TWISTING OF LAMELLAR CRYSTALS IN POLY(3-HYDROXYBUTYRATE-CO-3-HYDROXYXALERATE) RING-BANDED SPHERULITES
Ring-banded spherulites, as representative morphological feature of polymer crystalline aggregates, have been attracting considerable attention for fifty years. It is generally believed that the formation of ring-banded spherulites is attributed to the periodical lamellar twisting along the radial growth direction of the spherulites1,2. The origin of the twist of lamellar crystals has recently been intensively reviewed by Lotz and Cheng3. Although ring-banded spherulites have been widely investigated over the years, analyzing the origin of lamellar twist in ring-banded spherulites remains a challenge because the mere observation of the building lamellae in such complex threedimensional entities is a difficult task. Major contributions to the observation of the internal structure of spherulites had to await the development by Olley et al.4 of permanganic acid and potassium hydroxide etching technique. Organ et al.5 etched PHB spherulites by suspending samples in methylamine aqueous solution. The etching techniques mentioned above are useful, but more mild etching technique is needed to provide more clear observation for the lamellar shape and organization within the spherulites. In this work, using methylamine vapor etching technique, the growth of poly(3hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) ringbanded spherulites was studied and the distinct periodical cooperative lamellae twisting in the ringbanded spherulites was reported.
Zonpbao Wang Ya Li Jian Yang Quting Gou Qun Gu
Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R.China
国际会议
PP’2010，Jinan International Symposium on Polymer Physics(2010济南国际高分子物理学术研讨会)
济南
英文
199-200
2010-06-06（万方平台首次上网日期，不代表论文的发表时间）