Preparation, Cross-Linking and Characterization of Novel Benzocyclobutene-Siloxane Polymers with Polysiloxane Mainchain and Silylbenzocyclobutene Pendant Groups

2012 ◽  
Vol 534 ◽  
pp. 178-183 ◽  
Author(s):  
Hui Ling Li ◽  
Ya Wen Hang ◽  
Ke Cao ◽  
Fang Hua Zhu ◽  
Jun Xiao Yang
Keyword(s):  
Ring Opening ◽  
Decomposition Temperature ◽  
Cross Linking ◽  
Initial Decomposition Temperature ◽  
Hydrosilylation Reaction ◽  
On Line ◽  
Ft Ir ◽  
Siloxane Polymers ◽  
Incorporation Ratio

A series of BCB-siloxane polymers with benzocyclobutene (BCB) pendant groups and polysiloxane mainchain was prepared by the hydrosilylation reaction between 4-(1,1-di-methyl-1-vinyl) silylbenzocyclobutene (4-DMVSBCB) and poly (methylhydrosiloxane) (PHMS) employing Pt/C as catalyst. Upon heating the BCB-siloxane polymers, the cross-linking occurred via ring-opening of benzocyclobutene as evidenced by on-line FT-IR, 1H NMR and 13C NMR. TGA examination indicates that the thermal stability was enhanced with increasing the incorporation ratio of BCB. Most importantly, the initial decomposition temperature of crosslinked BCB-siloxane resins is as high as 429 oC, showing a superior thermal resistance over most other BCB resins.

Synthesis and Characterization of a Novel Linear Benzoxazine-Containing Polytriazole via Metal-Free Click Reaction and its Self-Crosslinking Behavior

2012 ◽  
Vol 557-559 ◽  
pp. 973-978
Author(s):  
Zhong Yi Xu ◽  
Lei Du ◽  
Li Qiang Wan ◽  
Fa Rong Huang
Keyword(s):  
Click Reaction ◽  
Decomposition Temperature ◽  
Linear Polymer ◽  
The Novel ◽  
Metal Free ◽  
Crosslinked Polymer ◽  
Degradation Behaviors ◽  
Ft Ir ◽  
Increasing Temperature

A novel linear benzoxazine-containing polytriazole was successfully synthesized via metal-free click reaction. Benefited from the advantages of click reaction, the synthesis procedure was easily and efficiently. The linear polymer could be transformed into crosslinked structure after ring-opening polymerization of oxazine induced by the increasing temperature. The FT-IR characterization verified the structure transformation between linear and crosslinked polymer. Moreover, the thermal properties and thermal degradation behaviors of linear polymer and the corresponding crosslinked polymer were studied by DSC and TGA. The novel polytriazole was proved to be a kind of thermal stable polymers with high thermal decomposition temperature (Td5over 300°C).

Structure and Properties of Modifier for Heat Transfer Printing on Cotton Fabric

2011 ◽  
Vol 331 ◽  
pp. 426-429
Author(s):  
Yi Mu ◽  
Lan Wang ◽  
Ming Hua Wu ◽  
Jun Xiong Lin
Keyword(s):  
Heat Transfer ◽  
Spherical Shape ◽  
Decomposition Temperature ◽  
Polymerization Process ◽  
Structure And Properties ◽  
Transfer Printing ◽  
Transmission Electron ◽  
Ft Ir ◽  
Regular Spherical Shape

Modifier for heat transfer printing on cotton fabrics was prepared by semi-continuous emulsion polymerization process with butyl acrylate (BA), styrene (St), acrylonitrile (AN) and cross-linking monomer. FT-IR characterization of modifier groups showed that individual monomer well carried out polymerization. Transmission electron microscopy (TEM) photos demonstrated that latex particles had regular spherical shape and uniform distribution. TGA curves indicated that thermal decomposition temperature of modifier was 439 oC. As for the transfer printing products had good colour fastness, high transfer rate and no formaldehyde.

scholarly journals The Synthesis of Magnesium Soaps as Feed for Biohydrocarbon Production

2018 ◽  
Vol 156 ◽  
pp. 03001 ◽  
Author(s):  
Meiti Pratiwi ◽  
Godlief F. Neonufa ◽  
Tirto Prakoso ◽  
Tatang H. Soerawidjaja
Keyword(s):  
Coconut Oil ◽  
Decomposition Temperature ◽  
Direct Reaction ◽  
Initial Decomposition Temperature ◽  
Process Yield ◽  
Palm Stearine ◽  
Metal Soaps ◽  
Amorphous Surface ◽  
Great Potency

In previous study, by heating magnesium basic soaps from palm stearine will decarboxylated and produced biohydrocarbon. The frequent method to produced metal soaps from triglyceride in laboratory scale is metathesis. This process is less favored because this method would produced large amounts of salt waste and hard to develop into bigger scale. This study investigated the process and characterization of magnesium soaps from coconut oil and magnesium hydroxide via direct reaction method at 185 °C for 3 and 6 hours. The resulting soaps were washed with water and methanol, then dried. This process yield more than 80%-w metal soaps, acid values lower than 6 mg KOH/g and pH 9.2. Based on Thermogravimetry Analysis (TGA) and SEM results, the initial decomposition temperature of these metal soaps were at 300 °C and have amorphous surface morphology. From decarboxylation test of magnesium basic soaps indicate great potency as feed for biohydrocarbon production.

