POLYMERS　Vol.70　No.12

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COVER STORY The Ring

Cyclic polymers do not possess a beginning or end, which can provide properties, such as differences in melting points and hydrodynamic volumes, compared to linear polymers. Research on cyclic polymers in chemistry is continuously expanding into fields of mathematics, physics, and biology. Also, improvements and designs for new synthetic processes can help to develop novel cyclic polymers consisting of various monomer units and bringing about further innovations in numerous research fields. In this special issue, we would like to introduce cutting-edge research on cyclic polymers in a variety of research fields. Editors: ISODA, ISHIWARI, IDA, and MASHITA

Digest for English Readers

640

Hot Topics in Polymer Science in SPSJ

643

Awards for Encouragement of Research in Polymer Science; The Society of Polymer Science, Japan 2020

Commentary

Never-Ending Story by Enchanting Cyclic Polymers

Yasuyuki TEZUKA

644

COVER STORY: Highlight Reviews

Polymers with Various Topologies and Physics	Tetsuo DEGUCHI	645
Efficient Construction of Cyclic Polymers Enabled by Precise Polymerization and Cyclizations	Yoshinobu MATO, Takuya ISONO, Toshifumi SATOH	649

PolyMANGA

652

COVER STORY: Topics and Products

Ring-Expansion “Vinyl” Polymerization	Atsushi NARUMI	653
Linear/Cyclic Topology Transformation of Polymers	Kazuko NAKAZONO	655
Mathematical Analysis of the Topology of Cyclic Polymers	Koya SHIMOKAWA	657
Rolling Circle Translation of Circular RNA	Yuko NAKASHIMA, Kosuke FUKUCHI, Naoko ABE, Hiroshi ABE	659

Polymer Science and I: A Personal Account

Live by What You Love

Hiroaki IMOTO

661

Messages: “Work and Life”

Gratitude to Circumstances

Arihiro KANAZAWA

662

Front-Line Polymer Science

Recent Development in Separation, Purification, and Characterization of Ring Polymers

Atsushi TAKANO

663

Messages from SPSJ

668

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