Functional Synthetic Polymers

Johannes Karl Fink

• Publisher: Wiley-Scrivener
• Year: 2019
• Print ISBN: 9781119592020
• eBook ISBN: 9781119593133
• Edition: 1
• Topic: Physical Sciences
• Subtopic: Inorganic Chemistry

The text focuses on the basic issues and also the literature of the past decade. The book provides a broad overview of functional synthetic polymers.

Special issues in the text are: Surface functionalization supramolecular polymers, shape memory polymers, foldable polymers, functionalized biopolymers, supercapacitors, photovoltaic issues, lithography, cleaning methods, such as recovery of gold ions olefin/paraffin, separation by polymeric membranes, ultrafiltration membranes, and other related topics.

Chapter 1
Basic Issues of Functionalized Polymers

In organic chemistry, functionality is often used as a synonym for a functional group. Functionalization means the introduction of functional groups. According to IUPAC (1), the functionality of a monomer is defined as the number of bonds that a repeating unit of a monomer forms in a polymer with other monomers. Thus, in the case of a functionality of f = 2, a linear polymer is formed by polymerizing a thermoplastic material.

Monomers with a functionality of > 3 lead to a branching point, which can result in crosslinked polymers, i.e., a thermosetting polymer (2).

Functional polymers are also sometimes called smart polymers (3). Here, the basic issues of functionalized polymers are discussed.

Functional polymers are polymers with advanced optic and/or electronic properties. The advantages of functional polymers include their low cost, the ease in which they can be processed and a range of attractive mechanical characteristics for functional organic molecules.

These properties can be adjusted whilst material usage is kept low, consequently opening interesting environmental perspectives. Polymer-bound substances can spread their activity without endangering people or the environment. Examples of functional polymers are (4):

1. Semiconducting conjugated polymers.
2. Stimuli-responsive polymers,
3. Thermally responsive polymers,
4. pH-sensitive polymers,
5. Toner materials,
6. Supercapacitors,
7. Ion exchange resins,
8. Biomimetic materials, and
9. Supramolecular metallopolymers.

Functional polymers are macromolecules to which chemically bound functional groups are attached which can be utilized as reagents, catalysts, protecting groups, and others. Functional polymers are low cost, easy to process and have a range of attractive mechanical characteristics for functional organic molecules.

The polymer support can be either a linear species, which is soluble, or a crosslinked species which is insoluble. A polymer that can be used as support should have significant mechanical stability under the reaction conditions. Such properties of the support play an important role in the functionalization reactions of polymers. So, the polymer properties can be modified either by chemical reactions on pendant groups or by changing the physical nature of the polymers. Special uses of functional polymers are shown in Table 1.1.

Table 1.1 Uses of functional polymers (5).

Field of Application	Use
Analytical chemistry	Polymers as stationary-phase (chromatography/extraction)
Catalysis engineering	Polymers as a catalyst
Medicine, agriculture, washing agents	Controlled release from polymer matrices, design and synthesis of functional polymers, polymer-bound dyes, reactive and functional polymers
Polymer modification	Surface and functional coatings

There are monographs dealing with functional polymers (6–14).

A comprehensive and authoritative overview of functional polymers and polymeric materials has been presented (14). This ranges from their synthesis and characterization, to their properties, actual applications and future perspectives.

Functional polymers and smart polymeric materials play a decisive role in new innovations in all areas where new materials are needed. Optoelectronics, catalysis, biomaterials, medicine, building materials, water treatment, coatings, and many more applications rely on functional polymers.

Functional polymers are polymers that respond to different stimuli or changes in the environment. The types of polymers, including temperature-, pH-, photo-, and enzyme-responsive polymers, have been assessed (10). These issues include shape-memory polymers, smart polymer hydrogels, and self-healing polymer systems.

Applications of functional polymers include smart instructive polymer substrates for tissue engineering, smart polymer nanocarriers for drug delivery, the use of smart polymers in medical devices for minimally invasive surgery, diagnosis, and other applications, and smart polymers for bioseparation and other biotechnology applications. Functional polymers are also used for textile and packaging applications, and for optical data storage.

Adaptive polymers are those which are responsive to different stimuli, namely physical, mechanical, chemical and biological stimuli, with a controlled and/or predicable behavior. They can be used in textiles, skin care, medicine and other related areas. Some versatile functional polymers, such as chitosan, cylodextrin and dendrimer, and hyperbranched polymers have also been reviewed (8).

Functional polymers are also important materials for coatings (11). For example, superhydrophobic surfaces can be produced.

Also, functional biopolymers have been reviewed (15). A comprehensive overview of the synthesis, properties and biomedical applications of functional biopolymers has been presented. A lot of topics are covered, such as synthetic biopolymers, blood-compatible polymers, ophthalmic polymers and stimuli-responsive polymers. An up-to-date review of cell encapsulation strategies and cell surface and tissue engineering has also been included in this work.

1.0.1 Standards

Actually, standards specifically designed for functional polymers are rare. No standard with the term functional polymer in the title could be found. However, in the scientific literature, in the context of functional polymers, some standards for measuring the properties of these polymers have been mentioned. These standards are collected in Table 1.2.

Table 1.2 Standards in the context of functional polymers.

Number	Title	Reference
ASTM D3643-15	Standard Test Method for Acid Number of Certain Alkali-Soluble Resins	(16)
ASTM D790-17	Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials	(17)
ASTM D785-08	Standard Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials	(18)
ASTM D638-14	Standard Test Method for Tensile Properties of Plastics	(19)
ASTM D570-98	Standard Test Method for Water Absorption of Plastics	(20)
ASTM F813-07	Standard Practice for Direct Contact Cell Culture Evaluation of Materials for Medical Devices	(21)
ASTM F619-14	Standard Practice for Extraction of Medical Plastics	(22)
ASTM D5229	Standard Test Method for Moisture Absorption Properties and Equilibri...

Table of contents

• Cover
• Title Page
• Copyright
• Preface
• Acknowledgements
• Chapter 1: Basic Issues of Functionalized Polymers
• Chapter 2: Methods and Principles of Functionalization
• Chapter 3: Technical Applications
• Chapter 4: Medical Applications
• Chapter 5: Pharmaceutical Applications
• Index
• End User License Agreement