Good thermal stability and self-extinguishing behavior was observed with the cured polybenzoxazine resins. Second, furan-containing benzoxazine monomers, P-FBz, BPA-FBz, and 4FP-FBz were prepared using furfurylamine as a raw material. Formation of furfurylamine Mannich bridge networks in the polymerizations of P-FBz and BPA-FBz increased the cross-linking densities and thermal stability of the resulting polybenzoxazines. P-FBz and BPA-FBz- based polymers also exhibited high glass transition temperatures above 300℃, high char yields, and low flammability with a limited oxygen index value of 31. The dielectric (Dk3.21–3.39) and mechanical properties (high storage modulus of 3.0–3.9 GPa and low coefficient of thermal expansion of 37.7– 45.4 ppm) of the P-FBz and BPA-FBz-based polymers were superior or comparable to other polybenzoxazines. 4FP-FBz used for polybenzo- xazine modification by means of formation of benzoxazine hybridation with P-FBz.

第二部份以2-呋喃甲胺為起始物，制備了P-FBzwww射com、4FP-FBz與BPA-FBz 三個(gè)含呋喃官能基之氧代氮代苯并環(huán)己烷的單體黄片大全三级片在线播放超清无码；BPA-FBz與P-FBz於開環(huán)聚合中形成之Mannich bridge網(wǎng)狀結(jié)構(gòu)有效地提升聚氧代氮代苯并環(huán)己烷聚合物之交聯(lián)密度與熱安定性；Poly與Poly具有大於300℃之玻璃轉(zhuǎn)移溫度黄色免费无码网知、高的焦炭生成率與具有31之極限氧指數(shù)(Limited oxygen index日韩精品嫩草网站在线播放， LOI)的難燃性特質(zhì)，Poly與Poly之介電常數(shù)(Dk=3.21~3.39)與機(jī)械性質(zhì)[3.0~3.9 GPa的儲(chǔ)存模數(shù)與37.7~45.4ppm之低熱膨脹系數(shù)( Low coefficient of thermal expansion免费无码漫画， Low CTE)]均較其他聚氧代氮代苯并環(huán)己烷為優(yōu)亚洲欧美另类在线综合第一页；4FP-FBz具有低之介電常數(shù)(Dk=2.7)，以其作為降低介電常數(shù)之反應(yīng)型改質(zhì)劑6719国产欧美在线，與P-FBz混成亚洲一级婬片A片在线看，證實(shí)可有效地降低Poly的介電常數(shù)。

It preparatorily discuss the relation between Heidegger'sthought and Aesthetics,consider the key to the ground and development of Aesthetics is the rela-tion between Truth and beauty.

第一部份是&導(dǎo)論&激情欧美色播，簡(jiǎn)單地亚洲美女视频黄不卡、準(zhǔn)備性地談了海氏思想與美學(xué)的關(guān)系，指出美學(xué)的建立與發(fā)展關(guān)鍵是解決美與真的關(guān)系轻点网站。