different sources. The linear oligo-(3-HB) derivatives also served as a model with respect to the physical properties of high molecular weight P(3-HB) and were investigated as such by transmission electron microscopy (TEM) and by small- and wide-angle X-ray scattering (SAXS and WAXS). The thicknesses of the lamellar crystallites (long periods) formed by the 8mer, 16mer, and 32mer, are ca. 26, 52, and 53 Å,
用
六甲基二硅氮烷锂(L
HMDS)在THF中于-70°重复处理
生物聚合物P(3-HB)(分子量> 10 5道尔顿,储存或s -P(3-HB)),导致形成低聚物混合物在15、30和45聚体周围分布越来越尖锐。当在纯净的Et 3 N中在回流(89°)下加热P(3-HB)时,也会分离出离散的片段。线性oligo(3-HB)衍
生物(3-7使用指数片段偶联策略合成最多包含96个3-HB单元的)。这些低聚物用于校准尺寸排阻色谱柱,以分析来自不同来源的寡(3-HB)样品。线性低聚物(3-HB)衍
生物还用作高分子量P(3-HB)物理性质的模型,并通过透射电子显微镜(
TEM)以及小型和宽型显微镜进行了研究。角X射线散射(
SAXS和WAXS)。由8mer,16mer和32mer形成的层状微晶(长周期)的厚度约为。26、52和53分别表示32mer分子非常紧密地折叠成“发夹”型构象。以类似方式结晶的高分子量P(3