تأثير حجم وكمية جسيمات الحجر الجيري الليبي على الخواص الميكانيكية للبولي إيثيلين عالي الكثافة
الشريط الجانبي للمقالة
محتوى المقالة الرئيسي
الملخص
هدفت هذه الدراسة إلى دراسة تأثير حجم وكمية جسيمات الحجر الجيري الليبي (كربونات الكالسيوم (CaCO3)) على الخواص الميكانيكية للبولي إيثيلين عالي الكثافة (HDPE). تم سحق صخور CaCO3 وطحنها إلى أحجام نانوية وخشنة باستخدام مطحنة مطرقة ومطحنة كرات الطرد المركزي. تم تحضير مركبات HDPE/CaCO3 بنسب 10 و20 و30 % من CaCO3 بنوعيه الناعم والخشن باستخدام بولي إيثيلين جلايكول (PEG) كمادة رابطة. بعد ذلك تم تقييم الخواص الميكانيكية مثل مقاومة الصدمة، قوة الشد، ومعامل يونغ وصلادة شور. كما تم التحقيق من علاقة الارتباط بين الخصائص الميكانيكية وكمية وحجم CaCO3. أظهرت نتائج حيود الأشعة السينية (XRD) أن متوسط أحجام جسيمات CaCO3 الخشنة والناعمة كانت 74 نانومتر و1 نانومتر على التوالي. اظهرت النتائج حدوث انخفاض ملحوظ في خاصية مقاومة الصدم بعد إضافة CaCO3 وزيادة محتواها. وبالعكس تماماً، أشارت النتائج إلى أن قوة الشد ازدادت بزيادة محتوى CaCO3 حتى نسبة 20%، كما ازداد معامل يونغ وصلادة شور بزيادة محتوى CaCO3. كما هو متوقع، أظهرت مركبات CaCO3 الناعمة (النانوية) خصائص ميكانيكية أفضل من المركبات المصنوعة من CaCO3 الخشنة. كما أظهرت النتائج وجود علاقة إيجابية قوية بين الحجم ومحتوى CaCO3 ومعظم الخصائص الميكانيكية. وبهذا أثبت الحجر الجيري الليبي أنه مادة تقوية ممتازة للبولي إيثيلين، من خلال تحسينه لخواصه الميكانيكية، وقدرته على خفض تكلفة الانتاج لهذه المواد.
CaCO3 was crushed and ground into various sizes nano and coarse using a hammer mill and a centrifugation ball mill. The mechanical properties including; tensile strength, young’s modulus and impact strength was evaluated. The results indicated that tensile strength increased with increasing loading level of CaCO3 up to 20%, and then decreased. on the other hand, the impact strength decreased significantly with the addition and increasing of the loading level of CaCO3.Most importantly, the better mechanical properties were observed with nano CaCO3 rather the Coarse CaCO3.
تفاصيل المقالة
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