Study on Synthesis and Characterization of Unsaturated Polyester by Enzyme-Catalyzed

2013 ◽  
Vol 575-576 ◽  
pp. 67-70
Author(s):  
Fen Juan Shao ◽  
Qun Yang ◽  
Lan Ying Li ◽  
Da Nian Lu
Keyword(s):  
High Temperature ◽  
Unsaturated Polyester ◽  
Soxhlet Extraction ◽  
Side Chain ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Cross Link ◽  
H Nmr ◽  
Ft Ir

Unsaturated polyester was prepared with adipic acid (AA), fumaric acid (FA), itaconic acid (IA) and 1, 6-hexanediol (HD) by enzyme-catalyzed polmerization. The insoluble gel fraction (Qs), as the cross-linking degree of cured unsaturated polyesters which could be self-cross-linked at high temperature through C=C in it, was got by Soxhlet Extraction. The properties were investigated by FT-IR, 1H NMR, DSC, XRD and so on. The results indicated that the C=C in unsaturated diacids reduced the acitvity of N435, which affected the polmerization. With the introduction of C=C of IA or FA, the Mn of polyester reduced. The C=C could self-cross-link under high temperature for lengthy time. The higher the temperature and the longer the time, the Qs increased. As the C=C of IA was in the side chain, it could move easily. Then Qs of poly (AA-co-IA-co-HD) was higher than ploy (AA-co-FA-co-HD). With the increased content of unsaturated diacid, Qs increased. And the biodegradation of cross-linked polyesters became worse.

scholarly journals Synthesis of poly(γ-tert-butyl L-glutamate): influence of polymerization conditions

2019 ◽  
Vol 16 (3) ◽  
pp. 25
Author(s):  
Phung Thi Thuy Dung ◽  
Nguyen Thi Le Thu
Keyword(s):  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Attenuated Total Reflection ◽  
Resonance Spectroscopy ◽  
Reaction Conditions ◽  
Tert Butyl ◽  
Ft Ir ◽  
Hydrolysis Of ◽  
Polymerization Conditions

This work presents the synthesis and characterization of poly(γ-tert-butyl L-glutamate) (PtBuLG) via a living ring-opening polymerization procedure of γ-tert-butyl L-glutamate N-carboxyanhydride (tBuLG-NCA). The reaction conditions were investigated to optimize the polymerization yield and molecular weight polydispersity. The synthesized PtBuLG was characterized using nuclear magnetic resonance spectroscopy (NMR), gel permeation chromatography (GPC) and attenuated total reflection-Fourier transform infrared (ATR FT-IR. Finally, hydrolysis of PtBuLG resulted in poly(L-glutamic acid) (PLGA).

scholarly journals Selective Production of Acetic Acid via Catalytic Fast Pyrolysis of Hexoses over Potassium Salts

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 502
Author(s):  
Wenyue Kang ◽  
Zhijun Zhang
Keyword(s):  
Acetic Acid ◽  
Mass Loss Rate ◽  
Maximum Yield ◽  
Potassium Acetate ◽  
Decomposition Temperature ◽  
Initial Decomposition Temperature ◽  
Chemical Catalysis ◽  
On Line ◽  
Maximum Mass Loss

Glucose and fructose are widely available and renewable resources. They were used to prepare acetic acid (AA) under the catalysis of potassium acetate (KAc) by thermogravimetric analysis (TGA) and pyrolysis coupled with gas chromatography and mass spectrometry (Py-GC/MS). The TGA result showed that the KAc addition lowered the glucose’s thermal decomposition temperatures (about 30 °C for initial decomposition temperature and 40 °C for maximum mass loss rate temperature), implying its promotion of glucose’s decomposition. The Py-GC/MS tests illustrated that the KAc addition significantly altered the composition and distribution of hexose pyrolysis products. The maximum yield of AA was 52.1% for the in situ catalytic pyrolysis of glucose/KAc (1:0.25 wt/wt) mixtures at 350 °C for 30 s. Under the same conditions, the AA yield obtained from fructose was 48% and it increased with the increasing amount of KAc. When the ratio reached to 1:1, the yield was 53.6%. In comparison, a study of in situ and on-line catalytic methods showed that KAc can not only catalyze the primary cracking of glucose, but also catalyze the cracking of a secondary pyrolysis stream. KAc plays roles in both physical heat transfer and chemical catalysis.

