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​This book provides an introduction of how radiation is processed in polymeric materials, how materials properties are affected and how the resulting materials are analyzed. It covers synthesis, characterization, or modification of important materials, e.g. polycarbonates, polyamides and polysaccharides, using radiation. For example, a complete chapter is dedicated to the characterization of biodegradable polymers irradiated with low and heavy ions. This book will be beneficial to all polymer scientists in the development of new macromolecules and to all engineers using these materials in applications. It summarizes the fundamental knowledge and latest innovations in research fields from medicine to space.

### Effects of Radiation on the Environment

The origin and existence of life on Earth owe to the presence of radiations that triggered photochemical transformations for sustainable life forms. The classification of radiations into ionizing and non-ionizing radiations, on the basis of interaction with matter, distinguishes their role in the evolution of the environment and its components. With advancement in scientific knowledge, there has been vast development in technological processes that utilize radiations for human benefits. But sometimes radiations pose to be potential risk for environment especially when used as weapon for mass destruction and during human negligence leading to catastrophic disasters.
Gurpreet Kaur, Jandeep Singh

### Radiation Physics and Chemistry of Polymeric Materials

The material properties can be modified/tailored by either of the techniques available such as top-down method, bottom-up method, composite ratio variation, doping of a suitable dopant, ion beam-related methods and many others. The modifications by ion beam and radiation treatment are quite effective techniques to calibrate the physical, chemical, surface and structural properties of the materials. Polymeric materials are highly radiation sensitive and their properties can be modified by exposing the material to different ions and radiation such as gamma rays, electron and proton beams as well as swift heavy ions. The focus of the present discussion is pointed towards the radiation (mainly swift heavy ions and gamma rays) induced modification of polymeric materials and their physical and chemical aspects. The fundamental concepts of energy transfer of swift heavy ions and the post-irradiation effects such as cross-linking and chain scissoring of polymeric materials have been discussed in this chapter. The polymeric chain scissoring and cross-linking are related to the structural, chemical, surface, electrical and free volume properties of the polymers. The concept of free volume is further related to gas diffusion and separation properties of some of the polymers. The discussion is limited up to the radiation-sensitive polymers such as polymethyl methacrylate, polyethylene terephthalate and polyallyl diglycol carbonate polymers in the present chapter. The applications related to ion beam technology have been discussed in the last section of this chapter.
Paramjit Singh, Rajesh Kumar

### High-Fluence Ion Implantation of Polymers: Evolution of Structure and Composition

The chapter presents an overview of the effects and phenomena leading to structural and compositional evolution of polymer materials under high-fluence ion implantation. Ion stopping mechanisms and degradation of polymer structure due to radiation damage are discussed, giving examples for different ion species and polymer types mostly focusing on the low- to medium-energy regimes. Typical depth profiles and tendencies in depth distribution of impurities as well as the related changes in composition of the implanted layers are analysed. The emphasis is put on the high-fluence implantation of metal ions leading to the nucleation of nanoparticles and formation of composite materials. A special case of cluster ion implantation is also discussed. Change in mechanical, electronic, optical and magnetic properties of the ion-implanted polymers is under the consideration in the final part of the chapter also including a brief overview on applications of these materials.

### Ion Beam Modification of Poly(methyl methacrylate) (PMMA)

In this chapter, we review fundamental issues related to the damaging processes of PMMA films induced by high-energy ions with kinetic energies from a few keV to a few GeV, covering the regimes of energy deposition dominated by nuclear collisions and by electronic excitation. Emphasis is given to present an overview of the bond-breaking processes, the changes in the polymer chemical structure, and the corresponding modifications in selected macroscopic physical properties (optical, mechanical, and electrical).
Raquel Silva Thomaz, Ricardo Meurer Papaléo

### Radiation-Induced Effects on the Properties of Polymer-Metal Nanocomposites

This chapter primarily includes the fundamental concepts related to metal nanoparticles with their unique features followed by importance of incorporating them in polymer matrix and finally considering irradiation as a novel tool to tailor the properties of metal–polymer nanocomposites. These nanocomposites are one of the promising materials which have been used in a wide variety of applications ranging from biomedical to optical and electrical devices to aerospace applications. Ionizing irradiation technique is among the most promising strategies for synthesis as well as to amend the changes in composite material because of the advantage of irradiation process compared to conventional synthesis like chemical, vapour deposition, etc., the process is simple, clean and controlled, carried out without producing undesired oxidants products of reducing agents, avoids the addition of undesirable impurities and produces composites which are highly stable. Irradiation-induced effects on polymer-metal nanocomposites provide unique pathway to control and modify the structural, optical and electrical properties of composites basically required for various applications as per desire. Thus, utilizing irradiations as a novel tool, a systematic study has been done to tune the properties of polymer-metal nanocomposites. Induced changes on structural, optical, and electrical properties have been conferred in this chapter.
Suman Mahendia, Rishi Pal Chahal, Anil Kumar Tomar, Heena Wadhwa, Shyam Kumar

