scholarly journals Bio-Based Thermo-Reversible Aliphatic Polycarbonate Network

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 74 ◽  
Author(s):  
Pierre-Luc Durand ◽  
Etienne Grau ◽  
Henri Cramail
Keyword(s):  
Thermal Stability ◽  
Biomedical Applications ◽  
Diels Alder ◽  
Cross Linking ◽  
Important Class ◽  
Aliphatic Polycarbonate ◽  
Biomedical Field ◽  
The Cross ◽  
Thermal Stability Of

Aliphatic polycarbonates represent an important class of materials with notable applications in the biomedical field. In this work, low Tg furan-functionalized bio-based aliphatic polycarbonates were cross-linked thanks to the Diels–Alder (DA) reaction with a bis-maleimide as the cross-linking agent. The thermo-reversible DA reaction allowed for the preparation of reversible cross-linked polycarbonate materials with tuneable properties as a function of the pendent furan content that was grafted on the polycarbonate backbone. The possibility to decrosslink the network around 70 °C could be an advantage for biomedical applications, despite the rather poor thermal stability of the furan-functionalized cross-linked polycarbonates.

Characterization of Thermal Reversible Cross-Linking Agents for Flexible Poly(vinyl chloride)

2014 ◽  
Vol 900 ◽  
pp. 3-6 ◽  
Author(s):  
Jing Wang ◽  
Wei Fang ◽  
Yuan Yuan ◽  
Xiao Ming Liu
Keyword(s):  
Thermal Stability ◽  
Vinyl Chloride ◽  
Congo Red ◽  
Cross Linking ◽  
Gel Content ◽  
Ethyl Mercaptan ◽  
Poly Vinyl Chloride ◽  
The Cross ◽  
Thermal Stability Of

In order to improve thermal stability of Poly (Vinyl Chloride), a kind of thermal reversible cross-linking agents, the end cyclopentadienyl ethanethiol salts, sodium cyclopentadienyl ethyl mercaptan (CPD-C2H4SNa) was synthesized in this paper. The DSC results proved that the prepared CPD-C2H4SNa has obvious thermal reversible characteristics and the thermal reversible temperature was at 177 °C. The effects of cross-linking agent amount, cross-linking reactive time and temperature on flexible PVC compounds were evaluated through gel content testing. It was showed that the cross-linking agent with 3 Phr is optimum for PVC compounds. Moreover, both the cross-linking reactive time and temperature has effects on gel content of PVC compounds. The gel content of CPD-C2H4SNa cross-linked PVC compounds reaches maximum at 76% for 20 min at 160 °C.The static thermal stability of flexible PVC was measured according to congo red method. The results showed that the thermal stability of PVC compounds was enhanced with increasing cross-linking agent amount.

scholarly journals Synthesis, Optimization, Property, Characterization, and Application of Dialdehyde Cross-Linking Guar Gum

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Tang Hongbo ◽  
Li Yanping ◽  
Zhang Wen ◽  
Dong Siqing
Keyword(s):  
Thermal Stability ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Guar Gum ◽  
Sodium Periodate ◽  
Decomposition Temperature ◽  
Melting Enthalpy ◽  
Cross Linking ◽  
The Cross ◽  
Thermal Stability Of

Dialdehyde cross-linking guar gum (DCLGG), as a novel material, was synthesized using phosphorus oxychloride as a cross-linking reagent, sodium periodate as an oxidant, and ethanol as a solvent through keeping the original particle form of guar gum. The process parameters such as the reaction temperature, reaction time, pH, amount of sodium periodate, and amount of ethanol were optimized by the response surface methodology in order to obtain the regression model of the oxidization. The covalent binding of L-asparagine onto the surfaces of DCLGG was further investigated. The results showed that the best technological conditions for preparing DCLGG were as follows: reaction temperature = 40°C, reaction time = 3.0 h, pH = 4.0, and amount of ethanol = 74.5%. The swelling power of DCLGG was intermediate between cross-linking guar gum and dialdehyde guar gum. The cross-linking and dialdehyde oxidization reduced the viscosity of GG. The cross-liking reduced the melting enthalpy of GG. However, the oxidization increased melting enthalpy of ACLGG. The thermal stability of GG was increased by cross-linking or oxidization. The variation of the onset decomposition temperature and end decomposition temperature of GG was not consistent with thermal stability of GG. L-asparagine could be chemically bound well by DCLGG through forming Schiff base under the weak acidity. The maximum adsorption capacity of L-asparagine on DCLGG with aldehyde content of 56.2% reached 21.9 mg/g.

