Graft modification in bamboo cellulose nanofibrils: An effective option to improve compatibility and tunable surface energy

2021 ◽  
Author(s):  
Carlos Alejandro Rodríguez-Ramírez ◽  
Alain Dufresne ◽  
Norma Beatriz D'Accorso ◽  
Nancy Garcia
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Cellulose Nanofibrils ◽  
Value Added ◽  
Xrd Analysis ◽  
Low Molecular Weight ◽  
Mechanical And Thermal Properties ◽  
Graft Modification ◽  
Effective Option ◽  
20 Nm

Abstract In this work, from an endemic and non-significant value-added bamboo argentine, nanofibrils (CNFs) of 20 nm in width were obtained. These nanofibrils were chemical modified in surface with three simple steps using a noncommercial low molecular weight polylactic acid. The success of modification was confirmed by FTIR, TGA, DSC and XRD analysis. The modified nanofibrils were taken up for changing surface properties in films based on commercial PLA. The results show that dispersive (γ D/S) component of films increase of 34.7 mN/m to 36.1 mN/m after the addition of modified nanofibrils from 2 to 5% in formulation of the films, comparing with a physical blend. Interesting others result in physical, mechanical, and thermal properties of the nanocomposites, were reported.

Synthesis and characterization of an extractive-based bio-epoxy resin from beetle infested Pinus contorta bark

2014 ◽  
Vol 16 (7) ◽  
pp. 3483-3493 ◽  
Author(s):  
Pei-Yu Kuo ◽  
Mohini Sain ◽  
Ning Yan
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Pinus Contorta ◽  
Tree Bark ◽  
Synthesis And Characterization ◽  
Low Molecular Weight ◽  
Mechanical And Thermal Properties

The cured bio-epoxy resins synthesized from low molecular weight tree bark extractives displayed good mechanical and thermal properties.

scholarly journals Investigating Lignin-Derived Monomers and Oligomers in Low-Molecular-Weight Fractions Separated from Depolymerized Black Liquor Retentate by Membrane Filtration

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2887
Author(s):  
Kena Li ◽  
Jens Prothmann ◽  
Margareta Sandahl ◽  
Sara Blomberg ◽  
Charlotta Turner ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Performance ◽  
Membrane Filtration ◽  
Black Liquor ◽  
Complex Mixture ◽  
Value Added ◽  
Kraft Pulping ◽  
Classification Model ◽  
Low Molecular Weight ◽  
Chemical Complexity

Base-catalyzed depolymerization of black liquor retentate (BLR) from the kraft pulping process, followed by ultrafiltration, has been suggested as a means of obtaining low-molecular-weight (LMW) compounds. The chemical complexity of BLR, which consists of a mixture of softwood and hardwood lignin that has undergone several kinds of treatment, leads to a complex mixture of LMW compounds, making the separation of components for the formation of value-added chemicals more difficult. Identifying the phenolic compounds in the LMW fractions obtained under different depolymerization conditions is essential for the upgrading process. In this study, a state-of-the-art nontargeted analysis method using ultra-high-performance supercritical fluid chromatography coupled to high-resolution multiple-stage tandem mass spectrometry (UHPSFC/HRMSn) combined with a Kendrick mass defect-based classification model was applied to analyze the monomers and oligomers in the LMW fractions separated from BLR samples depolymerized at 170–210 °C. The most common phenolic compound types were dimers, followed by monomers. A second round of depolymerization yielded low amounts of monomers and dimers, while a high number of trimers were formed, thought to be the result of repolymerization.

Mechanical and thermal properties of graphene oxide/ultrahigh molecular weight polyethylene nanocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 63063-63072 ◽  
Author(s):  
Wenchao Pang ◽  
Zifeng Ni ◽  
Guomei Chen ◽  
Guodong Huang ◽  
Huadong Huang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Graphene Oxide ◽  
Thermal Properties ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Mechanical And Thermal Properties ◽  
Hummers Method ◽  
Ultrahigh Molecular Weight ◽  
Uhmwpe Composites ◽  
Modified Hummers Method

Graphene oxide (GO) was prepared according to a modified Hummers method, and a range of GO/ultrahigh molecular weight polyethylene (UHMWPE) composites were fabricated then their mechanical and thermal properties were investigated.

