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article

Century-long expansion of hydrating cement counteracting concrete shrinkage due to humidity drop from selfdesiccation or external drying

Saeed Rahimi-Aghdam, Enrico Masoero, Mohammad Rasoolinejad, Zdeněk P. Bažant

Materials and Structures > 2019 > 52 > 1 > 1-21

A physically based model for auotgenous shrinkage and swelling of portland cement paste is necessary for computation of long-time hydgrothermal effects in concrete structures. The goal is to propose such a model. As known since 1887, the volume of cement hydration products is slightly smaller than the original volume of cement and water (chemical shrinkage). Nevertheless, this does not imply that...

article

Synthesis of ITQ-2 Zeolites and Catalytic Performance in n-Dodecane Cracking

Jiangge Hao, Ying Wang, Guozhu Liu, Jingwen Zhang, more

Chinese Journal of Chemical Engineering > 2014 > 22 > 8 > 869-874

ITQ-2 zeolites were prepared by sequential alkali-swelling and ultrasonic-delamination of precursor MCM-22 and characterized by X-ray powder diffraction, scanning electron microscopy, nitrogen adsorption–desorption, ammonia temperature-programmed desorption and in-situ Fourier-transform infrared spectroscopy. The delamination induced a change in the morphology of ITQ-2 zeolites from aggregated thin...

article

Exposure of natural rubber to personal lubricants – swelling and stress relaxation as potential indicators of reduced seal integrity of non-lubricated male condoms

Srilekha Sarkar Das, James C. Coburn, Charles Tack, Matthew R. Schwerin, more

Contraception > 2014 > 90 > 1 > 86-93

Background: Male condoms act as mechanical barriers to prevent passage of body fluids. For effective use of condoms the mechanical seal is also expected to remain intact under reasonable use conditions, including with personal lubricants. Absorption of low molecular weight lubricant components into the material of male condoms may initiate material changes leading to swelling and stress relaxation...

article

Synthesis and adsorption behaviors of poly(2-(dimethylamino)ethyl methacrylate) brushes on silica particles by surface-initiated atom transfer radical polymerization

Wanzhu Zhou, Hui Liu, Hongqi Ye, Huanqing Cui, more

Powder Technology > 2013 > 249 > Complete > 1-6

Poly(2-(dimethylamino)ethyl methacrylate) brushes on the surface of silica particles were synthesized by surface-initiated atom transfer radical polymerization. The resulting brushes were analyzed and characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), thermo-gravimetric analysis (TGA) and X-ray photoelectron spectrometer (XPS). Equilibrium swelling ratio...

article

Swelling characteristics of GMZ bentonite and its mixtures with sand

De'an Sun, Jinyi Zhang, Junran Zhang, Long Zhang, more

Applied Clay Science > 2013 > 83-84 > Complete > 224-230

Gaomiaozi (GMZ) bentonite produced in Inner Mongolia has been chosen as a matrix material of buffer/backfill materials in the deep geological disposal to isolate the high level radioactive waste in China. Swelling characteristics of GMZ bentonite and bentonite–sand mixtures inundated with distilled water were studied by experimental methods. The test result shows that the relation between the void...

article

Reversible Modulation of Plasmonic Coupling of Gold Nanoparticles Confined within Swellable Polymer Colloidal Spheres

Zuyang Ye, Chen Chen, Licheng Cao, Zepeng Cai, more

Angewandte Chemie International Edition > 63 > 35 > n/a - n/a

Dynamic optical modulation in response to stimuli provides exciting opportunities for designing novel sensing, actuating, and authentication devices. Here, we demonstrate that the reversible swelling and deswelling of crosslinked polymer colloidal spheres in response to pH and temperature changes can be utilized to drive the assembly and disassembly of the embedded gold nanoparticles (AuNPs), inducing...

article

Reversible Modulation of Plasmonic Coupling of Gold Nanoparticles Confined within Swellable Polymer Colloidal Spheres

Zuyang Ye, Chen Chen, Licheng Cao, Zepeng Cai, more

Angewandte Chemie > 136 > 35 > n/a - n/a

Dynamic optical modulation in response to stimuli provides exciting opportunities for designing novel sensing, actuating, and authentication devices. Here, we demonstrate that the reversible swelling and deswelling of crosslinked polymer colloidal spheres in response to pH and temperature changes can be utilized to drive the assembly and disassembly of the embedded gold nanoparticles (AuNPs), inducing...

article

A comprehensive review on active chain density evaluation from swelling and insights for better accounting for insoluble particles

Grégoire Delahaye, Adrien Redon, Benoît Ruellan, Isabelle Jeanneau, more

Journal of Applied Polymer Science > 141 > 35 > n/a - n/a

The present study provides a state of the art on methods for evaluating active chain density of rubbers from swelling experiments. This review focuses more particularly on the effects of components that are known to limit the swelling, and which typically results in an overestimation of the active chain density. These components are commonly considered as insoluble. Different corrections dealing with...

