Mechanical Properties of Supramolecular Polymeric Materials Formed by Cyclodextrins as Host Molecules and Cationic Alkyl Guest Molecules on the Polymer Side Chain

2018 ◽  
Vol 51 (16) ◽  
pp. 6318-6326 ◽  
Author(s):  
Yoshinori Takashima ◽  
Kohei Otani ◽  
Yuichiro Kobayashi ◽  
Hikaru Aramoto ◽  
Masaki Nakahata ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymeric Materials ◽  
Side Chain ◽  
Guest Molecules ◽  
Host Molecules

Side Chain Polymers for Electro-Optic Applications

1991 ◽  
Vol 228 ◽  
Author(s):  
Ronald N. DeMartino ◽  
Diane E. Allen ◽  
Richard Keosian ◽  
Garo Khanarian ◽  
David R. Haas
Keyword(s):  
Mechanical Properties ◽  
Optical Activity ◽  
Molecular Basis ◽  
Molecular Design ◽  
Polymeric Materials ◽  
Side Chain ◽  
New Materials ◽  
Electro Optic ◽  
Recent Developments ◽  
Nlo Materials

ABSTRACTOrganic and polymeric materials have emerged in recent years as candidates for advanced device and systems applications. This interest has arisen from the promise of extraordinary optical, structural, and mechanical properties of certain organic materials, and from the fundamental success of molecular design performed to create new materials.Our approach to the problem is to develop an understanding of the molecular basis of non-linear optical activity, incorporate the most promising candidates into tractable polymers, and evaluate these materials in device format. This paper will review some of the recent developments in the NLO materials effort at Hoechst Celanese.

Mechanical properties of supramolecular polymeric materials cross-linked by donor–acceptor interactions

2019 ◽  
Vol 55 (26) ◽  
pp. 3809-3812 ◽  
Author(s):  
Misaki Itano ◽  
Yuichiro Kobayashi ◽  
Yoshinori Takashima ◽  
Akira Harada ◽  
Hiroyasu Yamaguchi
Keyword(s):  
Mechanical Properties ◽  
Polymeric Materials ◽  
Side Chain ◽  
Donor And Acceptor ◽  
Aromatic Donor ◽  
Donor Acceptor ◽  
Acceptor Molecules

We prepare a tough elastomer with aromatic donor and acceptor molecules introduced on the same polymer side chain.

Possibilities of using biodegradable polymeric materials in the agricultural sector

2020 ◽  
Vol 67 (2) ◽  
pp. 115-120
Author(s):  
Raisa A. Alekhina ◽  
Victoriya E. Slavkina ◽  
Yuliya A. Lopatina
Keyword(s):  
Mechanical Properties ◽  
Biodegradable Polymers ◽  
Biodegradable Polymer ◽  
Agricultural Sector ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
Limiting Factors ◽  
Research Purpose ◽  
Biodegradable Materials ◽  
Advantages And Disadvantages

The article presents options for recycling polymers. The use of biodegradable materials is promising. This is a special class of polymers that can decompose under aerobic or anaerobic conditions under the action of microorganisms or enzymes forming natural products such as carbon dioxide, nitrogen, water, biomass, and inorganic salts. (Research purpose) The research purpose is in reviewing biodegradable materials that can be used for the manufacture of products used in agriculture. (Materials and methods) The study are based on open information sources containing information about biodegradable materials. Research methods are collecting, studying and comparative analysis of information. (Results and discussion) The article presents the advantages and disadvantages of biodegradable materials, mechanical properties of the main groups of biodegradable polymers. The article provides a summary list of agricultural products that can be made from biodegradable polymer materials. It was found that products from the general group are widely used in agriculture. Authors have found that products from a special group can only be made from biodegradable polymers with a controlled decomposition period in the soil, their use contributes to increasing the productivity of crops. (Conclusions) It was found that biodegradable polymer materials, along with environmental safety, have mechanical properties that allow them producing products that do not carry significant loads during operation. We have shown that the creation of responsible products (machine parts) from biodegradable polymers requires an increase in their strength properties, which is achievable by creating composites based on them. It was found that the technological complexity of their manufacture and high cost are the limiting factors for the widespread use of biodegradable polymers at this stage.

scholarly journals Anti-Inflammatory Properties of Injectable Betamethasone-Loaded Tyramine-Modified Gellan Gum/Silk Fibroin Hydrogels

