臺灣博碩士論文加值系統

本文以交鏈濕式紡絲法紡製的高強度、高係數聚乙烯醇纖維經不同縮醛化
溫度及時間處理後， 對其物性進行探討。 縮醛化溫度及時間分別為
40℃ ∼ 90℃ 、 3 分鐘 ∼ 120 分鐘。再針對不同縮醛化條件所紡製的
聚乙烯醇縮甲醛纖維，進行縮醛化度、染著量、吸水性、耐熱水性的測定
、動態機械性質及機械性質的分析， 並利用 X-ray 廣角繞射測量結晶度
與 X-ray 廣角照相， 以複立葉轉換紅外線光譜來觀察分子間亞甲基醚鍵
交鏈的存在。將聚乙烯醇縮甲醛纖維以硫酸進行酸處理，打斷分子間交鏈
，對於縮醛化處理過程中分子間交鏈含量的變化進行探討，並以聚乙烯醇
縮甲醛纖維在乙二胺溶液中的溶解程度來佐證。由實驗結果得知，當縮醛
化時間增加時，則縮醛化度、耐熱水性隨之增加，結晶度微降，玻璃轉位
點消失。耐熱水性隨縮醛化溫度的提高而增加，然後於 80℃ 後便下降。
結晶度則隨縮醛化溫度的提高而劇降。纖維經縮醛化處理後，其吸水性、
乾伸度、結節強度及彈性回復率下降，乾強度大約降低 5.2％，但乾濕強
度比提高至 96.3％。 在本文中，以交鏈濕式法紡製的聚乙烯醇縮甲醛纖
維具有極佳的耐熱水性， 在 100℃ 的熱水中加熱 10 小時僅收縮大約
1.0％。 而當縮醛化溫度超過 80℃時，因纖維的結晶區已受到破壞，反
而造成整個纖維的物性急劇下降。

In this study, the physical properties of high tenacity and
high modulus poly(vinyl alcohol) fibers by crosslinking
wet spinning under different formalized temperature and time
were studied. The formalized temperature and time ranged from
40℃ to 90℃ and 3 min to 120 min, respectively. Degree of
formalization , dye-uptake, water absorption, hot water
resistance and mechanical properties of formalized poly(
vinyl alcohol) fibers were studied under different
formalized conditions. The formalized poly(vinyl alcohol)
fibers were treated by sulfuric acid in order to break
intermolecular crosslinkage. The change of intermolecular
crosslinkage during formalized treatment was studied, and the
crystallinity was measured by utilized wide angle X-ray
diffraction method. The results indicated that the degree of
formalization and hot water resistance were increased as
the formalized time increased, but the crystallinity
decreased slightly, and also Tg peak disappeared. Hot water
resistance increased initially with the increasing of
formalized temperature, and then it decreased after over
80℃. The crystallinity decreased drastically with the
increasing of formalized temperature. After formalized
treatment, the water absorption, dry elongation, knot
tenacity and elastic recovery were decreased. Dry tenacity was
decreased about 5.2％, but wet/dry tenacity ratio was increased
to 96.3％. The formalized poly(vinyl alcohol) fibers had
excellent hot water resistance, the shrinkage was about
1.0％ when heated 10 hours in 100℃ water. When the formalized
temperature was above 80℃, the physical properties of
vinylon fibers decreased drastically, because the crystalline
region had been destroyed.