The structures of P3HT were confirmed by nuclear magnetic resonance (1H NMR), gel permeation chromatography (GPC), Fourier transform infrared (FT-IR).

scholarly journals Depth-Related Curing Potential of Ormocer- and Dimethacrylate-Based Bulk-Fill Composites

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6753
Author(s):  
Ramona S. Oltramare ◽  
Reto Odermatt ◽  
Phoebe Burrer ◽  
Thomas Attin ◽  
Tobias T. Tauböck
Keyword(s):  
Double Bond ◽  
Repeated Measures ◽  
In Vitro Study ◽  
High Viscosity ◽  
Degree Of Conversion ◽  
Double Bond Conversion ◽  
Nanohybrid Composite ◽  
Post Hoc ◽  
One Way Anova

The aim of this in vitro study was to investigate the degree of C=C double bond conversion of high-viscosity dimethacrylate- or ormocer-based bulk-fill composites as a function of measurement depth. Four bulk-fill composites (Tetric EvoCeram Bulk Fill, x-tra fil, SonicFill, and Bulk Ormocer) and the conventional nanohybrid composite Tetric EvoCeram were applied in standardized Class II cavities (n = 6 per group) and photoactivated for 20 s at 1350 mW/cm2. The degree of conversion of the composites was assessed using Fourier-transform infrared spectroscopy at seven measurement depths (0.15, 1, 2, 3, 4, 5, 6 mm). Data were analyzed using repeated measures ANOVA and one-way ANOVA with Bonferroni post-hoc tests (α = 0.05). The investigated bulk-fill composites showed at least 80% of their maximum degree of conversion (80% DCmax) up to a measuring depth of at least 4 mm. Tetric EvoCeram Bulk Fill and Bulk Ormocer achieved more than 80% DCmax up to a measuring depth of 5 mm, x-tra fil up to 6 mm. The conventional nanohybrid composite Tetric EvoCeram achieved more than 80% DCmax up to 3 mm. In contrast to the conventional composite, the investigated ormocer- and dimethacrylate-based bulk-fill composites can be photo-polymerized in thick layers of up to at least 4 mm with regard to their degree of C=C double bond conversion.

scholarly journals Synthesis of N-benzothiazole derivative imide on polymeric chain, have possible biological activity

2013 ◽  
Vol 10 (3) ◽  
pp. 673-685
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thermal Analysis ◽  
Biological Activity ◽  
Melting Point ◽  
13C Nmr ◽  
Uv Spectroscopy ◽  
Polymeric Chain ◽  
Thermal Stabilities ◽  
Triethyl Amine ◽  
Ft Ir ◽  
Structure Confirmation

In this reserch Some new substituted and unsubstituted poly imides compounds. were synthesized by reaction of acrylol chloride with different amides (aliphatic and aromatic) in a suitable solvent in the presence amount triethyl amine (Et3N) with heating. The Structure confirmation of all polymers were confirmed using FT-IR,1H-NMR,13C-NMR and UV spectroscopy. Thermal analysis (TG) for some polymers showed their thermal stabilities. Other physical properties including softening points, melting point and solubility of the polymers were also measured

Research on Crystallinity, Morphology of Cotton Subjected to Enzyme and Crosslinking Treatment

2017 ◽  
Vol 893 ◽  
pp. 71-76 ◽  
Author(s):  
Md. Nahid Pervez ◽  
Faizan Shafiq ◽  
Muhammad Munib Jilani ◽  
Zahid Sarwar ◽  
Ying Jie Cai
Keyword(s):  
Crystalline Structure ◽  
Cotton Fiber ◽  
Crystallinity Index ◽  
Cotton Fibers ◽  
Cellulose I ◽  
X Ray ◽  
Cotton Fibres ◽  
Ft Ir ◽  
Crystalline Nature ◽  
Crosslinking Agents

This paper explores the effect of prior enzymatic treatment on non-formaldehyde crosslinked cotton fiber and crystalline structure of cotton fibers after enzyme, crosslinking and a combination of enzyme and crosslinking treatments were examined by X-ray diffractometer. Results showed that during crosslinking treatment crystallinity index (%) values were increased with reduced crystallinity size and crosslinked of enzyme treated cotton did not change the crystalline nature of cotton (i.e. it was Cellulose I). In addition, by analysing FT-IR and SEM data it is confirmed that uniform presence of crosslinking agents was visible on cotton fibres.

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