News
Industry Events
Home > News > Industry Events

Sensitive to pH advent of new thermosetting plastics

2016-01-22   admin    2512Click

Human made the good chemical stability of thermosetting plastics, but how did they become a problem recycling, such as thermosetting plastics sensitive than the decomposition temperature of its heat temperature is usually much higher. Therefore, scientists have been looking for solutions thermosetting plastics recovered problems.
       Recently, researchers at the IBM Almaden Research Center put forward a new idea: to create a new type of pH-sensitive thermosetting plastic which maintains superior performance plastics, and can be broken down into small molecules monomers under acidic conditions. , thus demonstrating the reversibility.
       Dr. Garcia and his team synthesized a nitrogen-containing heterocyclic polymer plastic: team synthesized under acidic conditions, nitrogen-containing heterocyclic polymer degradable plastic figure of each structure is a red and blue 135- hexahydro triazine.
       Garcia et al to use a polymerizable monomer having two amino paraformaldehyde at about 50 ℃ synthesized a hemiaminal covalent network structure, and then heating is continued to 200 ℃, hemiaminal formed dehydration the 135- hexahydro triazine and forming a crosslinking point, formation of high molecular structure of plastic. Containing heterocyclic triazine just hold each other's hand and not let go, the bond good thermal stability so that this new type of thermosetting plastic has good heat resistance. The experiments show that the plastic toughness than traditional nitrogen-based polymer plastic better.
       But the real point is that it break through the traditional pH sensitive reversibility of this new type of thermosetting plastic: Although it is not sensitive to temperature, but at a pH of less than 2, just after a simple decomposition reaction, a few hours after the make polymer decomposed into water and -diaminodiphenylether:
       pH-sensitive plastic produced 4'4 'of decomposition - diaminodiphenyl ether which can be used to produce polyimide (PEI) and polyester resin.
       Compared with the traditional reaction temperature, pH control by the benefits of this reaction is that energy consumption, easy to control the reaction. This reaction does not need to be heated to very high temperatures, does not require a long reaction chain. At the same time it kind of reaction products are also environmentally    friendly - diaminodiphenyl ether can be used as raw material for synthetic plastics to be used again, not to mention the water thus ensuring the recovery of the plastic will not bring any known environmental issues .
       In the invention of technological progress and at the same time, we also need to focus on the impact on the environment. This Garcia and her team invented a reversible pH-sensitive plastic is the concern of this. If the synthetic purity of this plastic can reach industrial production requirements, NA me plastic product impact on the environment is likely to be reduced. At the same time, since such thermosetting plastics having a higher toughness, its lifetime of plastic products may also be further improved, thereby indirectly reducing the plastic waste.

©2021 GOODALL ENGINEERING PLASTICS (SZ) CO., LTD. All Rights Reserved.

Powered By SEWA   

国产一级A片无码免费 另类人善交video 精品福利视频一区二区三区 黄色电影网址 西西大胆午夜视频无码
欧美在线看 亚洲精品AⅤ在线观看 丰满少妇一级毛片免费播放器 亚洲人成77777在线播放网站 久久亚洲 国产一级牲交高潮片 国产人成精品香港三级在线 天天摸夜夜添夜夜无码 黄色一级A片 色妺妺免费影院 亚洲国产精品第三页 岛国在线观看无码不卡 在线播放国产打屁股网站 亚洲AV福利无码无二区 夜夜视频 亚洲AV永久无码一区 正在播放极品白嫩一线天 中文字幕不卡av无码专线一本 日韩激情无码一级毛片免费 亚洲精品人成电影在线观看 日日噜噜夜夜狠狠免费视频 噗嗤噗嗤啊太深太粗视频 国产精品欧美一区二区三区 欧美成人极品资源在线观看 在线观看AV 国产丰满乱子伦无码专区 太大太粗太爽免费视频 亚洲大乳高潮日本专区 精品亚洲AV无码一区二区三区 九七色色 最新国产AV无码专区亚洲AV 日本在线播放www色鲁啊鲁 美女一级片 欧美成在线精品视频 中文成人无码精品久久久 小辣椒导航福利入口 中国熟妇 H动漫精品网站网址 免费av网址 无码专区视频中文字幕 黄片免费在线看 国产成人极品盛宴免费视频 午夜男女生活片牲交网站 免费一级A片在线观看 色吊丝国产永久免费 H无码精品动漫在线观看免费 黄色在线播放 3344国产在线观看 精品无码国产污污污 亚洲色中文字幕无码av