Influence of two novel compatibilizers on the properties of LDPE/organoclay nanocomposites

2014 ◽  
Vol 34 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Haydar U. Zaman ◽  
Dalour Hossen Beg
Keyword(s):  
Molecular Weight ◽  
Tensile Modulus ◽  
Low Molecular Weight ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Melt Mixing ◽  
Nucleation Effect ◽  
Transmission Electron ◽  
Linear Viscoelastic ◽  
Silicate Clay

Abstract In the present investigation, low density polyethylene (LDPE)/organoclay nanocomposites with various clay contents (1–7 wt%) were prepared via a melt mixing technique, using two different compatibilizers with various contents; low molecular weight trimethoxysilyl-modified polybutadiene (Organosilane) and low molecular weight oxidized polyethylene (OxPE). The effects of incorporation of compatibilizers and clay contents on the mechanical and thermal properties of the nanocomposites were investigated. The dispersibility of silicate clay in the nanocomposites was investigated by transmission electron microscopy (TEM). It was found that organosilane yielded better clay dispersion and a more exfoliated structure compared with the OxPE. Rheological behavior of the samples was examined by a dynamic oscillatory rheometer in the linear viscoelastic region. The organosilane compatibilized system conferred higher tensile strength, yield strength and tensile modulus than those of an uncompatibilized system, and even higher than those of the OxPE compatibilized case. The crystallization behaviors of uncompatibilized and compatibilized nanocomposites were investigated using differential scanning calorimetry (DSC). DSC results indicated that the addition of compatibilizers increased the crystallization temperature (Tc) as a result of heterogeneous nucleation effect of clay on LDPE.

Coupling Agents for Certain Types of Fluoroelastomers

1978 ◽  
Vol 51 (5) ◽  
pp. 897-906 ◽  
Author(s):  
J. W. Martin ◽  
T. V. Braswell ◽  
H. E. Green
Keyword(s):  
Molecular Weight ◽  
Coupling Agent ◽  
Coupling Agents ◽  
Low Molecular Weight ◽  
Mechanical And Thermal Properties ◽  
Effective Performance ◽  
Base Polymer ◽  
Service Conditions ◽  
Carbon Fillers ◽  
First Time

Abstract From the data presented in this paper, it is concluded that fillers can be coupled with certain types of fluoroelastomer base polymers. A useful coupling agent must have mechanical and thermal properties at least equivalent to the base polymer in order to provide an improvement in properties for the compound under extreme service conditions. For the particular case of peroxide-curable fluoroelastomers and carbon fillers, hydroxy-terminated low-molecular-weight polybutadienes with high 1,2-microstructure appear to be good coupling agents. Care must be exercised in selecting the peroxide level to obtain a high crosslink density of the coupling agent while retaining rubberlike properties of the compound. This type of polybutadienediol has a relatively high number of reactive vinyl groups (approximately 20 per molecule) and relatively high molecular weight. Based upon the hypotheses presented in this paper, that coupling between carbon black and fluoroelastomers has been demonstrated for the first time, both higher molecular weight and multifunctionality of the polybutadienediol are viewed as important characteristics for effective performance.

Bridging Anti-Coagulation with Low-Molecular-Weight Heparin in HVAD Patients - A Safe and Effective Option

2017 ◽  
Vol 36 (4) ◽  
pp. S250
Author(s):  
B. Schrage ◽  
J. Braetz ◽  
A. Bernhardt ◽  
M. Rybczynski ◽  
M. Barten ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight Heparin ◽  
Low Molecular Weight ◽  
Effective Option
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