Magnetic Polymeric Composites and Gels Containing Magnetite Nanoparticles
Alireza
Mouraki
Iran Polymer and Petrochemical Institute
author
samira
sanjabi
Iran Polymer and Petrochemical Institute
author
Ali REZA
Mahdavian
Iran Polymer and Petrochemical Institute
author
text
article
2018
per
Nowadays and with developments in science and technology of nanomaterials, polymers have displayed new capabilities by addition of inorganic nanoparticles like magnetic substances, besides retaining their natural characteristics. To maintain the initial properties, nanoparticles must be dispersed in the polymer matrix uniformly. Various ways have been proposed to improve this dispersion by modification of the nanoparticles surface with organic compounds. These functionalities can even participate in polymerization reactions or help their compatibilization. Most organic polymers can protect these nanoparticles against environmental degradation due to their hydrophobic nature. Magnetic nanoparticles and nanocomposites have several applications in dye, ink, sensors and microprocessors, medicine, controlled drug delivery, catalysts, water treatment and waste separation. Magnetic polymers have become increasingly important because of their properties such as toughness, easy processability, flexibility, elasticity and biocompatibility, as well as reversible chemical and physical changes in response to an external magnetic field. The main feature of these polymers is their ability to respond to changes in external magnetic field, as they quickly undergo microscopic changes structurally by on/off switching of the magnetic field. Magnetic gels and elastomers are some examples of these materials that have attracted much attention recently.
Basparesh
Iran Polymer and Petrochemical Institute
2252-0449
8
v.
3
no.
2018
3
13
http://basparesh.ippi.ac.ir/article_1560_0ff06811fb492202b6ee47bd4199d92d.pdf
dx.doi.org/10.22063/basparesh.2018.2216.1431
Polymer Crystallization in the Presence of Carbon Nanofillers
farshad
cheram
Isfahan University of Technology
author
Mitra
Tavakoli
Academic member
author
text
article
2018
per
Carbonaceous nanofillers, i.e., fullerene, carbon nanofiber, carbon nanotube, and graphene have emerged as a new class of functional nanomaterials world-wide due to their exceptional electrical, thermal, optical, and mechanical properties. One of the most promising applications of LDCNs is in polymer nanocomposites; these materials endow the polymer matrix with significant physical reinforcement and/or multi-functional capabilities. The relations between properties, structure and morphology of polymers in the nanocomposites offer an effective pathway to obtain novel and desired properties through structural manipulation, wherein the interfacial crystallization and the crystalline structure with the matrix are critical factors. By now, extensive studies have reported that LDCNs are highly effective nucleating agents that can significantly accelerate their crystallization kinetics and/or induce unique crystalline morphologies in nanocomposites. In this paper, a general overview of current sources for polymer induced crystallization in the presence of two-dimensional LDCN in isotactic polypropylene (ipp) and polyethylene is provided by a detail account of the LDCN two-dimensional and derivative, the crystallization kinetics LDCNs with/without flow fields, crystalline modification and interpolar crystalline morphology, the origin of polymer crystal presence in LDCNs on the basis of molecular simulations and experimental practices.
Basparesh
Iran Polymer and Petrochemical Institute
2252-0449
8
v.
3
no.
2018
14
25
http://basparesh.ippi.ac.ir/article_1548_4b8bb472e50a9c6322f82ae9d3f3eb56.pdf
dx.doi.org/10.22063/basparesh.2018.2061.1389
Polycaprolactone-based Electrospun Composites in Bone Tissue Engineering
peyman
sheikholeslami kandelousi
Babol University of Technology, Babol, Iran
author
text
article
2018
per
Natural bone tissue defects are caused by fractures and aging. The subject of tissue engineering has been raised and developed due to long-term self-healing processes or the lack of regeneration in severe injuries. The most important factors in successful tissue engineering are the selection of suitable cells and scaffolds. Various cells such as osteoblast, embryonic and mesenchymal stem cells are used, but the unique properties of mesenchymal cells have led to extensive application in the tissue engineering. Electrospinning is the one among several techniques to obtain scaffolds. In electrospinning method, because of the similarity of nanofibers with the extracellular matrix of the native tissue, the choice of different materials, the high surface area/volume ratio and the reconstruction of the tissue more than other methods have been considered. Polycaprolactone is a synthetic biopolymer that is widely employed in medical applications. The most important advantages of this polymer are high mechanical strength, simple processability, low toxicity, low immunogenicity. Mainly, the polymers are combined with ceramics to achieve the desired mechanical properties. Bone tissue engineering scaffolds should be biocompatible, biodegradable, high strength, porous, micro-scale pore size, and have smooth, uniform and free-bead morphology. Surface roughness and hydrophilicity of a membrane facilitates cellular behavior. The purpose of this research was the characterization and evaluation of polyacroplactone-based electrospinning scaffolds for bone tissue repair.
Basparesh
Iran Polymer and Petrochemical Institute
2252-0449
8
v.
3
no.
