Preparation and properties of bifunctional associative polymer with twin tail and long chain structure for shale gas fracturing

2021 ◽  
Author(s):  
Cheng yu Zhou ◽  
Ming yao Lei ◽  
Min Zhou ◽  
Ling hao Zeng ◽  
Yuan Sun ◽  
...  
Keyword(s):  
Shale Gas ◽  
Chain Structure ◽  
Associative Polymer ◽  
Long Chain

Interpretation of long-chain structure from dilute solution properties of ultrahigh molecular weight polymers

1992 ◽  
Vol 27 (5) ◽  
pp. 571-575 ◽  
Author(s):  
Maria Bercea ◽  
Silvia Ioan ◽  
Bogdan C. Simionescu ◽  
Cristofor I. Simionescu
Keyword(s):  
Molecular Weight ◽  
Chain Structure ◽  
Solution Properties ◽  
Dilute Solution ◽  
Dilute Solution Properties ◽  
Ultrahigh Molecular Weight ◽  
Long Chain

Predictions of the ability of solution dynamics experiments to characterize long-chain structure in flexible homopolymers

1988 ◽  
Vol 21 (11) ◽  
pp. 3273-3285 ◽  
Author(s):  
Robert L. Sammler ◽  
John L. Schrag
Keyword(s):  
Chain Structure ◽  
Solution Dynamics ◽  
Long Chain

scholarly journals Synthesis and Fluorescent Properties of Novel Mono- and Di-Substituted 1,8-Naphthalimide Derivatives at the C-4 Position

2017 ◽  
Author(s):  
Ying Fu ◽  
Xiao-Xiao Pang ◽  
Kui Wang ◽  
Zhi-Qiang Wang ◽  
Guan-Yu Li ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Chain Structure ◽  
Fluorescence Properties ◽  
Stacking Interactions ◽  
Fluorescent Properties ◽  
Enhanced Fluorescence ◽  
Pi Stacking ◽  
Molecular Core ◽  
Long Chain

A series of novel N-n-butyl-1,8-naphthalimide derivatives were synthesized via a three-step reaction involving nucleophilic substitution and acylation. All of the compounds were characterized by IR, 1H NMR, 13C NMR, MS, and elemental analysis, and the crystal structure of N-n-butyl-4-[N’,N’-bis(2`,4`-dichlorobenzoyl)ethylamino]-1,8-naphthalimide was determined. The π-π stacking interactions and hydrogen bonds between the two molecular core planes (naphthalimide ring) and the van der Waals forces between the flexible n-butyl groups resulted in a 3D long-chain structure. The UV-vis and fluorescence properties of the title compounds were investigated. The results indicated that the monosubstituted 1,8-naphthalimide derivatives bearing an electron-donating group on the benzene ring or a structure with a larger conjugative effect exhibited enhanced fluorescence properties.

scholarly journals Novel Nanocomposites Based on Bacterial Polyester/LDH-SDS Clay for Stem Cells Delivery in Modern Wound Healing Management

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4488
Author(s):  
Eugeniu Vasile ◽  
Ionut-Cristian Radu ◽  
Bianca Galateanu ◽  
Maria Rapa ◽  
Ariana Hudita ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Stem Cells ◽  
Wound Healing ◽  
Sodium Dodecyl ◽  
Young Modulus ◽  
Chain Structure ◽  
Nanocomposite Materials ◽  
Two Phases ◽  
Double Hydroxides ◽  
Long Chain

Nanocomposite materials based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) and modified mineral clay layered double hydroxides (LDH-SDS) were explored as novel nanostructured materials for potential tissue engineering applications. The mineral clay inorganic phase was modified with an anionic long-chain structure of carbon atoms, such as sodium dodecyl sulfate, in order to increase the compatibility between the two phases. The melt intercalation method used for nanocomposite fabrication ensures a good dispersion of the modified LDH-SDS within the polymer matrix without using a toxic solvent (chloroform). The nanocomposites were found to have an intercalated/exfoliated structure with an enhanced Young modulus and increased stiffness. This could allow them to be considered for autologous stem cells dressings in the view of efficient wound healing applications.

scholarly journals A Tough, Water-Resistant, High Bond Strength Adhesive Derived from Soybean Meal and Flexible Hyper-Branched Aminated Starch

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1352 ◽  
Author(s):  
Yi Zhang ◽  
Jieyu Zhang ◽  
Mingsong Chen ◽  
Jing Luo ◽  
Sheldon Q. Shi ◽  
...  
Keyword(s):  
Bond Strength ◽  
Soybean Meal ◽  
Water Resistance ◽  
Crosslinking Agent ◽  
Crosslinking Density ◽  
Chain Structure ◽  
High Bond ◽  
High Bond Strength ◽  
Branched Structure ◽  
Long Chain

