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Jody L Clements, Daranee Tantbirojn, Antheunis Versluis, David R Cagna
STATEMENT OF PROBLEM: Denture tooth fracture may limit the longevity of dental prostheses. Whether the strength of the denture tooth material is affected by the denture processing technique is unclear. PURPOSE: The purpose of this in vitro study was to investigate whether the denture processing technique affects the mechanical properties of denture tooth materials. MATERIAL AND METHODS: Two denture processing techniques, injection and compression molding, were tested for 3 types of denture teeth: nanohybrid composite (NHC), interpenetrating network (IPN), and microfiller-reinforced polyacrylic (MRP)...
March 15, 2018: Journal of Prosthetic Dentistry
Loredana Elena Nita, Aurica P Chiriac, Alina Gabriela Rusu, Maria Bercea, Alina Diaconu, Nita Tudorachi
The interpenetrating polymer networks (IPNs) are promising materials due to their unique properties. In this context, in the present study, new IPN structures based on poly(dimethylaminoethyl methacrylate) (PDMAEMA) and poly(itaconic anhydride-co-3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5] undecane) (PITAU) were synthesized. The double network was prepared by synthesizing and crosslinking (with N, N'-methylenebis(acrylamide)) PDMAEMA in the presence of a preformed PITAU network. The effect of the two components upon some properties such us: viscoelasticity, thermal stability and swelling behavior of the new prepared gels were deeply investigated...
June 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Yizhi Zhuo, Verner Håkonsen, Zhiwei He, Senbo Xiao, Jianying He, Zhiliang Zhang
Ice accretion presents a severe risk for human safety. Despite great efforts for developing icephobic surfaces (the surface with an ice adhesion strength below 100 kPa) have been devoted, expanding the lifetime of state-of-the-art icephobic surfaces still remains as a critical unsolved issue. Herein, a novel icephobic material is designed by integrating interpenetrating polymer network (IPN) into autonomous self-healing elastomer, and applied in anti-icing for enhancing mechanical durability. The molecular structure, surface morphology, mechanical properties and durable icephobicity of the material were studied...
March 16, 2018: ACS Applied Materials & Interfaces
Lan Ma, Peiyi Wu
Well-defined poly(N-isopropylacrylamide)/poly(tributylhexylphosphonium 3-sulfopropylmethacrylate) (PNIPAM/P[P4,4,4,6 ][MC3S]) interpenetrating polymer network (IPN) microgels were synthesized by two-step precipitation polymerization, and the thermally induced phase transition mechanism of IPN microgels was investigated using dynamic light scattering (DLS), temperature-dependent IR spectroscopy together with the perturbation correlation moving window (PCMW) technique and two dimensional correlation spectroscopy (2Dcos)...
March 8, 2018: Physical Chemistry Chemical Physics: PCCP
Yuliana Rosas Hernández, Luz Arcelia García Serrano, Daniel Tapia Maruri, Antonio Ruperto Jiménez Aparicio, Brenda Hildeliza Camacho Díaz, Martha Lucia Arenas-Ocampo
About 150 species of Agave genus exist in Mexico, including Agave angustifolia Haw, which is used mainly in the agroindustry for producing alcoholic beverages such as mescal, and for obtaining fructan macromolecules (agavin), during the manufacturing process, a by-product, known as bagasse, is formed. Oaxaca's mescal industry produces about 122,696 tons per year of bagasse (Martinez et al, 2013), likewise, this by-product is also formed in a process where macromolecules are obtained in the Center for Development of Biotic Products-IPN (Centro de Desarrollo de Productos Bioticos-IPN (CeProBi-IPN)) (Patent No...
March 7, 2018: Journal of Agricultural and Food Chemistry
Haixiao Wan, Jianxiang Shen, Naishen Gao, Jun Liu, Yangyang Gao, Liqun Zhang
Designing a multiple-network structure at the molecular level to tailor the mechanical properties of polymeric materials is of great scientific and technological importance. Through the coarse-grained molecular dynamics simulation, we successfully construct an interpenetrating polymer network (IPN) composed of a flexible polymer network and a stiff polymer network. First, we find that there is an optimal chain stiffness for a single network (SN) to achieve the best stress-strain behavior. Then we turn to study the mechanical behaviors of IPNs...
March 5, 2018: Soft Matter
Kaijuan Chen, Xiao Kuang, Vincent Li, Guozheng Kang, H Jerry Qi
3D printing of epoxy-based shape memory polymers with high mechanical strength, excellent thermal stability and chemical resistance is highly desirable for practical applications. However, thermally cured epoxy in general is difficult to print directly. There have been limited numbers of successes in printing epoxy but they suffer from relatively poor mechanical properties. Here, we present an ultraviolet (UV)-assisted 3D printing of thermally cured epoxy composites with high tensile toughness via a two-stage curing approach...