Biomolecules ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1456
Author(s):  
Isabel Matos Oliveira ◽  
Cristiana Gonçalves ◽  
Myeong Eun Shin ◽  
Sumi Lee ◽  
Rui Luis Reis ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Mechanical Properties ◽  
Silk Fibroin ◽  
Therapeutic Efficacy ◽  
Composite Structures ◽  
Gelation Time ◽  
Polymeric Materials ◽  
Gellan Gum ◽  
Traditional Use

Rheumatoid arthritis is a rheumatic disease for which a healing treatment does not presently exist. Silk fibroin has been extensively studied for use in drug delivery systems due to its uniqueness, versatility and strong clinical track record in medicine. However, in general, natural polymeric materials are not mechanically stable enough, and have high rates of biodegradation. Thus, synthetic materials such as gellan gum can be used to produce composite structures with biological signals to promote tissue-specific interactions while providing the desired mechanical properties. In this work, we aimed to produce hydrogels of tyramine-modified gellan gum with silk fibroin (Ty–GG/SF) via horseradish peroxidase (HRP), with encapsulated betamethasone, to improve the biocompatibility and mechanical properties, and further increase therapeutic efficacy to treat rheumatoid arthritis (RA). The Ty–GG/SF hydrogels presented a β-sheet secondary structure, with gelation time around 2–5 min, good resistance to enzymatic degradation, a suitable injectability profile, viscoelastic capacity with a significant solid component and a betamethasone-controlled release profile over time. In vitro studies showed that Ty–GG/SF hydrogels did not produce a deleterious effect on cellular metabolic activity, morphology or proliferation. Furthermore, Ty–GG/SF hydrogels with encapsulated betamethasone revealed greater therapeutic efficacy than the drug applied alone. Therefore, this strategy can provide an improvement in therapeutic efficacy when compared to the traditional use of drugs for the treatment of rheumatoid arthritis.

scholarly journals Mechanical and Morphological Properties of Bio-Phenolic/Epoxy Polymer Blends

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 773
Author(s):  
Ahmad Safwan Ismail ◽  
Mohammad Jawaid ◽  
Norul Hisham Hamid ◽  
Ridwan Yahaya ◽  
Azman Hassan
Keyword(s):  
Mechanical Properties ◽  
Phase Separation ◽  
Polymer Blends ◽  
Epoxy Polymer ◽  
Flexural Modulus ◽  
Polymeric Materials ◽  
Morphological Properties ◽  
Comparison Results ◽  
Unique Material ◽  
Different Types

Polymer blends is a well-established and suitable method to produced new polymeric materials as compared to synthesis of a new polymer. The combination of two different types of polymers will produce a new and unique material, which has the attribute of both polymers. The aim of this work is to analyze mechanical and morphological properties of bio-phenolic/epoxy polymer blends to find the best formulation for future study. Bio-phenolic/epoxy polymer blends were fabricated using the hand lay-up method at different loading of bio-phenolic (5 wt%, 10 wt%, 15 wt%, 20 wt%, and 25 wt%) in the epoxy matrix whereas neat bio-phenolic and epoxy samples were also fabricated for comparison. Results indicated that mechanical properties were improved for bio-phenolic/epoxy polymer blends compared to neat epoxy and phenolic. In addition, there is no sign of phase separation in polymer blends. The highest tensile, flexural, and impact strength was shown by P-20(biophenolic-20 wt% and Epoxy-80 wt%) whereas P-25 (biophenolic-25 wt% and Epoxy-75 wt%) has the highest tensile and flexural modulus. Based on the finding, it is concluded that P-20 shows better overall mechanical properties among the polymer blends. Based on this finding, the bio-phenolic/epoxy blend with 20 wt% will be used for further study on flax-reinforced bio-phenolic/epoxy polymer blends.

The Power of Spectroscopic Methods in the Determination of the Relative Orientation of Guest Molecules in a Stretched Polyethylene (PE) Matrix

1985 ◽  
Vol 39 (6) ◽  
pp. 976-979 ◽  
Author(s):  
Joanna Konwerska-Hrabowska
Keyword(s):  
Interaction Energy ◽  
Relative Orientation ◽  
Spectroscopic Methods ◽  
Guest Molecules ◽  
Spectroscopic Measurements ◽  
Host Molecules

Comparison of values for the relative orientation of pyrene guest molecules and PE host macromolecules obtained by spectroscopic measurements and by calculations of the minimum of the interaction energy between the guest and host molecules is presented. Accordance between both results as well as with the Groszek model is found.

