The purpose of characterisation may be stated as, in the most general terms, elucidation
of a structure-property relationship. The structural characteristics include MW, its
distribution, branch patterns and gel types. Microstructure is also included in this category.
In addition there are compositional differences among copolymers and blends. The term,
property, implies static characteristics such as density and specific heat, although
sometimes, dynamic characteristics such as viscoelastic behaviour, are called viscoelastic
properties. In order to be all-inclusive the structure-property relationship may be restated
as the relationship between the structure/composition and property/behaviour.
Why do we need to elucidate such a relationship? This question is seldom asked because
the answer may be presumed to be obvious. In the industrial context, the answer lies in
the relationship shown in the following sequence:
Manufacturing
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Characterisation
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Processability
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Product Properties
Specific gum rubber is manufactured to meet the requirements of a finished product
having certain properties. This also requires the gum rubber to be processable with the
available equipment. Therefore, the characterisation activity is a valuable and often
indispensable link in the above relationship. When a problem arises because of an
unsatisfactory property in the product or unsatisfactory processability, the final answer
must be sought on how to alter the manufacturing process to produce a gum rubber with
acceptable properties. In short, we need to establish the above relationship as the
background knowledge needed for a day-to-day operation of the manufacturing process
as well as for problem solving.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
الرجوع الى لوحة التحكم
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