Morphology of Polymer Blends
Introduction
Polymer morphology deals with structure of polymer systems,
mostly in solid state.
Polymer morphology is studied because of the strong relationship [morphology-properties], for example:
By blending dissimilar polymers one can design a variety of morphologies. Morphology control is of prime importance for polymer blends.
Morphology
Shape, optical appearance, or form of phase domains in substances, such as high polymers, polymer blends, composites, and crystals.
Note: For a polymer blend or composite, the morphology describes the structures and shapes observed, often by microscopy or scattering techniques, of the different phase domains present within the mixture.
Phase Domain
Region of a material that is uniform in chemical composition and physical state
Hard-Segment Phase Domain
Phase domain of microscopic or smaller size, usually in a block, graft, or segmented copolymer , comprising essentially those segments of the polymer that are rigid and capable of forming strong intermolecular interactions.
Note: Hard-segment phase domains are typically of 2–15 nm linear size.
Soft-Segment Phase Domain
Phase domain of microscopic or smaller size, usually in a block, graft, or segmented copolymer , comprising essentially those segments of the polymer that have glass transition temperatures lower than the temperature of use.
Note: Soft-segment phase domains are often larger than hard-segment phase domains and are often continuous.
Segmented Copolymer
Copolymer containing phase domains of microscopic or smaller size, with the domains constituted principally of single types of structural unit.
Note: The types of domain in a segmented copolymer usually comprise hard- and soft-segment phase domains.
Continuous Phase Domain (Matrix phase domain)
Phase domain consisting of a single phase in a heterogeneous mixture through which a continuous path to all phase domain boundaries may be drawn without crossing a phase domain boundary.
Note: In a polymer blend, the continuous phase domain is sometimes referred to as the host polymer, bulk substance, or matrix.
Discontinuous Phase Domain (discrete phase domain,
dispersed phase domain)
Phase domain in a phase-separated mixture that is surrounded by a continuous phase but isolated from all other similar phase domains within the mixture.
Note: The discontinuous phase domain is sometimes referred to as the guest polymer.
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 .
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