Tribology study of hydroxyapatite (HAp) scaffold blended single based binder via rheology and mechanical properties

2017 ◽  
Vol 69 (3) ◽  
pp. 414-419
Author(s):  
Mimi Azlina Abu Bakar ◽  
Siti Norazlini Abd Aziz ◽  
Muhammad Hussain Ismail
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Palm Stearin ◽  
Polymeric Materials ◽  
High Energy ◽  
Single Step ◽  
Injection Molding Process ◽  
Plastic Behavior ◽  
Molding Process ◽  
Content Type

Purpose This paper aims to investigate the vital characteristic of an innovative ceramic injection molding (CIM) process for orthopedic application with controlled porosity and improved tribological and mechanical properties which were affected by complex tribological interactions, whether lubricated like hip implants and other artificial prostheses. The main objective is to maximize the usage of palm stearin as a single based binder as the function of flow properties during injection molding process. Design/methodology/approach The binder used in this present study consists of 100 per cent palm stearin manufactured by Kempas Oil Sdn Bhd and supplied by Vistec Technology Sdn Bhd. The feedstock was prepared by using a Z-blade mixer (Thermo Haake Rheomix OS) and Brabender mixer model R2400. The feedstock prepared was injection molded using a manually operated vertical benchtop machine with an average pressure of about 5-7 bars. The firing step included the temporary holds at intermediate temperatures to burn out organic binders. At this stage, the green molded specimen was de-bound using a single-step wick-debinding method. Findings The maximum content of ceramic material is applied to investigate the efficiencies of net formulation that can be achieved by ceramic materials. The longer the viscosity will change with shear rate, the higher the value of n obtained instead. From the slope of the curves obtained in Figure 3, the value of n for the feedstock was determined to be less than 1, which indicates a pseudoplastic behavior and suitability for the molding process. Moreover, high shear sensitivity is important in producing complex and intrinsic specimens which are leading products in the CIM industry. Originality/value The feedstock containing HAp powder and palm stearin binder was successfully prepared at very low temperature of 70°C, which promoting a required pseudo-plastic behavior during rheological test. The single binder palm stearin should be optimized in other research works carried out, as palm stearin is most preferred compared to other polymeric materials that provided high energy consumption when subjected to the sintering process. Besides the binder is widely available in Malaysia, low cost and harmless effect during debinding process.

Polymer Crystallization History and Resultant Properties

1969 ◽  
Vol 42 (3) ◽  
pp. 769-779 ◽  
Author(s):  
John R. Collier
Keyword(s):  
Mechanical Properties ◽  
Glassy State ◽  
Polymeric Materials ◽  
Neck Formation ◽  
Rapid Crystallization ◽  
Platelet Morphology ◽  
Treatment Conditions ◽  
Crystallizing Polymers ◽  
Small Platelet ◽  
Crystallization From The Melt

Abstract Mechanical properties of semicrystalline polymeric materials are strongly influenced by the morphology into which these materials crystallize. In addition the morphology can be altered by changes in crystallization temperature and regime, crystallization pressure, melt treatment conditions, shear history, and probably other processing conditions. The mechanical properties reflect the changes in morphology not only in the initial moduli values but also the overall stress-strain relationships, including the fracture mechanism. A strong influence is noted, at least in the polymers cited, even when slight changes occur in average spherulite size, spherulitic fine structure, and in the nature of interlamellar ties. Smaller, finer textured spherulites with higher interconnections arc apparently more susceptible to yielding by neck formation and elongation to high values than are the larger, coarser textured spherulites than tend to fail by random brittle failure mechanisms at low elongations. In addition, if the chlorinated polyether (Penton) is typical of slowly crystallizing polymers, the change from spherulitic morphology obtained during crystallization from the melt to the small platelet morphology obtained during slow crystallization from quenched glassy state has a complex effect on mechanical properties. The specimens slowly crystallized from the glass exhibit initial shear and tensile moduli values higher than those exhibited for rapid crystallization from the melt and rapid crystallization from the glass, but lower than the corresponding values for slow crystallization from the melt. In addition, the only specimens of this chlorinated polyether that exhibited the ability to draw to high degrees of elongation (as a result of yielding by a necking phenomenon) were those crystallized slowly from the quenched glassy state.

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