A thermo-rheological study on the structure property relationships in the reinforcement of nylon 6–POSS blends
A thermo-rheological study on the structure property relationships in the reinforcement of nylon 6–POSS blends
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DOI：
10.1016/j.polymer.2013.12.003
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发表时间：
2014-02
期刊：
影响因子：
4.6
通讯作者：
R. Andrade;R. Huang;Matthew M. Herbert;Daniel V. A. Chiaretti;H. Ishida;D. Schiraldi;J. Maia
中科院分区：
文献类型：
--
作者：
R. Andrade;R. Huang;Matthew M. Herbert;Daniel V. A. Chiaretti;H. Ishida;D. Schiraldi;J. Maia
制备了尼龙6与一种硅氧烷添加剂氨基丙基异丁基POSS （APOSS）共混物，其POSS重量为0-5%。我们之前已经证明，APOSS在超过约3%重量浓度时是一种无效的添加剂，缺乏溶解度和与聚合物基质的良好相互作用。在熔融纺丝诱导的极端约束和取向条件下，APOSS可能会被强制组装成细长的钢筋状钢筋结构。在本研究中，我们通过WAXS， DSC和拉曼光谱测量了这些体系的结构-性能关系，结果表明分子相互作用没有引起化学结构的重大变化，但对APOSS-聚合物体系的流变学和SEM研究表明，在高于APOSS熔点的温度下，溶解性和分散性略有增强。我们还表明，两个条件似乎是改善性能所必需的：i)系统中需要存在足够浓度的APOSS，以便在重熔时大量扩散到基体中；ii)剩余的未扩散的APOSS团聚体需要低于直径约4 μm的临界尺寸，而当浓度超过约3%时则不会发生这种情况。
Blends of nylon 6 and a silsesquioxane additive, aminopropyl isobutyl POSS (APOSS) were prepared containing 0–5% POSS by weight. APOSS was previously demonstrated by us to be an ineffectual additive at concentrations of more than approximately 3% by weight, lacking solubility and favorable interactions with the polymer matrix. Significant reinforcement was only obtained under the extreme confinement and orientation conditions induced by melt-spinning, under which it was suggested the APOSS might undergo forced-assembly into elongated, rebar-like reinforcement structures.In the present work, we show that while the structure–property relationships of these systems, measured by WAXS, DSC and Raman spectroscopy revealed there are no major changes in the chemical structure induced by molecular interactions, rheological and SEM investigations on the APOSS-polymer systems suggest that at temperatures above the APOSS melting point, solubility and dispersion is slightly enhanced. We also show that two conditions seem to be necessary for improvement of properties: i) A sufficient concentration of APOSS needs to exist in the system to diffuse in significant quantities into the matrix upon re-melting; ii) The remaining non-diffused APOSS agglomerates need to be below a critical size around 4 μm in diameter, which does not happen for concentrations above approximately 3%.