article

Phase behavior of rubber and supercritical CO₂: Operating parameters and swelling characteristics

Xiang Li, Xiaoqing Deng, Jianxin Liu, Xiaolei Zhang

Polymer Engineering & Science > 64 > 8 > 3473 - 3487

This study aims to compare the difference in the swelling process between styrene butadiene rubber (SBR) and natural rubber (NR) in ScCO₂. A high‐pressure visual stainless‐steel autoclave was used to carry out swelling measurements based on the sample dimensions. The swelling rates for both rubbers followed a first‐order kinetic model. The diffusion coefficient for CO₂ was determined from the change...

article

Profile control and oil displacement in high temperature and salinity reservoirs: Evaluation of deformable microgel system

Hossein Pahlevani, Mahsa Baghban Salehi, Farzin Saghandali, Rouzbeh G. Moghanloo, more

Polymers for Advanced Technologies > 35 > 8 > n/a - n/a

Viscoelastic microgels have been successfully used as profile control and enhanced oil recovery agents in oil reservoirs. In this paper, a novel microgel made of acrylamide monomer and 2‐Acrylamido‐2‐methylpropane sulfonic acid was synthesized using inverse emulsion polymerization. The spherical shape of microgel particles and their corresponding size distribution were confirmed by series of microscopic...

article

Sustainable, Low‐Cost Sorbents Based on Calcium Chloride‐Loaded Polyacrylamide Hydrogels

Levi Hoogendoorn, Mauricio Huertas, Phillip Nitz, Naiyu Qi, more

Advanced Functional Materials > 34 > 29 > n/a - n/a

Sorbents are promising materials for applications in atmospheric water harvesting, thermal energy storage, and passive cooling, thereby addressing central challenges related to water scarcity and the global energy transition. Recently, hygroscopic hydrogel composites have emerged as high‐performance sorbents. However, many of these systems are fabricated with unsustainable and costly sorbent materials,...

article

Construction of self‐healing gallium (III)‐cross‐linked konjac glucomannan/polyacrylamide hydrogels for efficiently killing bacteria and accelerating wound healing

Zhi‐Hao Xu, Ping Sun, Xue Zhang, Jia‐Yin Zhang, more

Journal of Applied Polymer Science > 141 > 32 > n/a - n/a

Gallium ions have a special action mechanism that interferes bacterial iron metabolism, thereby possessing great potential for the treatment of bacterial infections. In this work, gallium ions‐cross‐linked konjac glucomannan/polyacrylamide (KGM/PAM/Ga³⁺) hydrogels are successfully constructed with satisfactory swelling ability, appropriate mechanical properties and adjustable degradation performance...

article

Cure characteristics and mechanical properties of natural rubber vulcanizates filled with untreated pyrolytic tire char

Duangkamol Dechojarassri, Warissara Suwannakit, Panu Danwanichakul

Journal of Applied Polymer Science > 141 > 31 > n/a - n/a

Untreated pyrolytic tire char was used in natural rubber (STR20) composites as single filler at loadings of 30–70 phr and co‐filler with carbon black (N330) at a total loading of 50 phr. The results were compared with rubbers filled with N330 and crumb rubber at 30 phr. The effects of fillers on cure characteristic, crosslink density, filler dispersion in natural rubber vulcanizates and their mechanical...

article

Investigation of swelling degree of polypropylene beads with monomers and blowing agents

Stefanni S. Everton, Marcos Gusmão, Bruno F. Oechsler, Carlos A. Castor, more

Polymer Engineering & Science > 64 > 7 > 3399 - 3413

The swelling step of polymer particles or beads with blowing agents and monomers is one of the factors that directly affect the performance properties of expandable core–shell particles, including morphology, composition, and expansion degree. In this regard, the present work investigated the effect of swelling agents on polypropylene (PP) beads. Swelling agents were used to perform swelling tests...

article

Preparation of functionalizable poly(propylene–styrene)/polyacrylonitrile millimeter‐scale particles with core‐shell morphology

Danyelle Gurgel, Rosana Oliveira Henriques, Vitor Conradi, Debora Oliveira, more

Journal of Applied Polymer Science > 141 > 29 > n/a - n/a

Core‐Shell (CS) polymeric particles have attracted great interest due to their high mechanical, thermal, and chemical stability and their surface properties. In this study, functionalizable CS poly(propylene/styrene)/poly(acrylonitrile) (PP/PS/PAN) particles were prepared through heterogeneous polymerizations in a batch reactor. Commercial PP particles and PP/PS particles (prepared by seeded suspension...

article

Dual‐Responsive Gradient Structured Actuator via Photopolymerization‐Induced Diffusion

