It is mainly synthesized by two chemical ways: ring-opening polymerization and direct polycondensation.

1、

The N-methyl-2-pyrrolidone is chosen as polycondensation media and toluene as carrier of water.

选择N - 甲基 -2- 吡咯烷酮为反应介质,甲苯为带水剂.

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2、

Staring from D , Llactic acid , poly ( DLlactic acid ) ( PDLLA ) was directly synthesized through melt polycondensation.

以DL- 乳酸为原料, 通过熔融聚合法直接合成外消旋聚乳酸 (PDLLA).

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3、

The shaft seal leakage, judgement and emergency measures of the final polycondensation reactor was introduced.

介绍了终缩聚反应器轴封泄漏的现象、判断和应急措施.

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4、

The esterification, polyesterification , polycondensation and the formation of diethylene glycol ( DEG ) reaction kinetic parameters were obtained.

获得了酯化反应、酯化缩合反应、缩聚反应以及二甘醇生成反应的动力学参数.

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5、

The key equipment in polycondensation phase of non-phosgene process was emphatically introduced.

同时,介绍了非光气法缩聚阶段的关键设备.

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6、

A new mounting technology for synthetic diamond polycrystal-cubic anvil high-pressure technology is developed.

提出一种人造聚晶金刚石镶套新工艺———六面顶高压镶套工艺.

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7、

The present invention introduces transparent polycrystal used as luminous panel substrate in CRT.

本发明介绍用透明多晶体作阴极射线管发光面板的基片.

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8、

Infrared polycrystal optical materials ZnS were manufactured using chemical vapor deposition ( CVD ) method in this paper.

采用化学气相沉积方法成功地生长出硫化锌多晶红外光学材料.

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9、

With the polycrystal, PbI _ 2 single crystal with size of? 15 mm ×30 mm has been grown by vertical Bridgman method.

以此为原料,用垂直Bridgman法生长出尺寸为? 15mm×30mm的PbI2单晶锭.

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10、

Selected-area electron diffraction ( SAED ) confirmed that SnO 2 nanorods are polycrystalline.

选区电子衍射证实了SnO2是多晶态.

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11、

Invisible braces are made of translucent polycrystalline alumina ( TPA ).

隐形牙套的材料是半透明多晶体氧化铝 ( TPA ).

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12、

Lattice parameters are the important crystal structural parameters of polycrystalline materials.

晶胞参数是多晶材料晶体结构的重要参数.

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13、

Polycrystalline diamond coatings for tools are laid down using chemical vapor deposition.

工具用的复晶钻石涂层,则是使用化学气相沉积法制造的.

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14、

Polycrystalline diamond has many advantageous physical properties.

金刚石烧结体具有许多优异的物理机械性能.

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15、

Polycrystalline iron fiber is a novel magnetic material, which can be used widely in industry.

多晶铁纤维是一类新型磁性材料, 应用十分广泛.

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16、

Nowadays, the infection of quantum effects of polycrystalline silicon is also investigated.

近期, 多晶硅中量子效应对器件性能的影响也被研究.

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17、

Polycrystalline silicon is an aggregation of small silicon crystals.

多晶硅是细小硅晶的集合体.

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18、

Transgranular fracture. Fracture of polycrystalline materials by crack propagation through the grains.

多晶材料裂纹穿过晶粒扩展而断裂.

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19、

Intergranular fracture. Fracture of polycrystalline materials by crack propagation along grain boundaries.

多晶材料裂纹沿着晶界扩展而断裂.

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20、

Process of enhancing wear resistance of polycrystalline sintered compact has been studied.

研究了提高多晶烧结体耐磨性的方法.

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