玻璃化

As the vitrification transition temperature of the phthalazine polyether-sulfone-ketone is high, the prepared ultrafiltration membrane has the performances of high temperature resistance and solvent-resistance.

二氮杂萘聚醚砜酮类聚合物的玻璃化转变温度高，所制备得到的超滤膜具有耐高温，耐溶剂性能。

Polyimide films capped with nonreactive phthalimide end groups were synthesized with theoretical number average molecular mass of 10000 and 30000 calculated using the Carothers equation. The effect of end-capper on the thermal properties was studied by investigating the change of the glass transition temperature T(subscript g of films after cured at high temperature.

制备了经邻苯二甲酸酐封端的理论数均分子量为10000和30000的聚酰亚胺薄膜，通过差示扫描热分析测定薄膜高温热处理前后玻璃化温度的变化，研究了PA封端对ODPA/ODA聚酰亚胺薄膜热稳定性能的影响。

Results showed that: it aggravates the extent of protocorm vitrification with the increase of hormone concentration and the expansion of subculture time.

结果表明，随着植物生长调节剂浓度增高和继代培养的时间延长，类原球茎玻璃化程度加重。

The reproduction ability and plant regeneration rate was lower distinctly than formal protocorm.

玻璃化类原球茎的平均增殖率仅为2.2，再生植株率为183株／瓶，明显低于正常类原球茎的5.3和1297株／瓶。

The results showed that intermidiate 1, 2-propanediol-sebacate of low relative molecular mass was synthesized with toluene-p-sulfoinc acid as catalyst, benzene as watercarrying agent, and of mole ratio of sebacic acid to 1, 2-propanediol of 1:4. The glass-transition temperatures of PPSC were below 0 ℃ which confirmed that PPSC would be in a high-elastic state of ambient temperature and human body temperature. PPSC was a elastomer with moderate crosslinkage, low module and high elongation, and had rapid degradation ratio (degradation degree more than 50%) in phosphate (pH value 7.4) at 37℃.

结果表明，以对甲苯磺酸为催化剂、苯为带水剂，在酸醇比为1，4的条件下可合成较低相对分子质量的中间体癸二酸聚酯二元醇；PPSC弹性体的玻璃化转变温度在0℃以下，于室温及人体温度下处于高弹态；PPSC为适度交联的、低模量高伸长的弹性体，其在37℃、pH值为7.4的磷酸盆缓冲溶液中具有较快的降解性（降解度超过50%）。

Cold crystallization process of N-(1-naphthyl) succinimide below glass transition temperature was monitored by differential scanning calorimetry and X-ray diffraction.

采用x射线粉末衍射和差示扫描量热分析方法，跟踪研究了N-（1-萘基）琥珀酰亚胺的液氮淬冷样品在室温(25℃)即在玻璃化转变温度以下的冷结晶行为。

The result indicated that we can get stable homopolymer and copolymer emulsion with uniform size distribution, when the ratio of sodium polyether sulfovinate modified polysiloxane to sodium lauryl sulfate was two, the quantity of the emulsifiers ranged from 6% to 8%, the quantity of initiator ranged from 0.4% to 0.8%, the stirring speed ranged from 200rpm to 250rpm, the polymerization temperature was 80 centigrade degree. As for the copolymer emulsion, the more the TRIS content in the monomers, the larger the water contact angle of their films became, namely, the surface energy of the copolymer films increased with the TRIS content in the monomers. In addition, the glass-transition temperature of the copolymers ranged from high temperature region to low temperature region with the increasing of TRIS content in the monomers.

结果表明：当乳化剂用量在6%～8%、改性乳化剂与十二烷基硫酸钠复配比为2：1、引发剂用量在0.4～0.8%、聚合温度为80℃、搅拌速度在200～250rpm时，得到的均聚物和共聚物乳液稳定，而且粒径分布均匀；对于共聚物乳液来说，随着单体中TRIS含量的增加，所得聚合物膜的水滴接触角增加，即其表面能增加：另外，随着共聚单体中TRIS含量的增加，共聚物的玻璃化转变温度从PMMA的Tg的高温区向PTRIS的Tg的低温区移动。

A method for direct determination of Cu, Pb, Zn, S, Mg and As in copper sulphide concentrates by Axios PW4400 wavelength dispersive X-ray fluorescence spectrometer using lithium metaborate-lithium tetraborate fusion sample preparation method has been developed.

采用偏硼酸锂和四硼酸锂混合熔剂熔融法制样，波长色散X射线荧光光谱法测定铜精矿中铜、铅、锌、硫、镁、砷，考察了熔剂、玻璃化试剂和预氧化条件对制样的影响。

Disclosed is a polyimide resin having a glass transition temperature of 200-320 DEG C and containing a siloxane diamine residue, a fluorene diamine residue and a specific tetracarboxylic acid dianhydride residue at certain ratios.

本发明提供玻璃化转变温度为200～320℃，以特定比例含有硅氧烷系二胺残基、芴系二胺残基和特定四羧酸二酐残基的聚酰亚胺树脂。

With the increase of content of triamine monomer, the mechanical property of polyimide foams is improved, and the glass transition temperature of polyimide foams increases.

随着三胺单体含量的增加，聚酰亚胺泡沫材料的力学性能和玻璃化转变温度得到提高。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。