Synthesis, Characterization of P(CH/AA-co-AM) and Adsorptive Removal of Pb (II) ions from Aqueous Solution: Thermodynamic Study

2021 ◽  
Vol 19 (7) ◽  
pp. 137-143
Author(s):  
Aseel M Aljeboree ◽  
Rasha Amer Mohammed ◽  
Makarim A. Mahdi ◽  
Layth S. Jasim ◽  
Ayad F. Alkaim
Keyword(s):  
Acrylic Acid ◽  
Measured Data ◽  
Cross Linking ◽  
Adsorptive Removal ◽  
Freundlich Equation ◽  
Endothermic Process ◽  
Ft Ir ◽  
Structural Surface ◽  
Increasing Temperature

Cross-linking Chitosan/Poly (Acryl amide-Acrylic acid) Hydrogel (P(CH/AA-co-AM)) synthesized via free radical polymerization of Acrylamide and acrylic acid as monomers after that addition chitosan, using MBA and KPS as initiator. The produced materials' structural, surface, and thermal properties were determined using the following techniques: FT-IR, TGA, TEM, and FE-SEM. This study is concerned with a significant application of surface chemistry in the fields of removing heavy metals. It deals with the adsorption-systems of Pb (II) on Cross-linking Chitosan / Poly (Acrylic acid-Acryl amide) Hydrogel at variable conditions of concentration and temp. The measured data are following the Freundlich equation and, according to the Giles classification, the adsorption isotherms are of type S3. As a temperature feature (10, 20, 25 and 30oC), adsorption was investigated. With increasing temperature (endothermic process), the extent of adsorption of Pb (II)on P(CH / AA-co-AM) was found for increase. They have also measured the essential thermodynamic functions.

On-Line Characterization of Vehicle Emissions by FT-IR and Mass Spectrometry

1981 ◽  
Author(s):  
James W. Butler ◽  
Paul D. Maker ◽  
Thomas J. Korniski ◽  
Larry P. Haack
Keyword(s):  
Mass Spectrometry ◽  
Vehicle Emissions ◽  
On Line ◽  
Ft Ir

Preparation and Characterization of Hydrogels Based on Chitsoan/Polyvinyl Alcohol Blends

2015 ◽  
Vol 1105 ◽  
pp. 203-207
Author(s):  
Mohammed Amine Zitouni ◽  
Sofia Borsali Kara Slimane
Keyword(s):  
Weight Ratio ◽  
Poly Vinyl Alcohol ◽  
Cross Linking ◽  
Scanning Calorimetry ◽  
Intermolecular Hydrogen Bonds ◽  
Sem Images ◽  
Structure Morphology ◽  
Ft Ir ◽  
Scanning Electron

In this study, a series of poly (vinyl alcohol) (PVA)/chitosan (CS) hydrogels with different weight ratio of PVA to CS were prepared by freezing-thawing (F-T) method. The structure, morphology, and crystallinity of hydrogels were investigated by Fourier Transform Infrared (FT-IR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). FTIR demonstrated the presence of strong intermolecular hydrogen bonds between CS and PVA molecules. SEM images showed that the higher the chitosan, the greater the porous size of the hydrogel and DSC confirmed that crystallinity is higher when PVA is more in hydrogel. The mechanical properties of these hydrogels were studied by rheometry. The study of swelling ability demonstrated that the hydrogel developed with PVA and Cs was more swellable than that with PVA only because of its cross-linking interaction with PVA.

A Novel Method for Functionalization of Polypropylene with Oligomer of Glycidyl Methacrylate: Characterization of Copolymers

2006 ◽  
Vol 11-12 ◽  
pp. 733-736 ◽  
Author(s):  
Shu Jun Liang ◽  
Jian Ping Deng ◽  
Lian Ying Liu ◽  
Wan Tai Yang
Keyword(s):  
Free Radicals ◽  
Glycidyl Methacrylate ◽  
Crystal Form ◽  
Organic Peroxide ◽  
Decomposition Temperature ◽  
Initial Decomposition Temperature ◽  
Photo Polymerization ◽  
Novel Approach ◽  
Novel Method

A novel approach to functionalize polypropylene (PP) is presented. This method consists of two steps. Firstly, oligomers of glycidyl methacrylate (GMA) were synthesized via UV photo-polymerization using benzophenone (BP) as initiator. Secondly, the GMA oligomers were grafted onto PP, which was initiated by the free radicals generated through the reactivation of semipinacol dormant groups in the oligomers. By this method, the functionalization of PP could be facilely achieved in a simple system without either organic peroxide initiator or monomer; additionally, degradation of the substrate PP was not observed. This presentation is mainly focused on the characterization of the grafted PP products by XRD, DSC and TGA measurements. It is demonstrated that the melting temperature, crystallinity and the initial decomposition temperature of the grafted PP were all increased, compared with those of the origin PP; the functionalization of PP led to the change of the crystal form from the mixed form of α and β into only α form.

Sign in / Sign up

Export Citation Format

Share Document