Soybean meal (SM)-based adhesive exhibited a great potential to replace petroleum-derived ones to alleviate the energy crisis and eliminate carcinogenic formaldehyde. However, the bad water resistance (caused by low crosslinking density) and inherent brittleness of SM adhesive severely hindered its application. However, improving crosslinking density is generally accompanied by a toughness reduction of the adhesive. Herein, we developed a flexible long-chain starch with a hyper-branched structure (HD), and incorporated it with SM and a crosslinking agent to prepare a novel SM adhesive. Results showed that this adhesive exhibited both excellent water resistance and enhanced toughness. The wet bond strength of plywood fabricated using this adhesive was 354.5% higher than that of SM adhesive. These achievements are because introducing HD with hyper-branched groups enhanced crosslinking density, while HD’s flexible long-chain structure improved toughness of the adhesive. This HD can promote the development of tough and hydrophobic bio-based composites.

scholarly journals A further X-ray investigation of long chain compounds (n-hydrocarbon)

1928 ◽  
Vol 120 (785) ◽  
pp. 437-459 ◽  
Keyword(s):  
Crystal Structure ◽  
Stearic Acid ◽  
Single Crystals ◽  
Cross Section ◽  
Structure Factor ◽  
Chain Structure ◽  
Practical Reasons ◽  
X Ray ◽  
Chain Compounds ◽  
Long Chain

In a previous paper the writer has outlined the crystal structure of a number of long-chain compounds. One of the main results of this work was to show that the crystal molecules (chains) in all these substances can be represented as rods of definite cross section, the crystals being built up of bundles of these rods packed close together. A closer examination of the X-ray photographs of stearic acid gave the clue to the chain structure, and led to a general formula for the structure factor. It was then announced that a more detailed investigation of stearic acid was to follow. The choice of stearic acid was dictated entirely by practical reasons, no other well developed crystals of other similar substances being available at that time. But as it was obviously more desirable to study first the prototype of the long chain compounds, namely, the normal hydrocarbon, efforts were first made to find single crystals of these substances. The search was unexpectedly successful, and the present paper describes an attempt to interpret the results of the X-ray examination of a single crystal of the hydrocarbon C 29 H 60 .

Synthesis of Hierarchically Porous Zeolite Composites with Enhanced Catalytic Activity: Effect of Different Long-Chain Structure Directing Agents

2018 ◽  
Vol 18 (3) ◽  
pp. 1730-1737 ◽  
Author(s):  
He Ding ◽  
Yixiao Zhang ◽  
Zixing Xiao ◽  
Jingshuang Zhang ◽  
Peng Bai ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Chain Structure ◽  
Hierarchically Porous ◽  
Activity Effect ◽  
Structure Directing Agents ◽  
Long Chain

Interpretation of long-chain structure in flexible homopolymers from dilute-solution dynamic properties measured in good solvents

1989 ◽  
Vol 22 (8) ◽  
pp. 3435-3442 ◽  
Author(s):  
Robert L. Sammler ◽  
John L. Schrag
Keyword(s):  
Dynamic Properties ◽  
Chain Structure ◽  
Dilute Solution ◽  
Long Chain

scholarly journals Microscopic Analysis of the Rejuvenation Mechanism and Rejuvenation Effect of Asphalt Binders

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Ke Shan ◽  
Chonghao Bao ◽  
Dandan Li ◽  
Chuanfeng Zheng
Keyword(s):  
Aromatic Ring ◽  
Small Molecule ◽  
Mean Square Displacement ◽  
Microscopic Analysis ◽  
Chain Structure ◽  
Ring Structure ◽  
Asphalt Binders ◽  
Microscopic Mechanism ◽  
Aged Asphalt ◽  
Long Chain

This study investigates the rejuvenation mechanism of asphalt binders at the microscopic level and compares the rejuvenation effects of rejuvenators. A model of rejuvenated asphalt was established on the basis of molecular simulation by adding different doses of two rejuvenators to the aged asphalt. This model was validated in terms of density and surface free energy. The diffusion ability of the rejuvenator was investigated by using a diffusion model and mean square displacement. The deagglomeration ability of rejuvenators on asphaltene was explored by using a radial distribution function. The microscopic mechanism of asphalt rejuvenation was explained. Results show that small molecule structures are more diffusible than long-chain structures, and aromatic ring structures are more attracted than polar functional groups. The rejuvenating effect of the rejuvenator was evaluated in terms of viscosity and cohesive energy density. Results show that the long-chain structure reduces the viscosity value more than the small molecule structure. The aromatic ring structure in the aged asphalt helps to restore the compatibility between the fractions. This study serves as a guide for the selection and development of future rejuvenators.

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