February 20, 2018: Soft Matter
Sahar Sultan, Aji P Mathew
3-Dimensional (3D) printing provides a unique methodology for the customization of biomedical scaffolds with respect to size, shape, pore structure and pore orientation useful for tissue repair and regeneration. 3D printing was used to fabricate fully bio-based porous scaffolds of a double crosslinked interpenetrating polymer network (IPN) from a hydrogel ink of sodium alginate and gelatin (SA/G) reinforced with cellulose nanocrystals (CNCs). CNCs provided favorable rheological properties required for 3D printing...
February 16, 2018: Nanoscale
Surinder Singh Rana, Rajesh Gupta, Mandeep Kang, Vishal Sharma, Ravi Sharma, Ujjwal Gorsi, Deepak K Bhasin
Background and Objectives: Infected pancreatic necrosis (IPN) in the early phase is treated with "step up approach" involving initial percutaneous catheter drainage (PCD) followed by necrosectomy. There is a paucity of data on a combined approach of initial PCD followed by endoscopic drainage and necrosectomy. A retrospectively study on safety and efficacy of initial PCD followed by endoscopic transluminal drainage and necrosectomy in IPN. Methods: Retrospective analysis of data of 23 patients with IPN who were treated with a combined approach...
January 2018: Endoscopic Ultrasound
Kholoud Arafa, Rehab N Shamma, Omaima N El-Gazayerly, Ibrahim M El-Sherbiny
PURPOSE: Metformin hydrochloride (MF) repurposing as adjuvant anticancer therapy for colorectal cancer (CRC) proved effective. Several studies attempted to develop MF-loaded nanoparticles (NPs), however the entrapment efficiency (EE%) was poor. Thus, the present study aimed at the facile development of a new series of chitosan (CS)-based semi-interpenetrating network (semi-IPN) NPs incorporating Pluronic ® nanomicelles as nanocarriers for enhanced entrapment and sustained release of MF for efficient treatment of CRC...
February 12, 2018: Drug Development and Industrial Pharmacy
Se Yeon Song, Min Soo Park, Jung Woo Lee, Ji Sun Yun
Silane coupling agents (SCAs) with different organofunctional groups were coated on the surfaces of Al₂O₃ ceramic particles through hydrolysis and condensation reactions, and the SCA-coated Al₂O₃ ceramic particles were dispersed in a commercial photopolymer based on interpenetrating networks (IPNs). The organofunctional groups that have high radical reactivity and are more effective in UV curing systems are usually functional groups based on acryl, such as acryloxy groups, methacrloxy groups, and acrylamide groups, and these silane coupling agents seem to improve interfacial adhesion and dispersion stability...
February 7, 2018: Nanomaterials
A Michael Rajesh, Kiritkumar Mangaldas Popat
The objective of this study was to carry out taste masking of ofloxacin (Ofl) by ion exchange resins (IERs) followed by sustained release of Ofl by forming interpenetrating polymer network (IPN) beads. Drug-resin complexes (DRCs) with three different ratios of Ofl to IERs (1:1, 1:2, 1:4) were prepared by batch method and investigated for in vivo and in vitro taste masking. DRC of methacrylic acid-divinyl benzene (MD) resin and Ofl prepared at a ratio of 1:4 was used to form IPN beads. IPN beads of MD 1:4 were prepared by following the ionic cross-linking method using sodium carboxymethyl xanthan gum (SCMXG) and SCMXG-sodium carboxymethyl cellulose (SCMXG-SCMC)...
August 2017: Journal of Pharmaceutical Analysis
Rajesh Kumar Padhan, Saransh Jain, Samagra Agarwal, Suresh Harikrishnan, Padmaprakash Vadiraja, Sanatan Behera, Sushil Kumar Jain, Rajan Dhingra, Nihar Ranjan Dash, Peush Sahni, Pramod Kumar Garg
OBJECTIVE: The aim of this study was to study the development of early and late organ failure (OF) and their differential impact on mortality in patients with acute pancreatitis (AP). METHODS: Consecutive patients (N = 805) with acute pancreatitis were included in an observational study. Organ failure was categorized as primary if it occurred early due to pancreatitis per se and secondary if it occurred late due to infected pancreatic necrosis (IPN). Primary outcome was a relative contribution of primary OF, secondary OF, and IPN to mortality...
March 2018: Pancreas
Xiao Kuang, Kaijuan Chen, Conner K Dunn, Jiangtao Wu, Vincent C F Li, H Jerry Qi
3D printing of flexible and stretchable materials with smart functions such as shape memory and self-healing is highly desirable for the development of future 4D printing technology for myriad applications, such as soft actuators, deployable smart medical devices, and flexible electronics. Here, we report a novel ink that can be used for 3D printing of highly stretchable, shape memory and self-healing elastomer via UV light assisted direct-ink-write (DIW) printing. An ink containing urethane diacrylate and a linear semi-crystalline polymer is developed for 3D printing of a semi-interpenetrating polymer network (semi-IPN) elastomer that can be stretched by up to 600%...