Duygu Sezen Polat, Vera E. Buurman, Dirk J. Mulder, Danqing Liu

Chemistry – A European Journal > 30 > 33 > n/a - n/a

Stimuli‐responsive materials have recently gained significant attention in the field of soft robotics, sensors, and biomimetic devices. The most facile way for the fabrication of such materials remains to endow bilayer structures which are fabricated with the combination of active and passive layers. Although, easily fabricated, these structures suffer from the generation of stress points between...

article

On the Swelling of Polymer Network Strands

Michael Lang, Reinhard Scholz

Macromolecular Rapid Communications > 45 > 10 > n/a - n/a

Large scale computer simulations are employed to analyze the conformations of network strands in polymer networks at preparation conditions (characterized by a polymer volume fraction of ϕ₀) and when swollen to equilibrium (characterized by a polymer volume fraction ϕ < ϕ₀). Network strands in end‐linked model networks are weakly stretched and partially swollen at preparation conditions as compared...

article

The effect of primary closure versus secondary closure techniques on postoperative wound pain in patients undergoing mandibular surgery: A meta‐analysis

Lina Zhang, Lei Li

International Wound Journal > 21 > 4 > n/a - n/a

This research is intended to explore the influence of second and first degree closure methods on the degree of wound pain and swelling of the face following the removal of the mandible. For the purpose of this study, three data sets, including PubMed and Embase, were selected. A separate statistical analysis was conducted on the choice of the trial, the collection of data and the risk of bias. Differences...

article

Impact of Swelling on Macroscopic and Nanoscopic Mechanical Properties of Amphiphilic Polymer Co‐Networks in Non‐Selective and Selective Solvents

Nora Fribiczer, Kevin Hagmann, Carolin Bunk, Frank Böhme, more

Macromolecular Chemistry and Physics > 225 > 6 > n/a - n/a

Amphiphilic polymer gels show environmentally sensitive mechanical properties depending on the solvent polarity, which makes them useful for applications in soft contact lenses, membranes, drug delivery systems, and tissue engineering. To rationally design the material properties for such applications, a sound knowledge about the mechanical properties at different solvency states is necessary. To...

article

A temperature‐responsive dual network hydrogel for reversible smart actuator

Ting Xie, Yi Gao, Zequan Li, Wei Gao

Journal of Applied Polymer Science > 141 > 17 > n/a - n/a

Nowadays, soft actuators have received extensive attention in many application fields, among which hydrogels have become an important choice for constructing soft actuators due to their unique properties. However, the actuating behaviors of hydrogel‐based actuators are usually monotonous due to their unchangeable shapes and structures. Herein, we report a temperature‐responsive hydrogel actuator with...

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Search results

Century-long expansion of hydrating cement counteracting concrete shrinkage due to humidity drop from selfdesiccation or external drying

Synthesis of ITQ-2 Zeolites and Catalytic Performance in n-Dodecane Cracking

Exposure of natural rubber to personal lubricants – swelling and stress relaxation as potential indicators of reduced seal integrity of non-lubricated male condoms

Synthesis and adsorption behaviors of poly(2-(dimethylamino)ethyl methacrylate) brushes on silica particles by surface-initiated atom transfer radical polymerization

Swelling characteristics of GMZ bentonite and its mixtures with sand

Reversible Modulation of Plasmonic Coupling of Gold Nanoparticles Confined within Swellable Polymer Colloidal Spheres

Reversible Modulation of Plasmonic Coupling of Gold Nanoparticles Confined within Swellable Polymer Colloidal Spheres

A comprehensive review on active chain density evaluation from swelling and insights for better accounting for insoluble particles

Phase behavior of rubber and supercritical CO₂: Operating parameters and swelling characteristics

Profile control and oil displacement in high temperature and salinity reservoirs: Evaluation of deformable microgel system

Sustainable, Low‐Cost Sorbents Based on Calcium Chloride‐Loaded Polyacrylamide Hydrogels

Construction of self‐healing gallium (III)‐cross‐linked konjac glucomannan/polyacrylamide hydrogels for efficiently killing bacteria and accelerating wound healing

Cure characteristics and mechanical properties of natural rubber vulcanizates filled with untreated pyrolytic tire char

Investigation of swelling degree of polypropylene beads with monomers and blowing agents

Preparation of functionalizable poly(propylene–styrene)/polyacrylonitrile millimeter‐scale particles with core‐shell morphology

Dual‐Responsive Gradient Structured Actuator via Photopolymerization‐Induced Diffusion

On the Swelling of Polymer Network Strands

The effect of primary closure versus secondary closure techniques on postoperative wound pain in patients undergoing mandibular surgery: A meta‐analysis

Impact of Swelling on Macroscopic and Nanoscopic Mechanical Properties of Amphiphilic Polymer Co‐Networks in Non‐Selective and Selective Solvents

A temperature‐responsive dual network hydrogel for reversible smart actuator

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