期刊論文

標題 Studies on the self-assembly of neat DBS and DBS/PPG organogels
學年 98
學期 1
出版(發表)日期 2010/01/01
作品名稱 Studies on the self-assembly of neat DBS and DBS/PPG organogels
作品名稱(其他語言)
著者 Lai, Wei-Chi; Wu, Chia-Hui
單位 淡江大學化學工程與材料工程學系
出版者 Hoboken: John Wiley & Sons, Inc.
著錄名稱、卷期、頁數 Journal of Applied Polymer Science 115(2), pp.1113-1119
摘要 The self-assembly behavior of neat 1,3:2,4-dibenzylidene-d-sorbitol (DBS) and DBS/poly(propylene glycol) (PPG) organogels has been investigated by scanning electron microscopy, polarizing optical microscopy, and rheological measurements. DBS molecules are capable of self-organizing into fibrils and exhibit the birefringent spherulitic textures during cooling from the melt. On the other hand, DBS can self-assemble into a fibrillar network in PPG to produce organogels. DBS/PPG organogels also reveal a spherulite-like morphology. When a small amount of DBS is dispersed into a PPG matrix, we find that the spherulite sizes are much smaller than those of neat DBS. This is because the dilution of DBS causes DBS to self-assemble in PPG at a lower temperature. Therefore, more nucleation sites and smaller spherulite sizes are found in the DBS/PPG organogel system. The rheological measurements demonstrate that the elastic modulus (G′) in DBS/PPG organogels increases as the DBS concentration increases. However, the increase in G′ is less obvious, as the DBS content exceeds 3 wt %. suggesting that the DBS networks become saturated. Also, it is found that these organogels require a certain period of time to reach thermodynamic equilibrium, depending on DBS concentrations.
關鍵字 self-assembly; gels; spherulite
語言 英文
ISSN 0021-8995; 1097-4628
期刊性質 國外
收錄於 SCI;EI
產學合作
通訊作者 Lai, Wei-Chi
審稿制度
國別 美國
公開徵稿
出版型式 紙本