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ABSTRACT
Chemical precipitation route has been demonstrated for in-situ chlorination of polypropylene and structural modification to integrate flame retardancy along with facile processing parameters, i.e. optimum melt flow index and mechanical properties. Thus, obtained chlorinated polypropylene (Cl-PP) was characterized for optimized composition and degree of chlorination, chemical structure, morphology, physical properties with the help of infra-red spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM), melt flow index and other standard methods. The analytical results revealed the 74% chlorination of polypropylene chain increased with the molecular weight, comparable melt flow index and improved flame retardancy from V2 to V0 grade on UL-94 scale due to reduced heat release rate and improved limiting oxygen index from 17.5 to 27.1 due to structural changes and induced polycrystallinity. The evolved features of PP were explained on the basis of synergistic interaction, evolved crystallinity, size reduction and functionality during chemical treatments and reprecipitations. Further, the obtained Cl-PP was explored as the coating material for insulation of cables with electric insulation and durable properties.
Graphical abstract
Acknowledgments
Authors are thankful to Principal, Bhaskaracharya College of Applied Sciences (University of Delhi) New-Delhi-75 for maintaining research culture in the college. One of us (Sandeep Kumar) also thankful to MoTA (Government of India) for providing SRF with award number 202122-NFST-BIH-00019.
Author contributions
Sandeep Kumar was involved in designing, performing experimental work, analytical characterization of samples and write paper. Bimal Chopra was involved in the synthesis of composite after chlorination and doing experiment; Ankush Koundal was involved in performing burning experiment and collecting experimental observation; Nand Gopal Giri was responsible for analytical characterization of samples and their interpretation; and Saroj Kr Shukla conceptualizes the problem, designs the experimental procedure and writes paper after explanation of results.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Ethical approval
The experiment study was not performed on humans.
Declarations
Authors have no conflicts to declare.
Data and code availability
No data are available in this category and all data are included in manuscript and supporting information.
Supplementary material
Supplemental data for this article can be accessed online at https://doi.org/10.1080/25740881.2024.2363256.
Additional information
Funding
Notes on contributors
Sandeep Kumar
Sandeep Kumar has completed B. Tech (Polymer Science) from University of Delhi and M. Tech (Polymer science and technology) from IIT Delhi, New-Delhi, India. He is presently pursuing his doctorate from University of Delhi. He has published three research papers and presented her work in different conferences and seminars. His research interest in development of conducting polymer for chemical sensors and flame retardant for polymeric materials.
Bimal Chopra
Bimal Chopra has completed B.Sc (Hons) in Polymer Science from University of Delhi and is currently pursuing aircraft maintenance engineering from SAA. He has published two research papers and presented his work in several conferences.
Ankush Koundal
Ankush Koundal has completed a B.Sc. (Hons.) in Polymer Science from the University of Delhi, and he is currently pursuing a M.Sc. in Polymer Science from CIPET-IPT Ahmedabad (Gujarat University). He has published three research papers and two review papers and presented his work at different international conferences. His research interests lie in the synthesis and characterization of bio-based materials and smart materials for functionalization and reinforcement of polymeric materials for commodity and specialty applications.
Nand Gopal Giri
Dr. Nand Gopal Giri is presently working as Associate Professor in Chemistry Department of Shivaji College, University of Delhi. He received Ph.D. on the topic “Chemical Studies of Functional Porphyrins and Related Compounds” in 2008 from University of Delhi. He has published 15 research papers of National and International repute, 2 book chapters of international repute and co-authored a book. He is life member of different academic and scientific bodies. He has over 15 years of teaching experience and 8 years of industrial experience in different fields. He is recipient of CSIR-JRF and presented his work in National and International conferences.
Saroj Kr Shukla
Saroj Kr. Shukla is currently working as faculty in Polymer Science Department, Bhaskaracharya College of Applied is Sciences, University of Delhi, India. He has earned M.Sc. and Ph.D. degree from the D. D. U. Gorakhpur University, India. Published more than 100 papers and abstracts in different international, national journal and conference proceeding along with Twenty contributory chapters in books of international repute. Edited a book entitled” Advanced Carbon Materials and Technology, for John Wiley, Scrivener Publishing LLC, 2013, ISBN: 978-1-118-68623-2” and a special issue for Materials Today Proceeding. Dr. Shukla is also member of editorial boards of International Journal of Nanotechnology in Diagnosis and Treatment, Austine Journal of Biosensors & Bioelectronics, Chemistry Africa and members of different scientific societies. Dr. Shukla has also awarded some of national and international awards for his scientific contributions like, Advance Materials Letter Award-2012, International Association Advance material Scientists Awards- 2011, Indian Association Solid State and Allied Chemists (Bronze Medal-2011), Best Paper awards during International conference on Advance Polymeric materials- 2013 at Central Institute of Plastics Engineering and Technology, Lucknow, Dr. N.G. Patel Award in NPTS-16 Lucknow University Lucknow and Advance material World Congress-2013, Izmir Turkey. His major research interests are advanced materials, agro wastes, micro-analytical techniques, nano composite, bio conducting polymers and opto-chemical devices.