research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
Mathematical Model of Autoclave Curing of Epoxy Resin Based Composite Materials
الموديل الرياضي لعملية إنضاج متراكبات الأيبوكسي في جهاز الاوتوكليف

Authors: Adnan A. Abdul Razak --- Najat J. Salah --- Hassen Sh. Majdi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2007 Volume: 25 Issue: 7 Pages: 828-835
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

Polymer matrix composites using thermosetting resins as the matrix areincreasingly finding use in several applications. Process modelingdescribing the governing curing has played an important role, inimproving the fundamental understanding and development ofcomposite fabrication techniques. In present work, the thermokineticinvolved in the autoclave curing of fiber-reinforced epoxy has beenstudied by means of a computer program, using the transient heatconduction equation coupled with kinetic equation, and the initial andboundary conditions. In the analysis the cure assembly is assumed toconsist of a tool plate, composite laminate. The temperature distributionand the degree of reaction are obtained as a function of position andtime.

يشهد استخدام المواد المتراكبة الايبوكسية تطورا كبير ا. ويلعب الموديل الرياضي لعمليةالإنضاج دورا كبيرا في فهم هذه العملية وتحسينها وتطويرها .تم أيجاد مود يل رياضي يقوم بحساب درج ات الحرارة و درجة الإنضاج كدالة من الزمن( un steady state energy و الموضع ويشمل هذا الموديل على حل معادلة الطاقةنتيجة ( generated heat ) مع إضافة حدود تمثل الحرارة المتولدة equation )تصلب الايبوكسي . ويعتمد الموديل الرئيسي على موديل ديناميكية التفاعل الأيبوكسيوالذي تم دراسته باستخدام جهاز المسح التفاضلي


Article
Evaluation of some physical properties of the copolymerized temporary crown and bridge auto–cured acrylic resin (Reinforcement)

Authors: Akram A Mohammad --- Nadiaa H Hasan --- Lamia T Rejab
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2007 Volume: 7 Issue: 14 Pages: 160-165
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: To evaluate some of the physical properties which are transverse strength, tensile strength,surface hardness, water sorption and solubility of the auto–cured acrylic resin when copolymerizedwith epoxy resin at two different ratios 10% and 20% of its weight and then compared with that ofauto–cured alone and heat–cured acrylic resin alone. materials and methods: The tested samples weredivided into four groups according to the materials to be used and the samples of each group weresubdivided according to the test to be done. The samples were prepared according to ADASpecification No. 12. Statistically analysis of the physical properties was with (ANOVA) and Duncan'smultiple range test to determine significant different at (p ≤ 0.05 ) level of significance, and the meanvalue of the water sorption and solubility ratios compared with accepted limit of ADA SpecificationNo. 12. Results: The transverse strength, tensile strength and surface hardness in this study showed thatthere was a highly significant difference between the four tested groups. The result appeared improvingof the mechanical properties and decreasing the ratio of water sorption and solubility of the auto–curedacrylic resin and the resin was reinforced when copolymerized at 10%, but the values still not reachedthat of the heat–cured acrylic resin and they became worse when copolymerized at 20%.

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2007 (2)