Cross-linking of atoms and thermal stability of new MDF compositions

1996 ◽  
Vol 46 (2) ◽  
pp. 479-487 ◽  
Author(s):  
M. Drábik ◽  
Lubica Gáliková ◽  
Zuzana Sadleková ◽  
Mária Kubranová
Keyword(s):  
Thermal Stability ◽  
Cross Linking ◽  
Thermal Stability Of

scholarly journals Improving the Color Stability of Naturally Colored Silk by Cross-Linking the Sericin with Phytic Acid

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Mingbo Ma ◽  
Pirah Ayaz ◽  
Wanhui Jin ◽  
Wenlong Zhou
Keyword(s):  
Phytic Acid ◽  
Color Stability ◽  
Constant Level ◽  
Cross Linking ◽  
Color Fastness ◽  
Cross Link ◽  
Biomedical Field ◽  
The Cross

The color of naturally colored silk (NCS) fades easily during home washing due to the loss of pigment accompanied by dissolution of the sericin. In this study, phytic acid was used to cross-link the sericin of NCS and reduce its solubility, aiming at improving the color fastness of NCS to repeated washing. It was found that the sericin-fixing effect increased as the concentration of phytic acid to 1.0 wt% and the cross-linking time to 5 h increased and then reached a constant level. Cross-linking at pH 7.0-8.5 and temperature 30-40°C could obtain relatively good sericin-fixing effects. The cross-linked NCS showed low sericin loss during the degumming and had much better color fastness to repeated washing as compared with the samples before cross-linking. The cross-linking method proposed in this study may be not only a kind of solution for improving the color fastness of NCS with high practicality but also an alternative for cross-linking sericin-based materials in the biomedical field.

scholarly journals Effect of Nanodiamond Particles on Properties of Epoxy Composites

2008 ◽  
Vol 17 (1) ◽  
pp. 096369350801700 ◽  
Author(s):  
Zdeno Špitalský ◽  
Alexander Kromka ◽  
Libor Matějka ◽  
Peter Černoch ◽  
Jana Kovářová ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Epoxy Composites ◽  
Neat Epoxy ◽  
Light Transmittance ◽  
Cross Linking ◽  
Amino Groups ◽  
Multiwalled Carbon ◽  
Epoxy Network ◽  
Epoxy Nanocomposite ◽  
Thermal Stability Of

The epoxy nanocomposites filled with 0.1, 0.5, and 1 wt% nanodiamonds (nanoD) were prepared and their properties were compared with neat epoxy network or epoxy nanocomposite filled with 1 wt% multiwalled carbon nanotubes (MWCNTs). The obtained nanoD-epoxy composites increased significantly thermal stability of prepared nanocomposites in comparison with neat epoxy matrix. The exponential decay of light transmittance with increasing concentration of nanoD in sample was observed. The values of storage modulus G` and glass transition temperature Tg significantly decreased by addition of nanoD to epoxy network. This is caused by inhibition of cross-linking reaction of epoxy- and amino- groups by nanoD.

Influence of the Precursor Cross-Linking Route on the Thermal Stability of Si−B−C−O Ceramics

2008 ◽  
Vol 20 (22) ◽  
pp. 7148-7156 ◽  
Author(s):  
Vladislav Ischenko ◽  
Eckhard Pippel ◽  
Jörg Woltersdorf ◽  
B. Rodrigue Ngoumeni Yappi ◽  
Ralf Hauser ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Cross Linking ◽  
Thermal Stability Of

Diels–Alder “click” chemistry for the cross-linking of furfuryl-gelatin-polyetheramine hydrogels

RSC Advances ◽  
2014 ◽  
Vol 4 (67) ◽  
pp. 35578 ◽  
Author(s):  
C. García-Astrain ◽  
A. Gandini ◽  
C. Peña ◽  
I. Algar ◽  
A. Eceiza ◽  
...  
Keyword(s):  
Click Chemistry ◽  
Diels Alder ◽  
Cross Linking ◽  
The Cross

Study on Physicochemical Properties of Tilapia Skin Collagen Scaffold Cross-Linked by EDC

2012 ◽  
Vol 538-541 ◽  
pp. 2232-2235
Author(s):  
Zhou Wei Duan ◽  
Xuan Ri Shen ◽  
Peng Li ◽  
Guang Hua Xia ◽  
Zhe Liu
Keyword(s):  
Thermal Stability ◽  
Physicochemical Properties ◽  
Water Uptake ◽  
Collagen Scaffold ◽  
Cross Linking ◽  
Shrinkage Temperature ◽  
Skin Collagen ◽  
The Cross ◽  
The Difference ◽  
Temperature Water

In order to improve physicochemical properties of Tilapia skin collagen (TSC), 1-ethyl-3-(3-dimethyl amino-propyl)-carbodiimide (EDC) was used as a cross-linking agent for TSC matrices. The difference in physicochemical properties between cross-linked and uncross-linked TSC was characterized by measuring shrinkage temperature, water uptake and anti-enzyme effect. The results indicated that, after the cross-linking, the thermal stability was increased; the anti-enzyme effect was improved obviously. It is thus concluded that the EDC cross-linking greatly improve the physicochemical properties of TSC.

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