Development and characterization of ternary thermosetting polymer blends

مقدم أطروحة جامعية

Yusuf, Ban Ayyub

مشرف أطروحة جامعية

Dhyaa, Balkees M.

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم العلوم التطبيقية

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2010

الملخص الإنجليزي

Polyurethane (PUR) or polysulphide (PSR) rubbers to compose ternary polymer blends.

These polymeric blends are the matrix, which is reinforced with (TiO2) powder type with volume fraction of (10 %).

Ten polymeric blends were prepared from (Epoxy + Novolak) resins and either polyurethane or polysulphide with ratios : 90 %EP / 5 % Novolac / 5 % (PUR or PSR)).)1.

80 % EP / 10 % Novolac / 10 % (PUR or PSR)).)2.

3.

(70 % EP / 15 % Novolac / 15 % (PUR or PSR)).

4.

(60 % EP / 20 % Novolac / 20 % (PUR or PSR)).

5.

(50 % EP / 25 % Novolac / 25 % (PUR or PSR)).

The optimum mixing ratios (OMR) of those blends have been selected depending on achieving acceptable macro miscibility, best adhesion between three phases, and highest impact (I.S) of the best resulting blends.

Four blends with (OMR) were prepared : (70 % EP / 15 % Novolac / 15 % PUR)1.

(60 % EP / 20 % Novolac / 20 % PUR) .2 (60 % EP / 20 % Novolac / 20 % PSR) .3 (50 % EP / 25 % Novolac / 25 % PSR).4 These blends were tested by wear instrument, then the blends that gave the lowest wear rate were chosen [(70 % EP / 15 % Novolac / 15 % PUR) and (60 % EP / 20 % Novolac / 20 % PSR).

Several mechanical and physical tests are carried out on these samples, and these are : impact, compression, tensile, hardness, wear and diffusion.

We are focus in this study on wear test.

These tests are carried out on samples under the influence of normal conditions (room temperature) and after immersion of blends samples in the chemical solutions (H2O, H2SO4 and KOH) for 15, 30 and 45 days.

The normality for these chemical solutions is (0.2).

Results show that samples of blends reinforced with (TiO2) powder possess better mechanical properties of impact strength, tensile strength, compression strength, hardness and wear resistance.

After immersion, the blend samples in chemical solution, the compression strength, hardness and wear resistance decrease.

The properties of blend that contain polyurethane rubber were affected more.

The tests results are affected by all the chemical solutions, but the alkaline solution KOH is the most effective solution.

For wear test, results show that wear rate increases with increasing applied load, and increases or decreases with sliding velocity (depending on if it is high or low respectively).

The wear rate also increases with increasing the time of immersion in chemical solutions, especially in acidic solution H2SO4.

The results of diffusion coefficient show that blend (60 % EP / 20 % Novolac/ 20 % PSR) has upper value than blend [(70 % EP/15 % Novolac / 15 % PUR), in all chemical solutions.

التخصصات الرئيسية

الكيمياء

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305135