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Modification of poly(vinyl chloride). XXXIII. Novel poly(vinyl chloride) foam crosslinked with 6‐dibutylamino‐1,3,5‐triazine‐2,4‐dithiol
Author(s) -
Mori Kunio,
Nakamura Yoshiro,
Tamura Kosaku
Publication year - 1978
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1978.070220924
Subject(s) - blowing agent , vinyl chloride , materials science , stearate , dithiol , triazine , polymer chemistry , chloride , chemical engineering , composite material , chemistry , organic chemistry , polyurethane , copolymer , polymer , engineering , metallurgy
The formulation for producing the PVC foam crosslinked with a novel crosslinking agent such as 6‐dibutylamino‐1,3,5‐triazine‐2,4‐dithiol (DB) was studied to determine the processing conditions. DB was almost consumed by radical combination with a coexistent blowing agent such as azobisformamide to give a high‐density foam with excessively low crosslinking density. Blowing agents such as p ‐toluenesulfonylhydrazide (TSH) and 4,4′‐oxybis(benzenesulfonylhydrazide) (OBSH) gave a crosslinked foam of low density, while a combination of the two crosslinking agents had moderate crosslinking reaction rate. The formulation recommended in the present study consists of PVC Zeon 101EP or Zeon 121 for paste, 100 parts; DOP, 100 parts; DB, 3–5 parts; OBSH or TSH, 10 parts; MgO, 1–3 parts; and RP101 (mixture of Ba, Ca, and Zn stearate), 2 parts, which gave colorless and insoluble foam of apparent density 0.14 under hot pressing at 180°C. The molded foam could be released without extraction of heat from a hot mold for fusion and expansion.