Menachem Lewin was a titan of polymer and fiber science whose career spanned seven decades and two continents. A pioneer in the chemistry of cellulose and the development of flame-retardant materials, Lewin’s work bridged the gap between fundamental molecular research and industrial application. His leadership transformed Israel into a global hub for textile research and later revitalized polymer science education in the United States.
1. Biography: From Lublin to Brooklyn
Menachem Lewin was born on March 26, 1918, in Lublin, Poland. Sensing the rising tides of antisemitism and political instability in Europe, he immigrated to Mandatory Palestine in 1937 to pursue higher education.
Education and Early Career:
Lewin enrolled at the Hebrew University of Jerusalem (HUJ), where he earned his M.Sc. in Chemistry in 1944 and his Ph.D. in 1947. His doctoral work focused on the physical chemistry of cellulose, a topic that would define his professional life. During the 1948 Arab-Israeli War, Lewin’s expertise was diverted to the war effort; he served as a senior researcher for the Scientific Corps of the Israel Defense Forces, focusing on the chemistry of explosives and materials science.
The Israel Fiber Institute:
In 1953, the Israeli government and the United Nations tasked Lewin with a monumental project: founding the Israel Fiber Institute in Jerusalem. As its Director for over 30 years (1953–1986), he turned the institute into a world-class facility that supported Israel’s nascent textile and paper industries while producing high-level academic research.
The American Chapter:
In the late 1980s, Lewin moved to the United States. He joined the Polytechnic Institute of Brooklyn (now the NYU Tandon School of Engineering) as a Research Professor in the Polymer Research Institute. Even as an octogenarian, he remained an active researcher, lecturer, and editor until his death in February 2011 at the age of 92.
2. Major Contributions: The Chemistry of Protection and Structure
Lewin’s scientific output was prolific, encompassing over 500 publications and 30 patents. His work focused on three primary pillars:
- Cellulose Oxidation: Lewin performed seminal research on how cellulose (the primary component of cotton and wood) reacts with oxidizing agents like bromine and chlorine. His work provided the theoretical framework for modern industrial bleaching processes, making them more efficient and less damaging to fiber strength.
- Flame Retardancy (FR): Perhaps his most significant contribution was his study of polymer combustion. He was a pioneer in "intumescence"—the process by which a material swells when exposed to heat, forming a char layer that protects the underlying structure. He developed synergistic chemical systems (notably involving bromine and antimony) that are still used to make clothing, upholstery, and building materials fire-resistant.
- Fiber Physics: Lewin developed new methodologies for measuring the crystallinity and orientation of polymers. He proved that the "fine structure" of a fiber—how the molecules are packed—directly dictated its mechanical properties and how it reacted to dyes and chemicals.
3. Notable Publications
Lewin was a master synthesizer of information, editing the definitive texts used by generations of textile chemists.
- Handbook of Fiber Science and Technology (1983–2004): This multi-volume series, which Lewin edited, remains the "bible" of the field. It covers everything from high-tenacity fibers to the chemical processing of fabrics.
- Chemical Processing of Fibers and Fabrics (1984): Co-authored with Stephen Sello, this work focused on the functional finishes of textiles, including water repellency and crease resistance.
- Biodegradable Polymers as Industrial Raw Materials (1990): Lewin was an early advocate for sustainability, exploring how natural polymers could replace synthetics.
- Editor-in-Chief: He was the founding editor of the Journal of Fiber Science and Technology (now Polymers for Advanced Technologies), which became a premier venue for polymer research.
4. Awards & Recognition
Lewin’s accolades reflected his status as a global authority in materials science:
- The Olney Medal (1993): Awarded by the American Association of Textile Chemists and Colorists (AATCC), this is the highest honor in textile chemistry.
- The Habif Prize (1959): Awarded by the University of Geneva for his contributions to industrial chemistry.
- Honorary Fellowship of the Textile Institute (UK): One of the highest international honors for fiber scientists.
- The Founders Award: From the Polymer Extension Center for his lifelong contributions to polymer science.
5. Impact & Legacy
Menachem Lewin’s legacy is found in the safety standards of the modern world. Every time a consumer buys "fire-rated" pajamas or flame-retardant carpeting, they are benefiting from the chemical principles Lewin helped establish.
Beyond the lab, his legacy is institutional. He mentored hundreds of scientists who went on to lead the Israeli chemical industry (such as Dead Sea Works and Makhteshim Agan). At NYU-Poly, he was instrumental in maintaining the relevance of the Polymer Research Institute, ensuring that "old-school" fiber science evolved to meet the needs of modern nanotechnology and biotechnology.
6. Collaborations
Lewin was a deeply collaborative figure, often working at the intersection of academia and industry.
- Eli M. Pearce: At NYU-Poly, Lewin and Pearce (a former President of the American Chemical Society) collaborated extensively on the flammability of polymers, co-authoring numerous papers on char formation.
- Jack Preston: He worked with Preston on high-temperature resistant fibers (aramids), which are crucial for aerospace and military applications.
- International Partnerships: Lewin maintained strong research ties with the North Carolina State University (NCSU) College of Textiles and the Textile Research Institute (TRI) in Princeton.
7. Lesser-Known Facts
- A "Scientific Soldier": During the Israeli War of Independence, Lewin’s research was literally a matter of national survival. He worked on developing indigenous sources for chemicals needed for defense when imports were blocked.
- Polyglot Scholar: Lewin was known for his incredible linguistic range, being fluent in Hebrew, English, Polish, German, and French, which allowed him to act as a bridge between the European chemical traditions and the burgeoning American and Israeli scientific communities.
- Active Until the End: Lewin never truly retired. He was known to commute into Brooklyn well into his 90s, continuing to edit journals and mentor young faculty. He famously remarked that:
"polymers don't get old, they just cross-link"
a chemist’s joke about the aging process. - The Bromine Pioneer: He was instrumental in finding industrial uses for the bromine extracted from the Dead Sea, helping to turn a raw natural resource into a high-value export for the State of Israel.