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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of hydroxyapatite/poly(vinyl alcohol) composite fibers by wet spinning and their characterization
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Preparation of hydroxyapatite/poly(vinyl alcohol) composite fibers by wet spinning and their characterization

机译：湿法纺丝制备羟磷灰石/聚乙烯醇复合纤维及其表征

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摘要

To prepare hydroxyapatite (HA)/poly(vinyl alcohol) (PVA) composite fibers with high processibility applicable to various biomedical fields, HA/PVA composite powders were synthesized through a coprecipitation method and then mixed with pure PVA in dimethyl sulfoxide at 90 degrees C for 2 h to prepare wet-spinning dopes. HA/PVA solutions with HA contents of 0, 1, 3, 5, 10, and 15 wt % were analyzed with a rheometer to elucidate the effect of HA particles on the shear viscosities of the spinning dopes. The spinning dopes with pure PVA and an HA/PVA concentration of 12 wt % showed non-Newtonian flow behaviors, and as the HA content increased from I to 15 wt %, the shear viscosities increased simultaneously because of the complex formation between PVA chains, citric acid, and HA particles acting as crosslinkers. The increased viscosities of the spinning dopes diminished the breakage of PVA fibers and enhanced the spinnability. Through the addition of citric acid interacting with both PVA and HA particles, the aggregation of HA particles was suppressed, and it was possible to prepare HA/PVA composite fibers with smooth surfaces. An adequate amount of HA in the PVA fibers improved the thermal and mechanical properties of the fibers because uniformly dispersed HA particles interacting with PVA chains through hydrogen bonding in the PVA matrix complemented the structural defects. (c) 2007 Wiley Periodicals, Inc.
机译：为了制备具有高可加工性的羟基磷灰石（HA）/聚乙烯醇（PVA）复合纤维，以适用于各种生物医学领域，通过共沉淀法合成HA / PVA复合粉末，然后将其与纯PVA在90°C的二甲亚砜中混合2小时以制备湿纺原液。用流变仪分析HA含量为0、1、3、5、10和15 wt％的HA / PVA溶液，以阐明HA颗粒对纺丝原液的剪切粘度的影响。纯PVA和HA / PVA浓度为12 wt％的纺丝原液显示出非牛顿流动行为，并且随着HA含量从I增加到15 wt％，由于PVA链之间形成复杂的复合体，剪切粘度同时增加，柠檬酸和HA颗粒作为交联剂。纺丝原液的粘度增加减少了PVA纤维的断裂并增强了可纺性。通过添加与PVA和HA颗粒相互作用的柠檬酸，抑制了HA颗粒的聚集，并且可以制备具有光滑表面的HA / PVA复合纤维。 PVA纤维中足够量的HA改善了纤维的热和机械性能，因为均匀分散的HA颗粒通过PVA基质中的氢键与PVA链相互作用，从而弥补了结构缺陷。 （c）2007年Wiley Periodicals，Inc.

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