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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and Properties of New Novolacs Based onHeteroatom-Bridged Phenol Derivatives
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Synthesis and Properties of New Novolacs Based onHeteroatom-Bridged Phenol Derivatives

机译：基于杂原子桥联苯酚衍生物的新型酚醛清漆的合成与性能

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We describe the synthesis and properties ofnew novolacs prepared by addition-condensation of hetero-atom-bridged phenol derivatives and formaldehyde. Thetrifluoroacetic acid-catalyzed polymerization of equimolaramounts of bis(4-methoxyphenyl) ether (1a) and formalde-hyde proceeded homogeneously to afford the polymer (2a)in 49% yield (M_n 2600, M_w/M_n 1.8). From the FTIR, ~1H-NMR, and ~(13)C-NMR spectra of2a,it was evident that thepolymer had methylene moieties-bridged repeating unitsin the polymer backbone. A higher molecular weightnovolac (2a) (yield 99%, M_n 16,600, M_w/M_n 12.9) could be merization of bis(4-hydroxyphenyl) sulfone (1c) did notproceed, even when it was attempted under various reac-tion conditions. From TGA, the temperatures at 10% lossin weight (T_(10)) for2a,2a',and2bwere found to be 413,430 and 393°C, respectively. These results suggested thatheteroatom-bridged novolacs based on phenol derivativeshave good thermal stability than other organosoluble poly-mers; moreover, these novolacs could be expected to func-tion as processable materials, polymer blends forengineering plastics, etc.
机译：我们描述了通过杂原子桥接的苯酚衍生物和甲醛的加成缩合制备的新型酚醛清漆的合成和性能。等摩尔量的双（4-甲氧基苯基）醚（1a）和甲醛缩合物的三氟乙酸催化聚合以49％的收率均匀地得到聚合物（2a）（M_n 2600，M_w / M_n 1.8）。从2a的FTIR，〜1H-NMR和〜（13）C-NMR光谱可知，该聚合物在聚合物主链中具有亚甲基部分桥连的重复单元。较高分子量的novolac（2a）（收率99％，M_n 16,600，M_w / M_n 12.9）可能不会发生双（4-羟苯基）砜（1c）的合并反应，即使在各种反应条件下进行了尝试也是如此。根据TGA，发现2a，2a'和2b的失重10％（T_（10））时的温度分别为413,430和393°C。这些结果表明，基于苯酚衍生物的杂原子桥接酚醛清漆具有比其他有机可溶性聚合物更好的热稳定性。此外，这些酚醛清漆有望用作可加工材料，工程塑料的聚合物共混物等。

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