February 5, 2018: ACS Applied Materials & Interfaces
Hajime Tanabe, Yujiro Higuchi, Jun-Hui Yuan, Akihiro Hashiguchi, Akiko Yoshimura, Satoshi Ishihara, Satoshi Nozuma, Yuji Okamoto, Eiji Matsuura, Hiroyuki Ishiura, Jun Mitsui, Ryotaro Takashima, Norito Kokubun, Kengo Maeda, Yuri Asano, Yoko Sunami, Yu Kono, Yasunori Ishigaki, Shosaburo Yanamoto, Jiro Fukae, Hiroshi Kida, Mitsuya Morita, Shoji Tsuji, Hiroshi Takashima
Mutations in small heat shock protein beta-1 (HspB1) have been linked to Charcot-Marie-Tooth (CMT) disease type 2F and distal hereditary motor neuropathy type 2B. Only four cases with HSPB1 mutations have been reported to date in Japan. In this study between April 2007 and October 2014, we conducted gene panel sequencing in a case series of 1,030 patients with inherited peripheral neuropathies (IPNs) using DNA microarray, targeted resequencing, and whole-exome sequencing. We identified HSPB1 variants in 1.3 % (13 of 1,030) of the patients with IPNs, who exhibited a male predominance...
January 30, 2018: Journal of the Peripheral Nervous System: JPNS
Sayan Ganguly, Subhadip Mondal, Poushali Das, Poushali Bhawal, Priti Prasanna Maity, Sabyasachi Ghosh, Santanu Dhara, Narayan Ch Das
Soft biomaterials derived from polysaccharides are generally suffers from lack of mechanical robustness and instability. The naturally occurring highly abundance low cost polysaccharide has immense aspect as biomaterial after functionalization which can be designed as stretchable and rubber-like elastic with reversible ductility. A highly swellable, stretchable, low creep, non-cytotoxic nanocomposite hydrogel has been fabricated by simple one-pot Michael type covalent grafting of acrylic acid based copolymer onto psyllium biomacromolecular chian by free radical gelation technique...
January 20, 2018: International Journal of Biological Macromolecules
Leila Khatami, Fariba Khodagholi, Fereshteh Motamedi
The Interpedundular nucleus (IPN) is a small midbrain structure located deeply between the two cerebral peduncles. The strategic placement of this nucleus makes it a possible relay between structures involved in the modulation of hippocampal theta rhythm activity. In this study we aimed to investigate how reversible inactivation of IPN could affect the acquisition, consolidation and retrieval phases of memory in passive avoidance (PA) and Morris water maze (MWM) tasks. To support our data, molecular studies were performed in order to detect possible changes in the expression of proteins related to learning and memory in the hippocampus...
January 17, 2018: Behavioural Brain Research
Janne Ta Mäkelä, Benjamin G Cooper, Rami K Korhonen, Mark W Grinstaff, Brian D Snyder
OBJECTIVE: Depletion of glycosaminoglycans (GAGs) and degradation of collagen network are early hallmarks of osteoarthritis. Currently, there are no chondroprotective therapies that mitigate the loss of GAGs or effectively restore the collagen network. Recently, a novel polymeric cartilage supplement was described that forms a charged interpenetrating polymer network (IPN) reconstituting the hydrophilic properties of the extracellular matrix. To investigate the mechanism by which this hydrophilic IPN improves articular cartilage material properties, a finite element (FE) model is used to evaluate the IPN's effect on the fibrillar collagen network, nonfibrillar matrix, and interstitial fluid flow...
January 8, 2018: Osteoarthritis and Cartilage
Yen-Hao Lin, Tsung-Chi Lee, Yu-Sheng Hsiao, Wei-Keng Lin, Wha-Tzong Whang, Chun-Hua Chen
P-phenediamino-modified graphene (PDG) has been newly synthesized via a facile green one-step chemical route as a functionalized graphene-based additive to copolymerize with aniline for fabricating innovative PDG/polyaniline conducting polymer composites (PDG/PANI) containing very special semi-interpenetrating networks (S-IPNs). The S-IPNs which not only provide additional pathways by creating chemically-bonded PDG and PANI for smoothly transporting carriers, but greatly reduce the amount of graphene required to less than a few percent could effectively improve the overall electric conductivity and thus the thermoelectric performance...
January 10, 2018: ACS Applied Materials & Interfaces
Faheem Ullah, Fatima Javed, Mbh Othman, Abbas Khan, Rukhsana Gul, Zulkifli Ahmad, Hazizan Md Akil
Addressing the functional biomaterials as next-generation therapeutics, chitosan and alginic acid were copolymerized in the form of chemically crosslinked interpenetrating networks (IPNs). The native hydrogel was functionalized via carbodiimide (EDC), catalyzed coupling of soft ligand (1,2-Ethylenediamine) and hard ligand (4-aminophenol) to replace -OH groups in alginic acid units for extended hydrogel- interfaces with the aqueous and sparingly soluble drug solutions. The chemical structure, Lower solution critical temperature (LCST ≈ 37...
December 29, 2017: Journal of Biomaterials Science. Polymer Edition
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