STUDY OF HIGH TEMPERATURE RESISTANT SiC(Al) FIBERS PRECURSOR——POLYALUMINOCARBOSILANE FIBERS

ZHENG Chunman; LI Xiaodong; YU Yuxi; Wang Hao; CAO Feng; ZHAO Dafang

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STUDY OF HIGH TEMPERATURE RESISTANT SiC(Al) FIBERS PRECURSOR——POLYALUMINOCARBOSILANE FIBERS

Research Article | 更新时间：2021-03-19

- STUDY OF HIGH TEMPERATURE RESISTANT SiC(Al) FIBERS PRECURSOR——POLYALUMINOCARBOSILANE FIBERS
- Acta Polymerica Sinica Issue 6, Pages: 768-773(2006)
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- Published：20 September 2006，
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ZHENG Chunman, LI Xiaodong, YU Yuxi, Wang Hao, CAO Feng, ZHAO Dafang. STUDY OF HIGH TEMPERATURE RESISTANT SiC(Al) FIBERS PRECURSOR——POLYALUMINOCARBOSILANE FIBERS. [J]. Acta Polymerica Sinica (6):768-773(2006)
DOI：

ZHENG Chunman, LI Xiaodong, YU Yuxi, Wang Hao, CAO Feng, ZHAO Dafang. STUDY OF HIGH TEMPERATURE RESISTANT SiC(Al) FIBERS PRECURSOR——POLYALUMINOCARBOSILANE FIBERS. [J]. Acta Polymerica Sinica (6):768-773(2006) DOI：

摘要

以聚硅碳硅烷(PSCS)与乙酰丙酮铝(Al(AcAc)3)为原料

在常压高温条件下反应制备出聚铝碳硅烷(PACS)

经过熔融纺丝制备了PACS纤维.应用GPC、IR、XPS、29Si-NMR、27Al-NMR、TG、SEM、元素分析和增重等一系列分析

分别对PACS纤维的微观组成、结构以及性能进行了分析.研究结果表明

以原料质量配比为6∶100(Al(AcAc)3∶PSCS)合成的PACS化学式为SiC2.0H7.5O0.13Al0.018

数均分子量为1700左右

最适宜制备PACS纤维;PACS纤维中主要存在SiC4、SiC3H等结构

同时存在Si—O—Al键;在氮气气氛中

PACS纤维的陶瓷产率达到52%左右;预氧化处理

PACS纤维中Si—H键与空气中的氧反应形成Si—O—Si交联结构

较聚碳硅烷(PCS)纤维易于氧化

经过预氧化的PACS纤维陶瓷产率达到80%左右

是制备耐超高温SiC(Al)陶瓷纤维的合适纤维;用预氧化PACS纤维制备的SiC(OAl)纤维和SiC(Al)纤维抗拉强度高

耐高温性能好.

Abstract

Polyaluminocarbosilane(PACS) was synthesized by reaction of polysilocarbonsilane(PSCS)with Al- (AcAc)3

(AcAc：acetylacetonate)at normal pressure and high temperature

then PACS fibers were prepared through melt spinning of PACS．The composition and structure of PACS fibers were examined by measurements of element analysis

GPC

XPs

29Si-Solid NMR and27Al一Solid NMR；the properties of PACS fibers were studied by TG

weight gain and SEM．PACS synthesiznd through the reaction of AI(AcAc)3 with PSCS by mass ratio of 6：100 was best fitting for preparing PACS fibers．Its empirical formula was SiC2.0 H7.5O0.13Al0.018 and the molecular weight was about l700．The chemical structure unit included SiC4

SiC3H etc

and si—O—A1 bonds also existed in the PACS fibers．Under nitrogen atmosphere

the ceramic yield of PACS fibers was about 52％；during the curing process of PACS fibers in air．the Si--H bond reacted with oxygen

and Si—O—Si bond was formed．The ceramic yield of cured PACS fibers was about 80％ and the properties of SiC(OA1)and SiC(A1)ceramic fibers were excellent．It was proved that PACS fibers were very fitting for making SiC(OA1) and SiC(A1)ceramic fibers．

关键词

聚铝碳硅烷SiC纤维制备耐高温预氧化

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