نتایج جستجو برای: پلیمر pmma

تعداد نتایج: 9036  

Journal: :Journal of physics 2021

This work on a compound polymer PMMA doped with some semi-metal oxides nanoparticles (SiO2, TiO2) NPs, intended to be utilized in corrective Contact Lenses. For this purpose the optical properties of (PMMA+2%SiO2, PMMA+2%TiO2, and PMMA+1%SiO2+1%TiO2) NPs were measured calculated get proper refractive indices dispersion (Abbe number) for these compounds design optimization.

Journal: :European journal of ophthalmology 2007
M Taskapili G Gulkilik M S Kocabora M Ozsutcu C Yilmazli G Kaya H Kucuksahin

PURPOSE To compare the results of sulcus implantation of acrylic and poly(methylmethacrylate) (PMMA) intraocular lens (IOL) in eyes with posterior capsule tear during phacoemulsification surgery. METHODS In all eyes a posterior capsule tear developed during phacoemulsification surgery and an IOL to the ciliary sulcus was implanted primarily. A total of 89 eyes of 88 patients received hydrophi...

Journal: :international journal of nano dimension 0
a. kodge department of chemistry, singhania university, rajastan, india. s. kalyane department of physics, rural engineering college, bhalki, bidar, karnataka, india. a. lagashetty department of chemistry, appa institute of engineering & technology, gulbarga, karnataka, india.

nanosized metal oxides dispersed polymer composites constitute a fascinating class of polymer composite materials. synthesis of such composite materials through solvent casting enhances the polymer synthetic technology. solvent casting method was used to prepare cobalt oxide (co3o4) dispersed poly (methyl methacrylate) (pmma) nano composite. x-ray diffraction tool is used to know the structural...

Journal: :بینا 0
حسین محمدربیع h mohammad rabei تهران- خیابان شهید مدنی- بیمارستان امام حسین (ع) زهره بهروزی z behrouzi تهران- خیابان شهید مدنی- بیمارستان امام حسین (ع) ژاله رجوی z rajavi تهران- خیابان شهید مدنی- بیمارستان امام حسین (ع) نوشین صالحی n salehi تهران- خیابان شهید مدنی- بیمارستان امام حسین (ع)

purpose: to compare the effect of implantation of a single-piece hydrophilic foldable acrylic intraocular lens (iol) with rectangular optic edge and a single-piece polymethyl methacrylate (pmma) iol with rounded optic edges on posterior capsular opacification )pco(. methods: this randomized clinical trial study comprised 74 eyes with senile cataract in an otherwise normal eye in patients older ...

2009
Dong Ki Ahn Song Lee Dea Jung Choi Soon Yeol Park Dae Gon Woo Chi Hoon Kim Han Sung Kim

STUDY DESIGN Mechanical study of polymethylmetacrylate (PMMA) mixed with blood as a filler. PURPOSE An attempt was made to modify the properties of PMMA to make it more suitable for percutaneous vertebroplasty (PVP). OVERVIEW OF LITERATURE The expected mechanical changes by adding a filler into PMMA included decreasing the Young's modulus, polymerization temperature and setting time. These ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی شاهرود - دانشکده شیمی 1393

در این مطالعه،کامپوزیت pmma/nioدر سه مرحله تهیه شد. در مرحله اول نانوذرات اکسید نیکل به روش رسوب¬دهی شیمیایی از طریق واکنش 6h2o.nicl2با سود و کلسینه کردن رسوب در دمای 300 درجه سانتی¬گراد طی 2 ساعت تهیه شد. سطح نانوذرات سنتز شده به منظور پراکندگی بهتر و سازگاری مناسب در محیط آلی به وسیله اولئیک اسید در حلال اتانول اصلاح شد. نانوذرات اصلاح شده درمونومر متیل متاکریلات (mma)پراکنده و از طریق پلیمری...

2011
Periathamby Antony Raj Andrew R Dentino

PURPOSE Poly(methyl methacrylate) (PMMA) has been widely used as a denture-base acrylic resin due to its excellent physical and mechanical properties. However, the material is highly prone to microbial fouling that often leads to Candida-associated denture stomatitis. Incorporation of phosphate groups into PMMA could facilitate adsorption of salivary antimicrobials and inhibit microbial adheren...

2011
M. I. ISMAIL

Polymethyl methacrylate, PMMA, is one of the most important thermoplastic material which can be used as replacement of glass due to its unmatched properties. But PMMA is prone to UV and thermal degradation. So to overcome this drawback, along with PMMA, UV absorber is incorporated which not only acts as a stabiliser but also inhibits 60% of degradation. It also provides better thermal stability...

Journal: :The Journal of the American Academy of Orthopaedic Surgeons 2010
Todd Jaeblon

Polymethylmethacrylate (PMMA) has been used in orthopaedics since the 1940s. Despite the development and popularity of new biomaterials, PMMA remains popular. Although its basic components remain the same, small proprietary and environmental changes create variations in its properties. PMMA can serve as a spacer and as a delivery vehicle for antibiotics, and it can be placed to eliminate dead s...

2010
Al Saleh

As an alternative to PMMA, a newly developed calcium triglyceride bone cement (CTBC) (Kryptonite, Doctors Research Group, USA) has been reported to have osteoconductive properties [2]. In addition, CTBC is adhesive, non-toxic, and low exothermic, all of which would be advantageous in vivo. It has also been shown to have a modulus of elasticity very similar to bone, which is drastically differen...

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