私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

相關鏈接
聯系方式
  • 通信地址:重慶市北碚區天生路2號
  • 郵編:400715
  • 電話:18580254939
  • 傳真:
  • Email:jbzeng@swu.edu.cn
當前位置:> 首頁 > 最新動態 > 正文
Macromolecules: 蓖麻油基聚氨酯脲動態共價鍵交聯網絡

Title:Sustainable, Malleable, and Recyclable Castor Oil-Derived Poly(urethane urea) Networks with Tunable Mechanical Properties and Shape Memory Performance Based on Dynamic Piperazine?Urea Bonds

Abstract:Castor oil (CO)-derived polyurethanes (PUs), denoted CPUs, are drastically limited because they cannot be reprocessed, reshaped, or recycled and because they show low strength, poor toughness, and insufficient functionality due to their permanently cross-linked structure with a high cross-link density and a soft backbone. Herein, we developed novel reversible piperazine?urea bonds (PaUBs) from inexpensive piperazines and isocyanates and incorporated the PaUBs into CPUs to fabricate sustainable and reprocessable poly(urethane urea) covalent adaptable networks (CANs). We synthesized the CANs from CO, N-(2-hydroxyethyl) piperazine (HEP), and 4-methylenedicyclohexyl diisocyanate (HMDI) via a catalyst- and solvent-free approach. The CANs showed variable tensile behavior over a wide range from a soft elastomer to tough and hard plastics. They also exhibited excellent malleability, stable reprocessability, and multiple recyclability, in which their original properties were recovered after several thermal recycling or remolding cycles. The CANs possessed excellent shape memory performance and reconfigurability, allowing them to be reprocessed into various complex shapes without using a mold. The advanced sustainable CANs based on dynamic PaUBs have great potential application as alternatives to traditional fossil-derived elastomers and plastics.

全文鏈接:https://pubs.acs.org/doi/10.1021/acs.macromol.2c00104

主站蜘蛛池模板: 盐源县| 邳州市| 醴陵市| 登封市| 霍林郭勒市| 郎溪县| 南岸区| 阿拉善左旗| 乳山市| 天长市| 郁南县| 长沙县| 农安县| 曲靖市| 定襄县| 长顺县| 霍州市| 宁陵县| 丹凤县| 凉山| 贵德县| 扶绥县| 开原市| 邯郸县| 阿图什市| 苏尼特左旗| 库尔勒市| 冕宁县| 来安县| 武汉市| 故城县| 从化市| 繁峙县| 金华市| 乐业县| 正镶白旗| 昌邑市| 革吉县| 洪泽县| 和平区| 昌邑市|