著者
Khunanya Janchai 井上 貴博 岩崎 祥平 木田 拓充 山口 政之
出版者
一般社団法人 プラスチック成形加工学会
雑誌
成形加工 (ISSN:09154027)
巻号頁・発行日
vol.35, no.9, pp.318-323, 2023-08-20 (Released:2023-09-20)
参考文献数
38

We investigated the effect of shear history on the crystallization behavior of isotactic polypropylene (PP) containing a fibrous nucleating agent, i.e., 1, 3 : 2, 4-bis-o-(4-methylbenzylidene)-Dsorbitol (MDBS), using a polarized optical microscope attached with a parallel-plate shear device. The addition of MDBS greatly enhanced the crystallization temperature of PP with an accelerated crystallization rate. Although shear history applied during cooling barely affected the crystallization temperature for the sample containing MDBS, it greatly enhanced the PP orientation, even with a low shear rate. This was attributed to the formation of a pseudo shish-kebab structure, in which MDBS acted as the shish. It was also found that the addition of MDBS reduced the amount of β -form crystals, while PP without MDBS exhibited β -form crystals after applying an appropriate shear history.
著者
二瀬 克規
出版者
一般社団法人 プラスチック成形加工学会
雑誌
成形加工 (ISSN:09154027)
巻号頁・発行日
vol.13, no.10, pp.660-664, 2001-10-20 (Released:2022-02-01)
参考文献数
9
被引用文献数
2
著者
網野 直也
出版者
一般社団法人 プラスチック成形加工学会
雑誌
成形加工 (ISSN:09154027)
巻号頁・発行日
vol.30, no.4, pp.150-154, 2018-03-20 (Released:2020-08-25)
参考文献数
35
著者
池上 和志
出版者
一般社団法人 プラスチック成形加工学会
雑誌
成形加工 (ISSN:09154027)
巻号頁・発行日
vol.32, no.6, pp.202-205, 2020-05-20 (Released:2020-06-20)
参考文献数
6
著者
西川 理穂 山口 政之
出版者
一般社団法人 プラスチック成形加工学会
雑誌
成形加工 (ISSN:09154027)
巻号頁・発行日
vol.34, no.1, pp.25-28, 2021-12-20 (Released:2022-01-22)
参考文献数
17

We investigated the structure and properties of extruded high-density polyethylene (HDPE) containing 03. wt.% of multi-walled carbon nanotubes (CNTs). It was found from differential scanning calorimetry measurements that the CNT addition raised the crystallization temperature of HDPE, suggesting that CNT acts as a nucleating agent for HDPE. Furthermore, two-dimensional X-ray diffraction measurements revealed that the CNT addition greatly enhanced the chain orientation of HDPE in the extruded strand, which was pronounced by melt-stretching after passing through the die. CNTs orientated parallel to the flow direction behave like extended chain crystals, and thus accelerate the formation of shish-kebab structure. As a result, the tensile modulus was enhanced by the CNT addition, which was pronounced especially in the high temperature region.