A simple method was developed to realize a self-assembled block copolymer (BCP) lamellar microdomain morphology with a full pitch of 5.4 nm through an acid hydrolysis of poly(solketal methacrylate-b-styrene) (PSM-b-PS). The acid hydrolysis transforms PSM-b-PS, having two hydrophobic blocks, into poly(glycerol monomethacrylate-b-styrene) (PGM-b-PS), having one hydrophilic and one hydrophobic block. This transformation markedly increases the segmental interaction parameter such that a phase-mixed PSM-b-PS can be transformed in the solid state into a microphase-separated BCP without the use of any additives. Correlation hole scattering of the PSM-b-PS in the phase mixed state yields a segmental interaction parameter (χ) given by χ = 0.0196 + 4.694/T, where T is the absolute temperature. With the symmetric BCPs used in this study, the ordered lamellar microdomain pitch was determined by small-angle X-ray scattering (SAXS) as a function of the degree of polymerization (16 ≤ N ≤ 1246). For the lamellar microdomains of PGM-b-PS, the scattering profiles show many higher order reflections with an increase in the domain spacing (L₀). The lowest molar mass sample (M_n = 2200 g/mol, N = 16) had sub-3 nm microdomains after conversion to PGM-b-PS.

中文翻译：

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通过固态转换实现5.4 nm全节距层状微区

开发了一种简单的方法，通过对聚（缩酮甲基丙烯酸酯-b-苯乙烯）（PSM- b -PS）进行酸水解，可以实现节距为5.4 nm的自组装嵌段共聚物（BCP）层状微区形态。酸水解将具有两个疏水性嵌段的PSM- b- PS转变为具有一个亲水性嵌段和一个疏水性嵌段的聚（单甲基丙烯酸甘油酯-b-苯乙烯）（PGM- b- PS）。该转变显着增加了段相互作用参数，使得相混合的PSM- b - PS可以在固态下转变为微相分离的BCP，而无需使用任何添加剂。PSM- b的相关孔散射相混合状态下的-PS产生一个段相互作用参数（χ），由χ= 0.0196 + 4.694 / T给出，其中T为绝对温度。与本研究中使用的对称过境点，所述有序微区层状间距通过小角X射线散射（SAXS）的聚合度（16≤的函数来确定Ñ ≤1246）。对于PGM- b -PS的层状微区，散射轮廓显示出许多更高阶的反射，且畴间距（L ₀）增大。转化为PGM- b -PS后，最低摩尔质量样品（M _n = 2200 g / mol，N = 16）具有亚3 nm的微区。