Control of reaction mechanisms in cationically polymerized epoxy resins facilitates the adjustment of morphology and mechanical properties
Control of reaction mechanisms in cationically polymerized epoxy resins facilitates the adjustment of morphology and mechanical properties
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控制阳离子聚合环氧树脂的反应机理有助于调整形态和机械性能
DOI：
10.1002/polb.24128
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
A. Hartwig
中科院分区：
文献类型：
--
作者：
A. Arnebold;F. Plander;K. Thiel;S. Wellmann;A. Hartwig
研究了不同形貌阳离子聚合环氧热固性树脂的结构与性能的关系。用带有不同数量羟基端基的星星形聚（ε-己内酯）（SPCL）进行无定形环氧基共聚物和部分结晶聚合物合金的形态调节。这些羟基因其在活化单体（AM）机制下对环氧化物的反应性而闻名。由于这个原因，合成了具有四个羟基端基（SPCL-四醇）的四臂SPCL，此外，还合成了具有四个酯端基（SPCL-四酯）的连续酯化的SPCL。带有较少或没有羟基端基的SPCL物质在环氧网络内分离成针状纳米结构域，并且如果浓度足够高，也分离成结晶结构域。与SPCL-四醇相比，SPCL-四酯在环氧网络内的更强的相分离是由于AM机理的减少。由不同形态产生的机械性能导致在更多相分离（和部分结晶）的聚合物合金的情况下较高的储能模量和Tg值与在无定形共聚物的情况下较高的断裂应变之间的权衡。然而，在这两种情况下，韧性得到改善或至少保持在与纯环氧树脂相同的水平。© 2016 Wiley Periodicals，Inc. J.波利姆科学，部分B：聚合物物理2016，54，2188-2199
Structure–property relations of cationically polymerized epoxy thermosets with different morphologies are examined. The morphology adjustment of amorphous epoxy based copolymers and partially crystalline polymer alloys is carried out with star‐shaped poly(ε‐caprolactone) (SPCL) bearing various numbers of hydroxyl end groups. These hydroxyl groups are known for their reactivity toward epoxides following the activated monomer (AM) mechanism. For this reason, four‐armed SPCL was synthesized with four hydroxyl end groups (SPCL‐tetraol) and, in addition, with successively esterified ones down to a SPCL with four ester end groups (SPCL‐tetraester). SPCL species bearing fewer or no hydroxyl end groups segregate into needle‐like nanodomains within the epoxy networks and, if the concentration is high enough, also into crystalline domains. The stronger phase separation of SPCL‐tetraester within the epoxy network compared with SPCL‐tetraol is due to a reduction of the AM mechanism. The mechanical properties resulting from different morphologies lead to a trade‐off between higher storage moduli andTgvalues in the case of the more phase separated (and partially crystalline) polymer alloys and higher strain at break in the case of the amorphous copolymers. Nevertheless, in both cases toughness is improved or at least kept on the same level as for the pure epoxy resin. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys.2016,54, 2188–2199
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影响因子：
3.9
作者：
Andre Arnebold;K. Thiel;E. Kentzinger;A. Hartwig
通讯作者：
Andre Arnebold;K. Thiel;E. Kentzinger;A. Hartwig
影响因子：
4.6
作者：
Arnebold, Andre;Hartwig, Andreas
通讯作者：
Hartwig, Andreas
橡胶增韧环氧树脂的结构与机械性能之间的关系
DOI：
--
发表时间：
1978
期刊：
影响因子：
--
作者：
C. Bucknall;Toshiya Yoshii
通讯作者：
Toshiya Yoshii
结晶度作为环氧树脂增韧的新概念：集成聚酯支化的影响
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
Arne Stra burg;Hendrik Lűtzen;A. Hartwig
通讯作者：
A. Hartwig
苄基锍盐热引发双环原酸酯阳离子聚合
DOI：
--
发表时间：
1985
期刊：
影响因子：
--
作者：
T. Endo;H. Uno
通讯作者：
H. Uno