2018
26
35
http://basparesh.ippi.ac.ir/article_1562_1d3ad572afc68a2d328df6be9940446c.pdf
dx.doi.org/10.22063/basparesh.2018.2120.1408
CO2-Responsive Polymers. Part I. Fundamental Concepts and Classification
Sajad
Avar
Department of Polymer & Materials Chemistry, Faculty of Chemistry & Petroleum Sciences, Shahid Beheshti University, Tehran, Iran
author
Abbas
Rezaee Shirin-Abadi
Department of Polymer & Materials Chemistry, Faculty of Chemistry & Petroleum Sciences, Shahid Beheshti University, Tehran, Iran
author
text
article
2018
per
Stimuli-responsive systems, which have the ability to respond to external or internal stimuli through transition behaviors, constitute the most exciting scientific areas of smart materials. In recent years, the use of carbon dioxide (CO2), as a trigger in smart systems, has received great attention because it is inexpensive, available and abundant in nature. Some of various CO2-responsive materials include polymers, latexes, solvents, solutes, gels, surfactants, and catalysts. CO2-responsive materials reveal a reversible transition state (from neutral to charge state and vice versa) in response to environmental changes. The most important feature of these systems is that, during these transitions CO2 does not accumulate in a system upon repeated cycles. To have CO2-responsiveness in systems, CO2-responsive moieties are required in the structure of materials; these moieties can be a surfactant, monomer, initiator or solvent. Therefore, in this review, we start from recalling the chemical concepts of the CO2-responsive functional groups as well as presenting the fundamental principles of CO2-responsivity. Since, among the CO2-responsive materials that have been developed, polymer-based materials are of particular interest, in continue, we have provided some examples of systems including CO2-responsive polymers.
Basparesh
Iran Polymer and Petrochemical Institute
2252-0449
8
v.
3
no.
2018
36
44
http://basparesh.ippi.ac.ir/article_1564_802a6e677f5c6a14130b7e631abb0138.pdf
dx.doi.org/10.22063/basparesh.2018.2065.1391
Application of 3D Printing Technology in Novel Drug Delivery Systems: A Review
Arezou
Mashak
Department of Novel Drug Delivery Systems, Iran Polymer and Petrochemical Institute,
P.O. Box: 14965/115, Tehran, Iran
author
Azadeh
Ghaee
2Department of life science engineering, Faculty of new sciences and technologies,
University of Tehran, Tehran, Iran
author
Hamid
Mobedi
Department of Novel Drug Delivery Systems, Iran Polymer and Petrochemical Institute,
P.O. Box: 14965/115, Tehran, Iran
author
text
article
2018
per
In 3D printing process, objects are made using a digital model data by adding a material, as layer by layer, to produce a desired geometry. In recent years, the application of 3D printing technology has been considered for the manufacture of pharmaceutical products with the ability of controlled drug delivery. The advantages of this approach include the ability to prepare personalized dosage forms for each patient with complex geometrical shapes along with simultaneous loading of several different drugs and excipients. Manufacturing of products containing low-solubility drugs, potent drugs and peptides as well as achieving the release of multi-drugs profiles are possible through 3D printing technique. The prepared dosage forms by 3D printing method based on patient's needs in considering his/her age, race, weight and gender could achieve more drug efficacy and less toxicity and side effects. 3D printers are of different types according to the working methods and initial materials. The most suitable techniques for 3D printing of medicines are nozzle-based deposition, printing-based inkjet systems and stereolithography. It is necessary to consider several parameters such as drug stability and drug loading capacity in a 3D printing technology to acquire an optimal drug release profile. This review introduces 3D printing technique and the related hardware commonly used. This article also summarizes the variety of dosage forms obtained using this technology.
Basparesh
Iran Polymer and Petrochemical Institute
2252-0449
8
v.
3
no.
2018
45
56
http://basparesh.ippi.ac.ir/article_1573_599dd3cd25270ed996eaa0b1ad8d63b2.pdf
dx.doi.org/10.22063/basparesh.2018.2163.1421
Effect of Material Parameters on Pot Life of Composite Solid Propellant Based on Hydroxyl-Terminated Polybutadiene: A Short Review
Abbas
Kebritchi
Assistant Professor/Imam Hussein Comprehensive University
author
Hadi
Mohamad Taghi Nejad
Imam Hossein Comprehensive University, Technical Department, Chemical Engineering Group
author
text
article
2018
per
Studying the material parameters in relation to the pot life of composite solid propellant (energetic composite) based on hydroxyl-terminated polybutadiene (HTPB) is important in production of large and medium scale grains. The present article is a review on extending the pot life of energetic composites based on HTPB using bicurative curing system of toluene diisocyanate (TDI) and isophorone diisocyanate (IPDI). Moreover, the effect of dibutyltin dilaurate (DBTDL) and ferric tris(acetyl acetonate) (FeAA), as curing catalysts, on curing reaction and pot life is studied. The studies showed that pot life extension of energetic composite is possible by tuning the material parameters such as type of curing agent, curing catalyst, plasticizer type and microstructure of HTPB. This can be obtained through primary and binary curatives, tuning the content of curing catalyst and plasticizer and by high cis- or high trans-HTPBs. Highest viscosity in energetic composite slurries has been obtained for TDI system and lowest one has been found for IPDI system. Bicurative curing system has shown a moderate viscosity range. Constant rates of k1 and k2 in both HTPB-IPDI and HTPB-TDI systems are increased by catalyst content. By increasing the vinyl content in HTPB, viscosity is increased. Also, the extension and pot life have been promoted by cis and trans contents or lowered vinyl content in HTPB microstructure.
Basparesh
Iran Polymer and Petrochemical Institute
2252-0449
8
v.
3
no.
2018
57
68
http://basparesh.ippi.ac.ir/article_1561_7dc48ceb0df663a1c7e91d08059e3c3f.pdf
dx.doi.org/10.22063/basparesh.2018.2152.1418
Reports
text
article
2018
per
Basparesh
Iran Polymer and Petrochemical Institute
2252-0449
8
v.
3
no.
2018
69
80
http://basparesh.ippi.ac.ir/article_1604_03a268cc5f473a1fb5978b9f7b192917.pdf