### Swift Heavy Ion Irradiation Effects on the Properties of Conducting Polymer Nanostructures

J. Hazarika, A. Kumar

### Impact of Etchant Variables on the Track Parameters in CR-39 Polymer Nuclear Track Detector: A Review

Nuclear track detector has numerous applications in various fields. The effective use of this detector depends upon the thorough understanding of track parameters of energetic ions. The present study attempts to develop and strengthen this understanding. It describes the various methods to measure bulk etch rate $$\left( {V_{\text{B}} } \right)$$ of the detector and track etch rate $$\left( {V_{\text{T}} } \right)$$ of the incident ions. Further, it throws light on the other parameters such as bulk activation energy $$\left( {E_{\text{B}} } \right)$$, track activation energy $$\left( {E_{\text{T}} } \right)$$, sensitivity $$\left( S \right)$$, critical angle $$\left( {\theta_{\text{C}} } \right)$$ and etching efficiency $$\left( \eta \right)$$. Finally, an attempt is made to review the studies related to the impact of different etchants and etchant variables on the different types of CR-39. Based on the observations available in the literature, the comparisons are made among impacts of different etchants on CR-39 and results are compiled. The present review concludes the observations and their relevant impacts.
Pawan K. Diwan

### Synthesis of Hydrogels by Modification of Natural Polysaccharides Through Radiation Cross-Linking Polymerization for Use in Drug Delivery

Hydrogels are three-dimensional polymer structures that can captivate and hold a vast quantity of water. They have superior’s properties such as hydrophilicity, high swelling ability, non-toxic in nature, and biocompatibility which makes them prospective materials for various applications. The concept of graft copolymers in biomedical field developed in the past few ten years and lasts to fascinate researchers working in this sector. Research in this sector is ongoing with the aim of alteration of the inherent properties of polysaccharides after grafting, which offers premises to be pervasive in integrated systems with multiple functionalities or the enhanced properties of one domain. This chapter aims to give comprehensive details about research that have been made on radiation-induced synthesis of polysaccharide-based hydrogels in context to biomedical application. This review also intends to explain the mechanism of radiation-induced synthesis of hydrogels. The effect of various radiation sources such as gamma, microwave, electron, and heavy ions is also discussed. Also, current status and plans of hydrogels are presented along with proper citations extracted from the scientific literature. Moreover, this article provides you with essential information that one’s need to start work in this area.
Kashma Sharma, Vishal Sharma, Vijay Kumar

### Effects of Radiations on the Properties of Polycarbonate

The exposure of the polymer to radiation results in modification on chemical and physical properties of the polymer. Whenever radiation passes through polymer, the drastic changes in the optical, electrical, thermal, chemical, structural, surface morphological, mechanical and rheological properties due to chain scission, chain aggregation, cross-linking, gas evolution etc. The chain scission process results in the decreases of molecular weight, whereas cross-linking process increases the molecular weight. This chapter deals with the changes in the properties of PC due to the effect of the radiation along with the detailed schematic mechanism.
K. Hareesh, Ganesh Sanjeev

### Plasma Irradiation of Polymers: Surface to Biological Mitigation

Development in science and technology has made human life much simpler, but evolution and progress of time as well as increasing human demand have generated problems related to energy, health [1], etc. Progress in science and technology is trying to solve these issues to make the human life more comfortable. Growing requirement of biomedical devices, replacement of body parts after their failure, body implants [2, 3], bio-separation, sterilizations [4, 5], biosensors, etc. [6, 7], have shown need of development of advance smart materials (biomaterials). The choice of any material to be used as biomaterial/biomedical applications [8] depends on physical, chemical, surface, and biological properties, i.e., the presence of functional groups, surface free energy, hydrophilicity, surface morphology affects use of any material as biomaterial [9]. In other words, materials having high bio-adoptability and biocompatibility can only be used as biomaterials [10, 11]. Polymers arise as a suitable alternative of conventional biomaterial from last few decades, for synthesis of important biomaterials in modern manufacturing processes as they offer wide varieties of physical, chemical, biological, mechanical, and elastic properties with good processability. None of the normally available polymers possess surface and chemical properties required for many of biomedical applications. Nanomaterials and low-temperature plasma processing offer a novel route for surface and chemical modification in controlled manner without affecting their bulk properties [12]. Plasama processing can be utilized in various pathways to control the desired properties of modified materials, makes plasma so important that we can say “Plasma will future: Plasma for mankind.” Present work shows efficient and relevant route for synthesis of nanobiomaterials using nanotechnology and plasma processing to fabricate biomedical devices for biomedical applications [13].
Narendra Kumar Agrawal, Neha Sharma, Tamanna Kumari Sharma, Priti Agarwal, Ravi Agarwal

### Effects of Neutron Irradiation on Polymer

Polymers have been widely utilized in various applications due to their low cost and easy processability and thus could be utilized in radiation-prone areas for their radiation-resistant behaviour. Ionizing radiations induce chemical kinetics in the polymers leading to the exchange reactions causing the variations in structural conformations. Neutrons since the discovery in 1932 have been posed as a special particle due to its neutral behaviour and hence been utilized in many medical and industrial applications. The neutral behaviour provides it a greater penetration depth and therefore more quantitative measurements to greater accuracy. This chapter has been devoted to review the influence of neutrons in various polymers for their utilization in apron making for radiation workers and neutron dosimetry. Special attention has been paid to the structural elucidation and reactivity of ionized molecules upon exposure of the polymers to the neutron beam. Recent developments in utilizing the neutron irradiation for modifications and upgrading the properties of polymers have also been discussed.
Sangeeta Prasher, Mukesh Kumar