بنية المادة

ما هي البوليمرات ( المتماثرات) ؟

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ما هي البوليمرات ( المتماثرات) ؟

الوليمر هو جزئ عملاق ذو سلاسل كربونية يتكون من عدد كبير من الجزيئات الفردية المتصلة من نهاياتها . ويمكن التحكم في خواص البوليمرات طبقا لطول السلسلة ونوع الجزيئات المتصلة . والتيفلون مثلا هو بوليمر مفيد لأنه زلق ، أما النيوبرين فقيمته في مرونته .

ويوجد كثير من البوليمرات في الطبيعة . فالمطاط بوليمر طبيعي ، وكذلك الحرير والصوف . ويمتلئ جسم الإنسان بالبوليمرات ن من البروتينات التي تكون أنسجة الجسم إلى جديلات (DNA) التي تكون أساس الوراثة . ولكن كثيرا من البوليمرات اصطناعية فالبلاستيك يتكون من بوليمرات اصطناعية صيغت بأشكال مختلفة .

وعملية صناعة البوليمر بسيطة جدا . فيعرض الجزئ المفرد ( المونومر) في غرفة تفاعل مع عامل حفاز ينشط تكوين السلاسل ( والجزئ المفرد هو الجزئ المطلوب بلمرته أي تعدده وهو هنا الإثيلين ) وتحت الضغط ودرجة الحرارة العاليين ، تشكل الجزيئات المفردة نفسها في سلسلة منتظمة طويلة ، يتوقف طولها على زمن التفاعل . فيزداد طولها بازدياد مدة بقاء الجزيئات المفردة في غرفة التفاعل .

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